Sphenacanthus ignis
Figueroa & Gallo, 2017
Classification: Elasmobranchii incert. sedis Sphenacanthidae
Reference of the original description
New chondrichthyan fin spines from the Pedra de Fogo Formation, Brazil. Journal of South American Earth Sciences, 76, 389–396
New chondrichthyan fin spines from the Pedra de Fogo Formation, Brazil. Journal of South American Earth Sciences, 76, 389–396
Description:
Citation: Sphenacanthus ignis Figueroa & Gallo, 2017: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2026
Description
Original diagnosis after Figueroa & Gallo, 2017 [25212]: Chondrichthyan known only by relatively slender fin spine that gradually tappers towards the top; compressed laterally and with slight curvature in the anteroposterior direction; with its posterior face concave or flat, without denticles on the posterolateral margins; lateral faces almost flat and ornamented with smooth longitudinal ridges; ridges become more enlarged laterally at the level of the basal profile; ridges from the posterior portion of the lateral face thinner, especially near the spine apex; new ridges accreted by insertion from the posterior margin of the lateral faces and by bifurcation at medial portions.
Original diagnosis after Figueroa & Gallo, 2017 [25212]: Chondrichthyan known only by relatively slender fin spine that gradually tappers towards the top; compressed laterally and with slight curvature in the anteroposterior direction; with its posterior face concave or flat, without denticles on the posterolateral margins; lateral faces almost flat and ornamented with smooth longitudinal ridges; ridges become more enlarged laterally at the level of the basal profile; ridges from the posterior portion of the lateral face thinner, especially near the spine apex; new ridges accreted by insertion from the posterior margin of the lateral faces and by bifurcation at medial portions.
Remarks
shark-references Species-ID=14874;
shark-references Species-ID=14874;
References
Rise and diversification of chondrichthyans in the Paleozoic. Paleobiology, 50(2), 271–284
DOI: 10.1017/pab.2024.1
The Paleozoic ichthyofauna of the Amazonas and Parnaíba basins, Brazil. Journal of South American Earth Sciences, 82, 122–132
DOI: 10.1016/j.jsames.2018.01.001
New chondrichthyan fin spines from the Pedra de Fogo Formation, Brazil. Journal of South American Earth Sciences, 76, 389–396
DOI: 10.1016/j.jsames.2017.03.015
Rise and diversification of chondrichthyans in the Paleozoic. Paleobiology, 50(2), 271–284
DOI: 10.1017/pab.2024.1
The Paleozoic ichthyofauna of the Amazonas and Parnaíba basins, Brazil. Journal of South American Earth Sciences, 82, 122–132
DOI: 10.1016/j.jsames.2018.01.001
New chondrichthyan fin spines from the Pedra de Fogo Formation, Brazil. Journal of South American Earth Sciences, 76, 389–396
DOI: 10.1016/j.jsames.2017.03.015
