Proteothrinax

Thrinax baumgartneri
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	Hexanchiformes
Family:	Chlamydoselachidae
Genus:	Proteothrinax
Species:	P. baumgartneri
Binomial name
	Proteothrinax baumgartneri; Pfeil, 1983

Proteothrinax baumgartneri is an extinct species of shark. It was classified based on two relatively complete teeth and two isolated crowns. Due to the limited material available and its similarities to Chlamydoselachus fiedleri, it has been suggested that the criteria with which P. baumgartneri is separated from Chlamydoselachus fiedleri are within the normal variation of Chlamydoselachus.^[1] This would therefore make T. baumgartneri a junior synonym to Chlamydoselachus fiedleri and, since there is only one identified species within genus Thrinax, the whole genus a junior synonym to Chlamydoselachus.

References

^ Richter, Martha (March 1990). "Fish remains from the Santa Marta Formation (Late Cretaceous) of James Ross Island Antarctica". Antarctic Science. 2 (01). Cambridge University Press: 67–76. doi:10.1017/S0954102090000074. no {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

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[1] Richter, Martha (March 1990). "Fish remains from the Santa Marta Formation (Late Cretaceous) of James Ross Island Antarctica". Antarctic Science. 2 (01). Cambridge University Press: 67–76. doi:10.1017/S0954102090000074. no {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)

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