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Re: Pleurocoelus




Jerry Harris wrote:

But don't bother paying to track it down; you
can get the English translation for free on the Polyglot Paleontologist web
site:

http://blackwidow.informatics.sunysb.edu/anatsci/thanks.cfm

Wow, what a find! This site has translations of the papers that describe _Yandusaurus_, _Gongxianosaurus_, _Bellusaurus_... and Dollo's assertion that the hadrosaur _Aachenosaurus multidens_ is really just a lump of wood (first published 1888)!


Also, some interesting stuff on _Pleurocoelus_, from Salgado et al.'s abstract. According to them:

(1) _Pleurocoelus nanus_ (type species, from the Arundel Formation of Maryland) is the possible sister-taxon to the Titanosauria; it shows a few titanosauriform synapomorphs (absence of phalangeal articular surfaces on the distal metacarpals; transversely expanded distal tibia), but its anterior caudal vertebrae are amphiplatyan, not procoelous.

(2) _P. altus_ (also from the Arundel Fm) is NOT an adult _P. nanus_; it probably does not even belong in the same genus. _P. altus_ "exhibits an anteroposteriorly expanded distal tibia, a character which is plesiomorphic for sauropods."

(3) The _Pleurocoelus_ material from the Comanche Series of Texas, definitely does NOT belong in the genus _Pleurocoelus_. Its anterior caudals are procoelous (albeit slightly). Based on this and other features ("dorsal vertebrae with the infradiapophyseal laminae bifurcated at their base, and the presence of a centro-parapophyseal lamina") the Comanche sauropod appears to be a basal titanosaur.

What a mess! If Salgado and co are correct, no less than THREE sauropod genera are represented from among the Lower Cretaceous North American material named "Pleurocoelus". So much for the sauropod hiatus! I hope Salgado et al. follow this abstract up with a complete publication.


Tim


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