Gyracanthides riniensis
Gess & Burrow, 2024
Classification: Climatiformes Gyracanthidae
Reference of the original description
A new gyracanthid (stem Chondrichthyes) from the Late Devonian (Famennian) of the Eastern Cape, South Africa. Journal of Vertebrate Paleontology, 43(4), Article e2305888
A new gyracanthid (stem Chondrichthyes) from the Late Devonian (Famennian) of the Eastern Cape, South Africa. Journal of Vertebrate Paleontology, 43(4), Article e2305888
Description:
Citation: Gyracanthides riniensis Gess & Burrow, 2024: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2026
No image available.
Please send your images of "Gyracanthides riniensis" to
info@shark-references.com
Please send your images of "Gyracanthides riniensis" to
info@shark-references.com
Description
Original diagnosis after Gess & Burrow, 2024 [32704]: Pectoral spines dorsoventrally flattened, max. depth to length ratio ca. 1:6, insertion length approximately 45% of total length, with ornament ridges oblique over most of the spine and becoming parallel to the trailing edge distally, ridges and grooves of equal width, ca. 18 ridges on each side at mid-spine, arrowhead-shaped nodose ornament on ridges, ca. 11 nodes per cm; pelvic spines with insertion area extending the length of the spine, subparallel ornament ridges angled at 60° to the leading edge at mid-spine level, with groove separating ridges slightly wider than the ridges, ca. 6 nodes per cm; median (?anal) spines laterally flattened, longitudinally curved with a sharp apex, spine length almost twice base length, with insertion ca. one-third the length of the spine along trailing edge, ridges more or less parallel trailing edge, ca. 11 nodes per cm on ridges. Scapulocoracoid simple triangular shape lacking an apical knob. Gy. riniensis differs from Gy. murrayi and Gy. warreni in having ridge ornament of arrowhead-shaped rather than stellate nodes/tubercles, and differs from “Gyracanthus” sherwoodi in ridge ornament and maximum depth:length ratio of pectoral spines. Gy. riniensis differs from all other gyracanthids in having a large, long-based median fin spine ca. 40% the length of the pectoral spine, and in its ridge ornament.
Original diagnosis after Gess & Burrow, 2024 [32704]: Pectoral spines dorsoventrally flattened, max. depth to length ratio ca. 1:6, insertion length approximately 45% of total length, with ornament ridges oblique over most of the spine and becoming parallel to the trailing edge distally, ridges and grooves of equal width, ca. 18 ridges on each side at mid-spine, arrowhead-shaped nodose ornament on ridges, ca. 11 nodes per cm; pelvic spines with insertion area extending the length of the spine, subparallel ornament ridges angled at 60° to the leading edge at mid-spine level, with groove separating ridges slightly wider than the ridges, ca. 6 nodes per cm; median (?anal) spines laterally flattened, longitudinally curved with a sharp apex, spine length almost twice base length, with insertion ca. one-third the length of the spine along trailing edge, ridges more or less parallel trailing edge, ca. 11 nodes per cm on ridges. Scapulocoracoid simple triangular shape lacking an apical knob. Gy. riniensis differs from Gy. murrayi and Gy. warreni in having ridge ornament of arrowhead-shaped rather than stellate nodes/tubercles, and differs from “Gyracanthus” sherwoodi in ridge ornament and maximum depth:length ratio of pectoral spines. Gy. riniensis differs from all other gyracanthids in having a large, long-based median fin spine ca. 40% the length of the pectoral spine, and in its ridge ornament.
Remarks
shark-references Species-ID=17631
shark-references Species-ID=17631
References
A new gyracanthid (stem Chondrichthyes) from the Late Devonian (Famennian) of the Eastern Cape, South Africa. Journal of Vertebrate Paleontology, 43(4), Article e2305888
DOI: 10.1080/02724634.2024.2305888
New morphological information on, and species of placoderm fish Africanaspis (Arthrodira, Placodermi) from the Late Devonian of South Africa. PLoS ONE, 12(4), Article e0173169
DOI: 10.1371/journal.pone.0173169
Vertebrate Biostratigraphy of the Witteberg Group and the Devonian-Carboniferous Boundary in South Africa. In B. Linol & M.J. de Wit (Eds.), Origin and Evolution of the CapeMountains and Karoo Basin (pp. 131–140). Springer International Publishing
DOI: 10.1007/978-3-319-40859-0_13
Gyracanthides hawkinsi sp. nov. (Acanthodii, Gyracanthidae) from the Lower Carboniferous of Queensland, Australia, with a review of gyracanthid taxa. Palaeontology, 48(5), 963–1006
DOI: 10.1111/j.1475-4983.2005.00479.x
The Palaeozoic, Mesozoic and Early Cenozoic fishes of Africa. Fish and Fisheries, 1(2), 111–145
DOI: 10.1046/j.1467-2979.2000.00015.x
Biogeographic affinities of Middle and Late Devonian fishes of South Africa Records of the Western Australian Museum, Supplement 57, 157–168
New placoderm fishes from the Late Devonian of South Africa. Journal of Vertebrate Paleontology, 17(2), 253–268
The first Bothriolepis-associated Devonian fish fauna from Africa. South African Journal of Science, 90(7), 397–403
A new gyracanthid (stem Chondrichthyes) from the Late Devonian (Famennian) of the Eastern Cape, South Africa. Journal of Vertebrate Paleontology, 43(4), Article e2305888
DOI: 10.1080/02724634.2024.2305888
New morphological information on, and species of placoderm fish Africanaspis (Arthrodira, Placodermi) from the Late Devonian of South Africa. PLoS ONE, 12(4), Article e0173169
DOI: 10.1371/journal.pone.0173169
Vertebrate Biostratigraphy of the Witteberg Group and the Devonian-Carboniferous Boundary in South Africa. In B. Linol & M.J. de Wit (Eds.), Origin and Evolution of the CapeMountains and Karoo Basin (pp. 131–140). Springer International Publishing
DOI: 10.1007/978-3-319-40859-0_13
Gyracanthides hawkinsi sp. nov. (Acanthodii, Gyracanthidae) from the Lower Carboniferous of Queensland, Australia, with a review of gyracanthid taxa. Palaeontology, 48(5), 963–1006
DOI: 10.1111/j.1475-4983.2005.00479.x
The Palaeozoic, Mesozoic and Early Cenozoic fishes of Africa. Fish and Fisheries, 1(2), 111–145
DOI: 10.1046/j.1467-2979.2000.00015.x
Biogeographic affinities of Middle and Late Devonian fishes of South Africa Records of the Western Australian Museum, Supplement 57, 157–168
New placoderm fishes from the Late Devonian of South Africa. Journal of Vertebrate Paleontology, 17(2), 253–268
The first Bothriolepis-associated Devonian fish fauna from Africa. South African Journal of Science, 90(7), 397–403
