NEWSLETTER 06+07/2021 15.07.2021
Pollerspöck, J. & Straube, N. 2021, Bibliography database of living/fossil sharks, rays and chimaeras (Chondrichthyes: Elasmobranchii, Holocephali), www.shark-references.com, World Wide Web electronic publication, Version 2021
NEWS/ OWN RESEARCH
OPEN ACCESS!STRAUBE, N.
& LYRA, M.L. & PAIJMANS, J.L.A. & PREICK, M. & BASLER, N. & PENNER, J. & RÖDEL, M.-O. & WESTBURY, M.V. & HADDAD, C.F.B. & BARLOW, A. & HOFREITER, M. (2021): Successful application of ancient DNA extraction and library construction protocols to museum wet collection specimens. Molecular Ecology Resources, in presshttps://onlinelibrary.wiley.com/doi/full/10.1111/1755-0998.13433
Abstract: Millions of scientific specimens are housed in museum collections, a large part of which are fluid preserved. The use of formaldehyde as fixative and subsequent storage in ethanol is especially common in ichthyology and herpetology. This type of preservation damages DNA and reduces the chance of successful retrieval of genetic data. We applied ancient DNA extraction and single stranded library construction protocols to a variety of vertebrate samples obtained from wet collections and of different ages. Our results show that almost all samples tested yielded endogenous DNA. Archival DNA extraction was successful across different tissue types as well as using small amounts of tissue. Conversion of archival DNA fragments into single-stranded libraries resulted in usable data even for samples with initially undetectable DNA amounts. Subsequent target capture approaches for mitochondrial DNA using homemade baits on a subset of 30 samples resulted in almost complete mitochondrial genome sequences in several instances. Thus, application of ancient DNA methodology makes wet collection specimens, including type material as well as rare, old or extinct species, accessible for genetic and genomic analyses. Our results, accompanied by detailed step-by-step protocols, are a large step forward to open the DNA archive of museum wet collections for scientific studies.
ADNET, S. & FEICHTINGER, I. & HARZHAUSER, M. & POLLERSPÖCK, J.
(2021) A mesopelagic selachian fauna from the middle Eocene of St. Pankraz (Austria) reveals homogeneity in deep-marine environments during the warm period in Europe. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 301 (1): 25-63 researchgate
Abstract: Repeated bulk sampling for over a decade in an indurated glauconitic sandy marl horizon at St. Pankraz Salzburg, Austria, has yielded a diverse assemblage of 37 elasmobranchs (sharks and rays) from the early middle Eocene (Lutetian). This elasmobranch fauna is dominated by epipelagic and mesopelagic taxa known today to preferentially inhabit the middle or outer continental shelf and upper slope, indicating that the depositional environment of the top Member of Kressenberg Formation in Austria has a more complex bathymetric history than previously thought. As these new occurrences fill a substantial gap in the sporadic fossil record of Eocene mesopelagic elasmobranchs, comparisons of this assemblage with the coeval mesopelagic faunas indicate that this northwestern Tethyan realm association shares considerable similarities with those recovered from the North Sea Basin and the northeastern Atlantic. This suggests that the faunal homogeneity observed in neritic and coastal elasmobranch communities during the warm early middle Eocene is also characterised in mesopelagic habitats.
New database report published by team shark-references!
- You want to know how many species of sharks, rays and chimaeras there are?
- You want to know the distribution of species among the orders or families?
- You want to know the references of the first descriptions?
- You want a list of all sharks, rays and chimaeras ever described with their synonyms?
Our new data report can answer all these questions for you!
Abstract: The table and provided download links below are intended for informational use in Chondrichthyan research. The allocation aims for faciliating to find species numbers and most recent information on taxonomic changes. We will regularly update the table and download links at lest twice annually. The updates will be announced on facebook (https://www.facebook.com/sharkreferences
) and in our monthly newsletter (sign up here: https://eepurl.com/sJNGb
). The Excel sheet allows for the application of individual filter- and sorting options. The list of described spsecies complements taxonomic information for the list of valid species by providing synonyms and / or new taxonomic combinations.
Our Co-Editor Nico was recently invited to join the the IUCN shark specialist group. We
are very happy about that and will support the IUCN and their work the best we can!
NEW PARTNERS OF SHARK-REFERENCES
Maria Cristina Oddone, Instituto de Ciências Biológicas, Universidade Federal de Rio Grande, Brasil sent me this two obituaries written in memory of professor Carolus Maria Vooren.
Obituary: Professor Carolus Maria Vooren (1941-2021).
Pan-American Journal of Aquatic Sciences, 16(1): 1-4.
OBITUÁRIO - CAROLUS MARIA VOOREN (14/11/1941-12/3/2021)
v. 54 n. 1 (2021): Arquivos de Ciências do Mar
Partner in Google-Maps:
Would you like to become a shark-reference partner? Please contact us per E-mail!
Many thanks to the following people for providing images:
Frederik Mollen (Elasmobranch Research Belgium) for the images of Carcharhinus albimarginatus
Spencer Lucas for some images of Dracopristis hoffmanorum HODNETT, GROGAN, LUND, LUCAS, SUAZO, ELLIOTT & PRUITT, 2021
Dr. Simon Weigmann, Elasmobranch Research Laboratory, Hamburg, Germany for a images of Etmopterus brosei, Acroteriobatus andysabini and Acroteriobatus stehmanni
Bryan Huerta for a image of Carcharhinus brevipinna, Carcharhinus isodon and Sphyrna tiburo
Adam Anderson for pics of Notorynchus primigenius, Chlamydoselachus keyesi, Gladioserratus aptiensis and Notidanodon lanceolatus
LOBODA, LASSO, ROSA & DE CARVALHO for an images of Paratrygon orinocensis and Paratrygon parvaspina
Iris Feichtinger and Viola Winkler, Wien for images of Cladodus gailensis
Gilles Cuny for a image of Triodus aeduorum
Md Jayedul Islam, Dhaka, Bangladesh for a image of Glaucostegus younholeei
Bianca S. Rangel, Institute of Biosciences, University of São Paulo for images of Pseudobatos horkelii
Many thanks to all friends of shark-references, who sent us some missing papers last month!
Shark-References would kindly like to ask you for your contribution to this project.
At the moment we are looking for some of the following papers:
MATSUMOTO, H. (1936) Upper Miocene vertebrates from Kumanodô, Natori district, province of Rikuzen. Dobutsugaku Zasshi, 48: 475–480, 5 fig.
ALVINERIE, J. & ANDREIEFF, P. & ANGLADA, R. & AUBERT, J. & CAPPETTA, H. & CARALP, M. & CARATINI, C. & CARBONNEL, G. & CATZIGRAS, F. & COURME-RAULT, M.-D. & CHATEAUNEUF, J.-J. & DEMARCQ, G. & DUCASSE, O. & FATTON, E. & GLAÇON, G. & LABRACHERIE, M. & LAURIAT, A. & LE CALVEZ, Y. & LORENZ, C. & MAGNE, J. & MARGEREL, J.-P. & POIGNANT, A. & PUJOL, C. & ROGER, J. & ROMAN, J. & BLONDEAU, A. & MULLER, C. (1973) A propos de la limite oligo-miocène: résultats préliminaires d'une recherche collective sur les gisements d'Escornébéou (Saint-Géours-de-Maremne, Landes, Aquitaine méridionale). Présence de Globigerinoides dans les faunes de l'Oligocène supérieur. Comptes rendus sommaires des séances de la Société géologique de France: 75–76
KAMOHARA, T. (1943) Some unrecorded and two new fishes from Prov. Tosa, Japan. Bulletin of the Biogeographical Society of Japan, 13 (17): 125–137
DE BUEN, F. (1950) Contribuciones a la Ictiología. II. El tiburón vitamínico de la costa uruguaya Galeorhinus vitaminicus nov. sp., y algunas consideraciones generales sobre su biología. Publicaciones Cientificas, Servicio Oceanografico y de Pesca, Ministerio de Industrias y Trabajo, Montevideo No. 4: 153–162.
WEIBEZAHN, F.H. (1953) Una nueva especie de Scyliorhinus de Venezuela (Chondrichthyes - Elasmobranchii). Novedades cientificas. Serie zoológica. Museo de Historia Natural La Salle, 9: 1–7.
SMITH, J.L.B. (1958) The mystery killer, the new shark Carcharhinus vanrooyeni. Veld & Vlei, 3 (9): 12–14, 28.
GUBANOV, E.P. & SCHLEIB, N.A. (1980) Sharks of the Arabian Gulf. Kuwait Ministry of Public Works, Agracultural Department, Fisheries Division. Sharks of the Arabian Gulf.: 1–69
DOLGANOV, V.N. (1983) Rukovodstvo po opredeleniyu khryashchevykh ryb dal'nevostochnykh morei SSSR i sopredel'nykh vod. [Manual for identification of cartilaginous fishes of Far East seas of USSR and adjacent waters.] TINRO, Vladivostok. Rukovodstvo po opredeleniyu khryashchevykh ryb dal'nevostochnykh morei SSSR i sopredel'nykh vod.: 92 pp.
Please support www.shark-references.com and send missing papers (not listed papers or papers without the info-symbol) to firstname.lastname@example.org or email@example.com
The 24th Annual Scientific Meeting of the European Elasmobranch Association is planned to be held by the Dutch member group Nederlandse Elasmobranchen Vereniging (NEV) in Leiden, the Netherlands between 3rd and 5th November, 2021.
NEV, in consultation with the EEA Board, has decided to tentatively organise this year’s EEA Meeting as an in-person meeting. Luckily, NEV was able of having secured the same prime venue at the fascinating Naturalis Biodiversity Center! Leiden is a beautiful old university town just 20 mins from Schiphol airport and international train station.
Prior to the main meeting we will organise an online session on November 2nd to allow those who cannot attend in person to contribute.
We understand that there is still a lot of uncertainty as far as travel etc. is concerned. In mid-July we will make the decision whether or not to host a live event.
If an in-person meeting is not possible the entire EEA2021 will be online.
In the coming weeks the website for early registration will be updated, as well as opening the abstract submission for either an online or live presentation.
Details can be found on the NEV website: https://www.elasmobranch.nl/eea2021/
Welcome to ESEB 2021 Congress.
Given the current situation, the organizers
decided to postpone the congress by a year.
Welcome to the ESEB 2021 congress, to be held at the Prague Congress Centre, the Czech Republic, on 22-27 August 2021.
The congresses of the European Society for Evolutionary Biology (ESEB) are organized biennially since 1987 and are now among the largest conferences in evolutionary biology with about 1400 – 1700 participants.
The congress will commence on Sunday, August 22, 2021, with the welcome reception, and will continue until Friday, August 27, concluding with the conference dinner at Občanská Plovárna Restaurant on this evening.
The Prague Congress Centre is easily accessible from the city centre and has a beautiful panoramic view of Prague.
92nd Annual Meeting of the Paläontologische Gesellschaft!
This year's Annual Meeting will be held as online conference from September 27 to 30, 2021.
We are pleased to host the 92nd annual conference of the Paläontologische Gesellschaft (PalGes). The meeting, like the previous ones, is designed as an international meeting to present cutting-edge research from palaeobiology, palaeontology, geobiology and related subjects. The Paläontologische Gesellschaft is one of the oldest and largest palaeontological societies in the world and we "Viennese" are now hosting the annual meeting for the fifth time after 1923, 1954, 1963 and 2011.
The venue will be held as online conference only due to uncertainties over travel and meeting size restrictions related to COVID-19 development. Participation in the conference is free of charge. Unfortunately, the online format means that there will not be any poster session or conference dinner this year.
We will keep you up to date with new and exciting details of our virtual meeting. If you have questions, please do not hesitate to contact us via e-mail.
|TAXONOMIC NEWS/ NEW SPECIES
EBERT, D.A. & LESLIE, R.W. & WEIGMANN, S. (2021): Etmopterus brosei sp. nov.: a new lanternshark (Squaliformes: Etmopteridae) from the southeastern Atlantic and southwestern Indian oceans, with a revised key to the Etmopterus lucifer clade. Marine Biodiversity, 51: 53
New species: Etmopterus brosei
Abstract: A new species of lanternshark, Etmopterus brosei sp. nov. (Squaliformes: Etmopteridae), is described from the southeastern Atlantic and southwestern Indian oceans. The new species resembles other members of the Etmopterus lucifer Jordan & Snyder, 1902 clade in having linear rows of dermal denticles, and most closely resembles the conspecific E. sculptus Ebert, Compagno, & De Vries, 2011 from the southeastern Atlantic and southwestern Indian oceans. The new species is fairly common along the upper continental slopes off South Africa, Mozambique, and seamounts along the Madagascar Ridge, including Walters Shoal, in 480–1200 m depth. It can be distinguished from other members of the E. lucifer clade by a combination of characteristics, including the arrangement of flank and caudal markings, shape and size of flank marking, the arrangement of dermal denticles along the body, and the presence of dermal denticles on the dorsal fin bases. A revised key to the Etmopterus lucifer clade is provided.
WHITE, W.T. & FRICKE, R. (2021): Raja mauritaniensis: a replacement name for Raja africana Capapé, 1977 (Rajiformes: Rajidae), a junior homonym of Raja africana Bloch & Schneider, 1801 (Myliobatiformes: Dasyatidae). Zootaxa, 4970 (2): 399–400
New name: Raja mauritaniensis
Abstract: Raja africana Capapé, 1977 is a primary junior synonym of Raja africana Bloch & Schneider, 1801 and therefore permanently invalid (International Code of Zoological Nomenclature, article 57.2) and must be replaced. Raja africana Bloch & Schneider, 1801 was first described by Bloch & Schneider (1801: 367), based on a specimen from Guinea, West Africa (eastern Atlantic Ocean). The unique holotype is extant in the Zoologisches Museum of the Humboldt University, Berlin (ZMB 7837, a partial dry skin). The species was treated as valid as Urogymnus africanus (Bloch & Schneider 1801) by Compagno & Roberts (1984: 285), but later synonymized with Urogymnus asperrimus (Bloch & Schneider 1801) in the subfamily Urogymninae of the family Dasyatidae (Myliobatiformes) by Compagno (1986: 141), Capapé & Desoutter (1990: 63) and Séret (2016: 1418). It is widespread in the eastern Atlantic, Red Sea and Indo–West Pacific.
LOBODA, T.S. & LASSO, C.A. & ROSA, R.S & DE CARVALHO, M.R. (2021): Two new species of freshwater stingrays of the genus Paratrygon (Chondrichthyes: Potamotrygonidae) from the Orinoco basin, with comments on the taxonomy of Paratrygon aiereba. Neotropical Ichthyology, 19 (2): e200083
New species: Paratrygon orinocensis, Paratrygon parvaspina
Abstract: The genus Paratrygon, currently recognized as the sole monotypic genus of the family Potamotrygonidae, has a considerably greater diversity than previously indicated, including molecular studies, which supported P. aiereba (hitherto the only recognized species in the genus) as a possible species complex. Here we describe two new species of the genus that are both endemic to and sympatric in the Orinoco basin. Paratrygon aiereba, type species of the genus, is now restricted to the Amazon basin. Both new species are identified and defined through morphological characters such as coloration, dermal denticle morphology, arrangement of thorns, distribution and morphology of ventral lateral line canals, morphology of skeletal elements, and morphometrics. An extensive comparison of these characters between the new species herein described and P. aiereba is presented. Finally, a taxonomic reappraisal of P. aiereba is provided through a revision of preserved material and its original description, plus new evidence about its type-locatity, collectors, and a reconsideration of the destination of its type-specimen.
WEIGMANN, S. & EBERT, D.A. & SÉRET, B. (2021): Resolution of the Acroteriobatus leucospilus species complex, with a redescription of A. leucospilus (Norman, 1926) and descriptions of two new western Indian Ocean species of Acroteriobatus (Rhinopristiformes, Rhinobatidae). Marine Biodiversity, 51: 58
New species: Acroteriobatus andysabini, Acroteriobatus stehmanni
Abstract: Recent sampling efforts and examinations of museum material provided evidence for a complex of species within Acroteriobatus leucospilus (Norman, 1926). The present manuscript contains a redescription of A. leucospilus involving the syntypes and additional material, as well as formal descriptions of two new species of Acroteriobatus Giltay, 1928. All specimens of both new species were found in the western Indian Ocean. Individuals of the first new species, hereafter referred to as Acroteriobatus andysabini sp. nov., were identified originating from Madagascar, and specimens of the second new species, hereafter referred to as Acroteriobatus stehmanni sp. nov., were only found off Socotra Islands at the junction between the Gulf of Aden and the Arabian Sea. Both new species appear to be endemic to the respective region and allopatric to A. leucospilus and occur in coastal waters to at least 80 m and 43 m depth, respectively. They differ from A. leucospilus in a number of characteristics including the maximum size and coloration in fresh. Acroteriobatus andysabini sp. nov. is a large species growing to more than 100 cm total length (TL) and with elongated bluish-gray spots on snout giving “stripe-nosed” appearance; numerous small bluish-gray spots on pectoral, pelvic, dorsal, and caudal fins; brown spots on trunk and fin bases; lateral tail folds striped orange and white; and ventral surface largely white but with a V-shape pattern of faint to dark speckled black spots on snout tip. Acroteriobatus stehmanni sp. nov. is a small species growing to ~62 cm TL and with sparse patterning with small bluish-gray circular spots confined to snout tip, posterior pectoral-fin margins, a pair on midbody, and few on posterior pelvic-fin margins, rather indistinct small to larger dark brown spots, and lateral tail folds and ventral surface white. Acroteriobatus leucospilus is a medium-sized species growing to ~96 cm TL and with patterning similar to A. andysabini sp. nov. but ventral surface uniformly white and lateral tail folds white or striped blue and brown. Taxonomical differences include nasal lamellae counts (42–48 in A. andysabini sp. nov. vs. 43–48 in A. stehmanni sp. nov. vs. 37–41 in A. leucospilus), snout angle (76–85° vs. 71–77° vs. 68–81°), and dorsal head length (24.2–33.5% vs. 17.2–22.8% TL vs. 24.0–29.2% TL). A key to the species of Acroteriobatus is given for the first time.
HABIB, K.A. & ISLAM, M.J. (2021): Description of a new species of giant guitarfish, Glaucostegus younholeei sp. nov. (Rhinopristiformes: Glaucostegidae) from the northern Bay of Bengal, Bangladesh. Zootaxa, 4995 (1): 129–146
New species: Glaucostegus younholeei
Abstract: A new species of giant guitarfish, Glaucostegus younholeei sp. nov., is described from 13 specimens, 730–933 mm total length, collected from fish landing center of Bangladesh Fisheries Development Corporation in Cox’s Bazar district of Bangladesh. The new species is distinguished from congeners in having the following combination of characters: Body brownish or greyish in color with a narrowly wedge-shaped disc, and long narrow bluntly pointed snout (angle 31–40°), and broad oblique nostrils with the narrow anterior opening. Nostrils about half of the mouth width, subequal (0.98–1.33) to internasal width; ~55–57 nasal lamellae; anterior nasal flaps slightly penetrating into internasal space, their interspace 2.20– 2.61 in length of the posterior nasal aperture. Orbit very small in adults, diameter 8.19–11.62 in preorbital length, 2.25–2.69 in interorbital space. Rostral ridges almost joined along their entire length; margin of cranium sharply demarcated before eyes. Spiracular folds very short and widely separated. Skin rough, densely covered with small denticles, more coarsely granular on the dorsal surface than ventrally, enlarged between orbits and in a distinct band between nape and first dorsal fin. Tail relatively longer, length 1.15–1.48 in disc length; dorsal fins narrowly spaced, interspace 1.32–2.11 in base length of the first dorsal fin. Clasper length in adult male 4.37–5.70 in total length. Phylogenetic analysis of DNA barcode sequences also shows the clear divergence of Glaucostegus younholeei from other congeneric species obtained from GenBank. A key is provided to the 8 known members including new species of the genus Glaucostegus.
STUMPF, S. & ETCHES, S. & UNDERWOOD, C.J. & KRIWET, J. (2021): Durnonovariaodus maiseyi gen. et sp. nov., a new hybodontiform shark-like chondrichthyan from the Upper Jurassic Kimmeridge Clay Formation of England. Peerj, 9: e11362
New genus: Durnonovariaodus
New species: Durnonovariaodus maiseyi
Abstract: A partial skeleton of a hybodontiform shark-like chondrichthyan from the Upper Jurassic Kimmeridge Clay Formation of Dorset, England, is described and designated as a new genus and species, Durnonovariaodus maiseyi gen. et sp. nov. The holotype and only known specimen, which is represented by disarticulated splanchnocranial elements with associated teeth, a single dorsal fin spine, the pelvic girdle, as well as unidentifiable cartilage fragments, plus countless dermal denticles, exhibits a puzzling combination of dental and skeletal features, providing important new insights into the morphological and ecological diversity of hybodontiforms. Durnonovariaodus gen. nov. displays a unique set of dental characters, showing close morphological resemblance to Secarodus from the Middle Jurassic of England, which was erected for distinctive, strongly labio-lingually compressed multicuspid cutting teeth originally described as Hybodus polyprion. Skeletally, Durnonovariaodus gen. nov. resembles Hybodus and Egertonodus in having a palatoquadrate with a palatobasal process and an ethmoidal articular surface, combined with the possession of dorsal fin spines ornamented with costae. Therefore, and given the absence of any conclusive phylogenetic framework, Durnonovariaodus maiseyi gen. et sp. nov. is here tentatively referred to Hybodontidae until more complete material becomes available in order to enable a more reliable suprageneric identification. The holotype of Durnonovariaodus maiseyi gen. et sp. nov. contains two separate pelvic half-girdles, a feature previously considered as evolutionarily primitive among hybodontiforms. However, unfused pelvic half-girdles also occur in the supposedly closely related species Hybodus hauffianus and may in fact have been more widely distributed among hybodontiforms than previously thought, thus rendering the phylogenetic utility of separated pelvic half-girdles for inferring hybodontiform interrelationships difficult and unresolved.
FEICHTINGER, I. & IVANOV, A.O. & WINKLER, V. & DOJEN, C. & KINDLIMANN, R. & KRIWET, J. & PFAFF, C. & SCHRAUT, G. & STUMPF, S. (2021): Scarce ctenacanthiform sharks from the Mississippian of Austria with an analysis of Carboniferous elasmobranch diversity in response to climatic and environmental changes. Journal of Vertebrate Paleontology, in press
New species: Cladodus gailensis
Abstract: The Carboniferous is characterized by drastic climatic and environmental fluctuations, which include multiple phases of glaciation resulting in an icehouse climate. Additionally, dynamic continental reconfigurations forced the contraction of the Rheic Ocean resulting in the closure of the Rheic–Tethyan Gateway, which precluded further faunal exchanges between the North American and Eurasian marine realms. Interestingly, cartilaginous fishes seem to be relatively immune to these drastic climatic and environmental changes. The Eurasian fossil record of Paleozoic sharks is strongly biased towards intensively sampled localities from England, Ireland, Scotland, and the Russian Platform. Here we present rare dental material from the Serpukhovian (early Carboniferous) of Austria, adding new information to the paleogeographic distribution of ctenacanthiform sharks. The new material revealed the first record of the genus Saivodus in Central Europe and allowed us to recognize a new species, Cladodus gailensis sp. nov., and a remnant of fossilized cartilage. In an attempt to identify possible linkages between climatic or environmental fluctuations on shark diversity throughout the Carboniferous, we provide a synopsis of the distribution and diversity of elasmobranchs based on primary literature. This preliminary assessment at genus level indicates two pronounced events of extinction, with the first one occurring during the latest Mississippian and the second one towards the end of the Pennsylvanian. The first extinction event distinctly correlates with the known diversity decline of other marine inhabitants and the second occurred during an unstable period of multiple phases of glaciation.
LUCCISANO, V. & PRADEL, A. & AMIOT, R. & GAND, G. & STEYER, J.-S. & CUNY, G. (2021): A new Triodus shark species (Xenacanthidae, Xenacanthiformes) from the lowermost Permian of France and its paleobiogeographic implications. Journal of Vertebrate Paleontology, in press
New species: Triodus aeduorum
Abstract: The Xenacanthiformes from Central and Eastern European deposits have been extensively studied, but the systematics of the species from the French Carboniferous–Permian Autun Basin (Saône-et-Loire) remains debated. Numerous xenacanthiform remains are still identified under the doubtful genus ‘Expleuracanthus’, and many of them consist of isolated dorsal spines which are difficult to identify. Numerous well-preserved specimens are still undescribed and the diversity of the xenacanthiform fauna from the Autun Basin is poorly understood. For example, specimens of the genus Triodus from the Muse oil-shale bed (OSB) of the Autun Basin have no specific attribution, whereas this genus is widely distributed across European Carboniferous–Permian basins. In this study, we describe new specimens of Triodus from the lowermost Permian of the Muse OSB. They allow the erection of a new species, Triodus aeduorum sp. nov., and discussion of the validity of several species from the same locality: ‘Expleuracanthus’ frossardi is considered as a nomen dubium and other Triodus specimens need for the time being to be left in open nomenclature as Triodus sp. These results highlight the endemism of the Triodus species in each European Carboniferous–Permian basin and raise the question of how they migrated from one to another.
no taxonomic news this month
Latest Research Articles
AHMED, M.S. & DATTA, S.K. & SAHA, T. & HOSSAIN, Z. (2021) Molecular characterization of marine and coastal fishes of Bangladesh through DNA barcodes. Ecology and Evolution, 11 (9): 3696-3709 https://dx.doi.org/10.1002/ece3.7355
ARASTEHFAR, S. & CHEW, C.M. (2021) Effects of root chord movement on thrust generation of oscillatory pectoral fins. Bioinspiration & Biomimetics, 16 (3): 036009 https://dx.doi.org/10.1088/1748-3190/abc86b
BAKIU, R. & SOLDO, A. (2021) Shark capture by commercial fisheries in Albania. Journal of Applied Ichthyology, in press https://dx.doi.org/10.1111/jai.14208
BASS, N.C. & DAY, J. & GUTTRIDGE, T.L. & KNOTT, N.A. & BROWN, C. (2021) Intraspecific variation in diel patterns of rocky reef use suggests temporal partitioning in Port Jackson sharks. Marine and Freshwater Research, in press https://dx.doi.org/10.1071/mf20204
BERIO, F. & BROYON, M. & ENAULT, S. & PIROT, N. & LOPEZ-ROMERO, F.A. & DEBIAIS-THIBAUD, M. (2021) Diversity and Evolution of Mineralized Skeletal Tissues in Chondrichthyans. Frontiers in Ecology and Evolution, 9: 660767 https://dx.doi.org/10.3389/fevo.2021.660767
BERNAL-PÉREZ, S. & OCHOA-BÁEZ, R.I. & GALVÁN-MAGAÑA, F. & SOTO-LÓPEZ, K. (2021) Reproductive biology of the Swell Shark Cephaloscyllium ventriosum (Carcharhiniformes: Scyliorhinidae). Journal of Fish Biology, in press https://dx.doi.org/10.1111/jfb.14765
BESNARD, L. & LE CROIZIER, G. & GALVÁN-MAGAÑA, F. & POINT, D. & KRAFFE, E. & KETCHUM, J. & MARTINEZ RINCON, R.O. & SCHAAL, G. (2021) Foraging depth depicts resource partitioning and contamination level in a pelagic shark assemblage: Insights from mercury stable isotopes. Environmental Pollution, 283: 117066 https://dx.doi.org/10.1016/j.envpol.2021.117066
BIRKMANIS, C.A. & SIMMONS, L.W. & SEQUEIRA, A.M.M. (2021) Response to Limitations on inferring shark vulnerability from spatial habitat protection. Global Ecology and Conservation, 26: e01466 https://dx.doi.org/10.1016/j.gecco.2021.e01466
BONFIL, R. & PALACIOS-BARRETO, P. & VARGAS, O.U.M. & RICANO-SORIANO, M. & DIAZ-JAIMES, P. (2021) Detection of critically endangered marine species with dwindling populations in the wild using eDNA gives hope for sawfishes. Marine Biology, 168 (5): 60 https://dx.doi.org/10.1007/s00227-021-03862-7
BOUVEROUX, T. & LOISEAU, N. & BARNETT, A. & MAROSI, N.D. & BRUNNSCHWEILER, J.M. (2021) Companions and Casual Acquaintances: The Nature of Associations Among Bull Sharks at a Shark Feeding Site in Fiji. Frontiers in Marine Science, 8: 678074 https://dx.doi.org/10.3389/fmars.2021.678074
BOUYOUCOS, I.A. & TRUJILLO, J.E. & WEIDELI, O.C. & NAKAMURA, N. & MOURIER, J. & PLANES, S. & SIMPFENDORFER, CA. & RUMMER, J.L. (2021) Investigating links between thermal tolerance and oxygen supply capacity in shark neonates from a hyperoxic tropical environment. Science of the Total Environment, 782: 146854 https://dx.doi.org/10.1016/j.scitotenv.2021.146854
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ORTEGA, R.P. (2021) Ethical controversy swirls around shark fossil from Mexico. Science, 372 (6540): 332-333 https://dx.doi.org/10.1126/science.372.6540.332
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WALLACE, S.S. (2021) Sharks, Skates, Rays and Chimeras of British Columbia. Fisheries, in press https://dx.doi.org/10.1002/fsh.10611
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WAXMAN, L. & MYLNICZENKO, N.D. & FUSTUKJIAN, A. & STACY, N.I. (2021) What is your diagnosis? Reproductive tract fluid from a radiated tortoise (Astrochelys radiata) and southern stingray (Hypanus americanus). Veterinary Clinical Pathology, in press https://dx.doi.org/10.1111/vcp.12937
WEIGMANN, S. & EBERT, D.A. & SÉRET, B. (2021) Resolution of the Acroteriobatus leucospilus species complex, with a redescription of A. leucospilus (Norman, 1926) and descriptions of two new western Indian Ocean species of Acroteriobatus (Rhinopristiformes, Rhinobatidae). Marine Biodiversity, 51: 58 https://dx.doi.org/10.1007/s12526-021-01208-6
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WHITE, W.T. & FRICKE, R. (2021) Raja mauritaniensis: a replacement name for Raja africana Capapé, 1977 (Rajiformes: Rajidae), a junior homonym of Raja africana Bloch & Schneider, 1801 (Myliobatiformes: Dasyatidae). Zootaxa, 4970 (2): 399–400 https://dx.doi.org/10.11646/zootaxa.4970.2.12
WILMERS, J. & WALDRON, M. & BARGMANN, S. (2021) Hierarchical Microstructure of Tooth Enameloid in Two Lamniform Shark Species, Carcharias taurus and Isurus oxyrinchus. Nanomaterials, 11 (4): 969 https://dx.doi.org/10.3390/nano11040969
WYFFELS, J.T. & ADAMS, L.M. & BULMAN, F. & FUSTUKJIAN, A. & HYATT, M.W. & FELDHEIM, K.A. & PENFOLD, L.M. (2021) Artificial insemination and parthenogenesis in the whitespotted bamboo shark Chiloscyllium plagiosum. Scientific Reports, 11 (1): 9966 https://dx.doi.org/10.1038/s41598-021-88568-y
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BENNETT, C.E. & KEARSEY, T.I. & DAVIES, S.J. & LENG, M.J. & MILLWARD, D. & SMITHSON, T.R. & BRAND, P.J. & BROWNE, M.A.E. & CARPENTER, D.K. & MARSHALL, J.E.A. & DULSON, H. & CURRY, L. (2021) Palaeoecology and palaeoenvironment of Mississippian coastal lakes and marshes during the early terrestrialisation of tetrapods. Palaeogeography Palaeoclimatology Palaeoecology, 564: 110194 https://dx.doi.org/10.1016/j.palaeo.2020.110194
CEBALLOS-IZQUIERDO, Y. & VINOLA-LOPEZ, L.W. & BORGES-SELLEN, C.R. & ARANO-RUIZ, A.F. (2021) Late Cretaceous sharks from Cuba, first record of Serratolamna serrata (Agassiz) (Lamniformes, Serratolamnidae). Geobios, 65: 1-6 https://dx.doi.org/10.1016/j.geobios.2021.01.002
COLLARETA, A. & LANDINI, W. & BIANUCCI, G. & DI CELMA, C. (2021) Until Panama do us part: new finds from the Pliocene of Ecuador provide insights into the origin and palaeobiogeographic history of the extant requiem sharks Carcharhinus acronotus and Nasolamia velox. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 300 (1): 103-115 https://dx.doi.org/10.1127/njgpa/2021/0981
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DANKINA, D. & SPIRIDONOV, A. & RACZYŃSKI, P. & RADZEVIČIUS, S. (2021) Late Permian ichthyofauna from the North-Sudetic Basin, SW Poland. Acta Palaeontologica Polonica, 66: in press https://dx.doi.org/10.4202/app.00839.2020
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Unexpected presence of great white sharks in Gulf of California
- Date: April 21, 2021
- Source: University of Delaware
- Summary: A new study suggests the white shark population for the eastern north Pacific, especially those listed in the Gulf of California, might be underestimated. Researchers found that the mortality rates for these white sharks might be underestimated as well, as an illicit fishery for the species was uncovered in the Gulf of California, suggesting that fishers were killing many more white sharks than has been previously understood.
Largest-ever study of artificial insemination in sharks -- and the occasional 'virgin birth'
- Date: May 13, 2021
- Source: Field Museum
- Summary: Scientists help protect sharks by developing aquarium breeding programs that pair up individuals in ways that increase genetic diversity. In a new study, scientists undertook the largest-ever effort to artificially inseminate sharks. Their work resulted in 97 new baby sharks, including ones whose parents live on opposite sides of the country and a few that don't have fathers at all.
White shark population is small but healthy off the coast of Central California
- Date: May 19, 2021
- Source: Oregon State University
- Summary: The population of white sharks that call the Central California coast their primary home is holding steady at about 300 animals and shows some signs of growth, a new long-term study of the species has shown.
3,000-year-old shark attack victim
- Date: June 23, 2021
- Source: University of Oxford
- Summary: Researchers reveal their discovery of a 3,000-year-old victim - attacked by a shark in the Seto Inland Sea of the Japanese archipelago.
Fossil shark scales provide a glimpse of reef predator populations before human impact
- Date: July 5, 2021
- Source: University of California - Santa Barbara
- Summary: Scientists recently made news by using fossil shark scales to reconstruct shark communities from millions of years ago.
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Why are some fish warm-blooded? Predatory sharks gain speed advantage, study finds
- Date: July 1, 2021
- Source: Trinity College Dublin
- Summary: New research from marine biologists offers answers to a fundamental puzzle that had until now remained unsolved: why are some fish warm-blooded when most are not? It turns out that while (warm-blooded) fish able to regulate their own body temperatures can swim faster, they do not live in waters spanning a broader range of temperatures.