[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Dinosaurs of Morrison Formation
On Sat, 29 May 1999 00:42:21 +0100 "Octavio Mateus"
>I made the list of dinosaurs known in Morrison Formation: 19 species =
>(!!!!) of sauropods, 10 species of theropods and 14 species of =
>ornithischians. Feel yourself free to do comments if there are =
>nomenclature changes or other in this list.=20
> It was based in Carpenter (1998), Carpenter et al. (1998), Dodson=
>et al. (1980) and Weishampel (1990).
> How much is the area of Morrison Formation???
>DINOSAURS OF MORRISON FORMATION
Both species of *Amphicoelias* are suspect, and the type of *A.
fragillimus* is missing. However, new material has been found and
assigned to *Amphi*.
I'm not sure how well this one is faring. Another sauropod that needs
a new name from the Morrison is "Morosaurus" *agilis*, which is based on
some cranial material and cervicals, and may belong to
*Haplocanthosaurus*. Possibly synonymous with *Apatosaurus* is
"Titanosaurus" *montanus*, otherwise known as *Atlantosaurus*.
*C. grandis* has been referred to *C. supremus* in the past (White
1958), but has been accepted as distinct since then (McIntosh in *The
Dinosauria*). So, it may or may not be distinct.
*D. lacustris* is dubious, and I wouldn't be surprised if it turned
out to be the same as one of the other species of *Diplo*.
This one is usually considered dubious. In Glut's 1997 encyclopedia,
it is claimed that the location where the holotype was found has been
rediscovered, and that bones there may belong to the holotype, so this
taxon may make a reappearance.
*Supersaurus vivianae* (Jensen, 1985b) is also Morrison, although some
have synonymized it with other sauropods (I think *Dystylosaurus* is one
of the candidates). *Dyslocosaurus polyonychius* (McIntosh, Coombs, and
Russell, 1992) may be from either the Morrison or the Lance formation; I
don't know if that one's settled.
Some workers have *A. fragilis* separated into two or more species.
For example, in *Predatory Dinosaurs of the World*, a lot of the material
previously assigned to *A. fragilis* is considered to belong to *A.
atrox*. Another species, *A. amplexus*, which is based on the old
*Epanterias* material, is differentiated by its large size. It may be
the same as *Saurophaganax maximus* (1995), which is another huge
Morrison theropod. Plus, there may be some new species published.
*C. agilis* is considered to be the same as *C. fragilis*.
This is a dubious name.
*Koparion douglassi* (Chure, 1994), a tooth taxon that has been
suggested as a troodontid, is also Morrison. There are some informal
names of Morrison theropods going around ("Brontoraptor",
"Wyomingraptor", and "Beelemodon"; I think those are all Morrison), and a
large theropod named *Edmarka rex* (Bakker, Kralis, Siegwarth, and Filla,
1992) may be the same as *Torvosaurus*. Also, there is *Palaeopteryx
thomsoni* (Jensen, 1981), which has been considered both a bird and a
nonavian theropod, current opinion favoring a nonavian theropod status.
This one I'm not sure about. In Glut's 1997 encyclopedia, its
holotype, a foot, is said to belong to *Allosaurus fragilis*.
Since the holotype of *C. depressus* is much younger in age
(Barremian, unless the formation [Lakota] was misidentified), this
material may be misidentified.
*C. prestwichii* is from England, not the Morrison.
This is a dubious ornithopod.
This is dubious as well.
*Stegosaurus* may have more valid species than these, or it may be two
genera (*Diracodon* usually being the second name). Also, I had seen (on
the Dinosauricon, I think) that *S. longispinus* may be a species of
Material from the Morrison of Grand Junction, Colorado has been
referred to *Echinodon* sp. Also, there are two more dubious species
that may be ornthischian: *Tichosteus lucasanus* and *T. aequifacies*.
Both are based on vertebrae.
> Oct=E1vio Mateus
>GEAL- Museu da Lourinh=E3
>Tel. & Fax: 00.351.61.413995
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]