[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: maxillary fenestration (was "magical" feathers)
Ken Kinman wrote-
> What coelurosaurs are known to have had maxillary fenestration, and
> is there a good chance that Erlikosaurus and Chirostenotes didn't have
> fenestration in their ancestry?
> Could this be a red flag that we need to look closer at the
> that have resulted in the conclusion that they "lost" maxillary
> from ancestors that "possessed" this character?
Almost every coelurosaur whose maxilla is known has maxillary fenestration,
as do most tetanurines. Coelurosaurs with such a fenestra include-
tyrannosaurids, ornithomimosaurs, compsognathids, Ornitholestes,
Proceratosaurus, Scipionyx, Caudipteryx, oviraptorids, Shuvuuia,
troodontids, "Chilantaisaurus" maortuensis, dromaeosaurids, Achillobator,
Bambiraptor, Sinornithosaurus, Archaeopteryx and confuciusornithids. In
addition, Dilophosaurus, Ceratosaurus, abelisaurids, Afrovenator,
Piatnitzkysaurus, Eustreptospondylus, Monolophosaurus and allosauroids have
maxillary fenestration. The only coelurosaurs without such fenestrae are
Erlikosaurus, Chirostenotes and enantiornithines (perhaps ornithurines too,
I haven't studied them too closely). As they are deeply nested in the
Coelurosauria and closely related to other taxa with maxillary fenestrae, it
is obvious they lost the character sometime in their evolution.