Debeerius: enters the LRT basal to Rhinochimaera
Debeerius ellefseni
(Grogan and Lund 2000; Mississipian, 320 mya) was originally considered intermediate betweeen sharks and ratfish, but here nests between Chimaera and Rhinochimaera (Figs 3–5).
Rhinochimaera pacifica
(Mitsukuri 1895, 130cm in length) is the extant Pacific spookfish. A long nasal bone greatly extends the rostrum, creating a larger sensory surface, as in sawfish, hammerheds and paddlefish by convergence.
References
Grogan ED and Lund R 2000. Debeerius ellefseni (Fam. Nov.,Gen. Nov., Spec Nov.), an autodiastylic chondrichthyan from the Misssissippian Bear Gulch limestone of Montana (USA), the relationships of the Chondrichthyes, and comments on gnathostome evolution. Journal of Morphology 243:219–245.
Source: https://pterosaurheresies.wordpress.com/2020/12/28/debeerius-enters-the-lrt-basal-to-rhinochimaera/
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