Re: [dinosaur] Mystery New Mexico lagerpetid in Timetracks

To: Stephen Poropat <stephenfporopat@gmail.com>

Subject: Re: [dinosaur] Mystery New Mexico lagerpetid in Timetracks

From: Mickey Mortimer <mickey_mortimer111@msn.com>

Date: Fri, 23 Apr 2021 01:13:20 +0000

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Reply-to: Mickey Mortimer <mickey_mortimer111@msn.com>

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Thread-topic: [dinosaur] Mystery New Mexico lagerpetid in Timetracks

Oops, you're right. So it's from 1988ish. I wonder if it's the juvenile Postosuchus then?

Mickey Mortimer

From: Stephen Poropat <stephenfporopat@gmail.com>
Sent: Thursday, April 22, 2021 5:27 PM
To: Mickey Mortimer <mickey_mortimer111@msn.com>
Cc: DML <dinosaur-l@usc.edu>
Subject: Re: [dinosaur] Mystery New Mexico lagerpetid in Timetracks

Looking at the scan of Olshevsky (1991) that I have, this should read 8(4): p. 4. I suspect I have the same PDF as you as the OCR has picked the volume number up as a 5 rather than an 8.

On Fri, 23 Apr 2021 at 09:53, Mickey Mortimer <mickey_mortimer111@msn.com> wrote:

Hi everyone. Olshevsky (1991) lists the following entry under Lagerpetonidae-

"Genus: [To be described from the Upper Triassic of New Mexico: a new kind of "thecodont similar to a small dinosaur"; cf. New Mexico Museum of Natural History publication Timetracks 5(4): p.4]"

Does anyone know what it could be? Timetracks volume 11 was from 1991, and 15 was from 1994, so this is from around 1985. Chindesaurus is an obvious possibility, but that has its own entry on the same page under Staurikosauridae. The Hayden Quarry that Dromomeron romeri is from wasn't opened until 2006. Effigia wasn't studied until 2004 although it was sitting unrecognized in the AMNH for decades. Juvenile Postosuchus CM-73372 wasn't found until 1988-1989. There are no significant Poposaurus or Shuvosaurus remains from the state. Maybe Eucoelophysis, which was found in 1983? Although everything I've read says that that was thought to be a theropod until decades later...

Reference- Olshevsky, 1991. A revision of the parainfraclass Archosauria Cope, 1869, excluding the advanced Crocodylia. Mesozoic Meanderings. 2, 196 pp.

Mickey Mortimer

Dr Stephen F. Poropat

Research Associate

Australian Age of Dinosaurs Museum of Natural History

1 Dinosaur Drive, The Jump-Up

Winton, Queensland

Australia 4735