[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Amazonsaurus and the Itapecuru dicraeosaurid
>Thanks to both Mickey Mortimer and Jose Ignacio Ruiz-Omenaca for sending me
>the Amazonsaurus PDF; now all I have to do is find time to read it. I was
>under the impression that Amazonsaurus was the same animal mentioned the SVP
>2002 abstract "A New Sauropod from the Aptian-Albian of Brazil and its
>phylogenetic relationships" I was apparently wrong, seeing as how this
>abstract mentions an axis and assigns the sauropod to Dicraeosauridae. Does
>anyone have further information on this other Itapecuru taxon?
I thik that "the Itapecuru specimen" and Amazonsaurus maranhensis are the same
"The Itapecuru specimen is known from a few, but diagnostic postcranial
skeleton comprising several incomplete vertebrae, isolated centra, neural
spines, chevrons, both scapulae and a complete ilium" (Carvalho & Avilla,
and the holotype of Amazonsaurus maranhensis has "two dorsal neural spines; two
dorsal centra; neural spine of anterior caudal vertebra; one mid caudal
vertebra; one mid-posterior caudal vertebra; two posterior caudal vertebrae;
eight chevrons; an ilium; a partial pubis; and three ribs" (Carvalho et al.,
Perhaps the "very elongated neural spine of the axis" of Carvalho & Avilla
(2002) has been reidentified as the "neural spine of anterior caudal vertebra"
figured in Carvalho et al. (2003), and the scapulae of Carvalho & Avilla
(2002) could be the two dorsal neural spines of Carvalho et al. (2003), or
could be not from a sauropod but any othed dinosaur. It should be noted that
Amazonsaurus´ bones were associated with turtles and crocodyle and theropod
teeth, so many taxa fossilized together in the "proximal fluvial mouthbar
deposits" of the locality.
Hope this helps.
Jose Ignacio Ruiz-Omeñaca
Departamento de Ciencias de la Tierra
Area de Paleontologia
Universidad de Zaragoza
E-50009 ZARAGOZA, SPAIN
tel: (+34) 976 761000 ext. 3160
fax: (+34) 976 761106