Eogaleus bolcensis

Cappetta, 1975


Classification: Elasmobranchii Carcharhiniformes Carcharhinidae

Reference of the original description
Cappetta, H. (1975)
Les Sélaciens éocènes du Monte-Bolca. I - Les Carcharhinidae. Miscellanea Paleontologica. Studi e ricerche sui giacimenti Terziari di Bolca, 2: 279–305, 12 fig., pl. 1–8.

Synonyms / new combinations and misspellings
Alopiopsis plejodon

Types
Eogaleus bolcensis
Holotype: MCSNV: T.331;
Alopiopsis plejodon
Holotype: MCSNV: destroyed during the Second World War;

Images of types

Description:


Citation: Eogaleus bolcensis Cappetta, 1975: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 10/2021

Please send your images of "Eogaleus bolcensis" to info@shark-references.com

Eogaleus bolcensis Cappetta, 1975, Eocene Bolca Konservat-Lagerstätte, MCSNV T.331, holotype; © Giuseppe Marramà, Università degli Studi di Torino, Italy

Description
Emended diagnose after Marramà et al. (2018) p. 446 [26259]: A carcharhinid shark with bulky head andshort, broad and rounded snout, not pointed or trian-gular; preoral length much smaller than mouth width;first dorsal fin located in front of the mid-length of thebody; its base equidistant from pectoral- and pelvic-finbases; height of first dorsal fin roughly equals the lengthof its base; posterior margin of first dorsal fin located wellanterior to pelvic-fin insertion; second dorsal fin well-developed and inserting close to anal-fin origin and about2/3 as high as the first dorsal fin; pectoral fin almostequals the size of first dorsal fin and containing about18–19 radials; postero-ventral margin of caudal fin deeplyincised; 135–153 vertebrae of which 50–55 monospondy-lous precaudal, 25–35 diplospondylous precaudals, and60–65 caudals; gradient monognathic and marked dig-nathic heterodonty; about 15 tooth files per half jaw in bothjaws (total row count 30/30); teeth small, not exceeding12 mm in total height; distal cusplets on lower and upperjaw teeth; lower anterior teeth with weakly mesio-distallyexpanded crown and a high central cusp, slightly bentlingually; labial face strongly convex, overhanging labialface of root by a distinct bulge; distal heels of lower lat-eral teeth bearing up to four cusplets; teeth with markedsigmoid profile and strongly convex lingual face of cusp;upper teeth with comparatively higher and wider crownand root; distal heel high and oblique, bearing one to fourstrong cusplets; basal edge of root broad, not rectilinear,with a distinct and deep nutritive furrow; dermal denticleson pectoral fins rounded or subrhombic, relatively smalland not ornamented; rhombic placoid scales of trunk andcaudal fin bearing 5–6 prominent longitudinal ridges withectodermal pits along their posterior edge.

Remarks
valid after Marramà et al. (2018) p. 287 [25955]; Marramà et al. (2018) p. 446 [26259]


References
Marramà, G. & Carnevale, G. & Kriwet, J. (2021)
Diversity, palaeoecology and palaeoenvironmental significance of the Eocene chondrichthyan assemblages of the Bolca Lagerstätte, Italy. Lethaia, in press
DOI: 10.1111/let.12436
Conte, G.L. & Trevisani, E. & Guaschi, P. & Fanti, F. (2020)
New specimen of the rare requiem shark Eogaleus bolcensis from the Bolca Lagerstätte, Italy. Acta Palaeontologica Polonica, 65(3), 547–560
DOI: 10.4202/app.00725.2020
Marramà, G. & Carnevale, G. & Kriwet, J. (2018)
New observations on the anatomy and paleobiology of the Eocene requiem shark †Eogaleus bolcensis (Carcharhiniformes, Carcharhinidae) from Bolca Lagerstätte, Italy. Comptes Rendus Palevol, 17(7), 443–459
DOI: 10.1016/j.crpv.2018.04.005
Marramà, G. & Carnevale, G. & Engelbrecht, A. & Claeson, K.M. & Zorzin, R. (2018)
A synoptic review of the Eocene (Ypresian) cartilaginous fishes (Chondrichthyes: Holocephali, Elasmobranchii) of the Bolca Konservat-Lagerstätte, Italy. Paläontologische Zeitschrift, 92(2), 283–313
DOI: 10.1007/s12542-017-0387-z
Carnevale, G. & Bannikov, A.F. & Marramà, G. & Tyler, J.C. & Zorzin, R. (2014)
The Pesciara-Monte Postale Fossil-Lagerstätte: 2. Fishes and other vertebrates. Rendiconti della Società Paleontologica Italiana, 4, 37–63
Carnevale, G. & Bannikov, A.F. & Marramà, G. & Tyler, J.C. & Zorzin, R. (2014)
The Pesciara-Monte Postale Fossil-Lagerstätte: 2. Fishes and other vertebrates. Rendiconti della Società Paleontologica Italiana, 4, 37–63
Li, G.-Q. (1997)
Elasmobranchs from the Lower Tertiary of the western Tarim Basin, China, and their biostratigraphic significance. Palaeoworld, 7, 107–136
Eastman, C.R. (1904)
Descriptions of Bolca fishes. Bulletin of the Museum of Comparative Zoology at Harvard College, 46(1): 1–40
Jaekel, O. (1894)
Die eocänen Selachier vom Monte Bolca. Ein Beitrag zur Morphogenie der Wirbeltiere. 176 p., 39 fig., 8 pl., Verlag Julius Springer, Berlin
Lioy, P. (1865)
Sopra alcuni avanzi di plagiostomi fossili del Vincentino e specialmente sull' Alopiopsis plejodon Lioy (Galeus cuvieri Ag.). Atti della Società Italiana di Scienze Naturali e del Museo Civico di Storia Naturale di Milano, 8: 398–405, pl. 4.