Pambdelurion, o ancestral comum da maioria dos seres vivos?

domingo, outubro 09, 2016

The mouth apparatus of the Cambrian gilled lobopodian Pambdelurion whittingtoni

Authors Jakob Vinther, Luis Porras, Fletcher J. Young, Graham E. Budd, Gregory D. Edgecombe

First published: 26 September 2016 Full publication history


Omnidens is a large feeding apparatus composed of circlets of teeth, first documented from the early Cambrian of China. Originally interpreted as the oral cone of a radiodontan, it was later reinterpreted as the introvert of a priapulan. In both cases the Omnidens mouthparts underpinned estimates of gigantic (c. 2 m) body size. Recent evidence has been used to suggest that pharyngeal teeth and radially-arranged oral plates in the stem-group onychophoran Hallucigenia and the lower stem-group euarthropod Jianshanopodia are homologous to structures of the introvert in priapulans and other scalidophorans, and are thus primitive characters for moulting animals (Ecdysozoa) as a whole. Here we show that the early Cambrian gilled lobopodian Pambdelurion whittingtoni from Sirius Passet, Greenland, possesses a mouth apparatus identical to Omnidens, being composed of the same three zones with detailed similarities of sclerites in each zone. An oral cone with rings of pharyngeal teeth, radial plates and outer scalid-like plates are ecdysozoan characters retained in the euarthropod stem group. Omnidens from China probably belongs to an unrecognized Pambdelurion-like animal rather than being part of a giant priapulan.

DOI: 10.1111/pala.12256

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Keywords: Cambrian; Pambdelurion ; Sirius Passet Lagerstätte; Ecdysozoa

Publication History

Version of record online: 26 September 2016 Manuscript Accepted: 30 July 2016

Manuscript Received: 31 March 2016 

Funded by Agouron, Carlsberg and Geocenter Denmark

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