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