A new Late Jurassic species of the rare synechodontiform shark, Welcommia (Chondrichthyes, Neoselachii)

A new Jurassic cow shark (Chondrichthyes, Hexanchiformes) with comments on Jurassic hexanchiform systematics

“…The tooth root of synechodontiforms, which is comparably low, is characterized by a pseudopolyaulacorhize vascularization pattern, and displays a labial depression in basal view, which is lacking in hexanchiforms (Klug 2010). Additionally the morphology of the tooth crown of pseudonotidanids presents a divergent pattern of the main cusp and the first distal cusplet (Klug and Kriwet 2010).…”