Ctenacanthidae Dean, 1909

Ginter, Michał, Duffin, Christopher J., Dean, Mark T. & Korn, Dieter, 2015, Late Viséan pelagic chondrichthyans from northern Europe, Acta Palaeontologica Polonica 60 (4), pp. 899-922 : 915

Family Ctenacanthidae Dean, 1909 Ctenacanthidae gen. et sp. indet.

Fig. 13G .

Material.—Two teeth from upper Viséan of Todowa Grząba, north of Ostrówka Quarry, Gałęzice Region, Holy Cross Mountains, Poland (sample TG-D); MWGUW/Ps/11/20.

Description and remarks.—This taxon is represented by two minute (0.5 mm across the base), five-cusped cladodont teeth with the crowns compressed labio-lingually and all the cusps connected with the continuous carina, in the same manner as in other ctenacanthids. There are a few cristae on each side of the median cusp. There is an orolingual ridge which is slightly wider than the base of the median cusp. All these features suggest that these are juvenile teeth of the Ctenacanthidae , but more precise identification is impossible.

Figures

Fig. 13. Cladodont teeth from the upper Viséan of Todowa Grząba, north of Ostrówka Quarry, Gałęzice Region, Holy Cross Mountains, Poland. A–D. Denaea wangi Wang, Jin, and Wang, 2004. A. MWGUW/Ps/7/6, in labial (A 1), oral (A 2), and lingual (A 3) views. B. ZPAL P.IV/224, in lingual (B 1) and oral (B 2) views. C. ZPAL P.IV/223, in lateral (C 1) and oral (C 2) views. D. ZPAL P.IV/222, in lingual (D 1) and oral (D 2) views. E, F. Denaea williamsi Ginter and Hansen, 2010. E. MWGUW/Ps/11/18, in lingual (E 1), labial (E 2), lateral (E 3), and oral (E 4) views. F. MWGUW/Ps/11/19, tooth with two cusps broken off in lingual view. G. Ctenacanthidae gen. et sp. indet., MWGUW/Ps/11/20, in lingual (G ), oral (G ), and labial (G ) views.