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This is from a while back, but I don't seem to
recall it being mentioned previously n the list. On http://www.paleonet.com.ar/ you
can download abstracts from the XVI Jornadas Argentinas de Paleontología de
Vertebrados that occured on May 15-17. Most are in Spanish, but they do
include several interesting dinosaur papers. Besides lots of egg and
footprint stuff, we have...
Coria, 2000. New findings of dinosaurs in the Rio
Neuquen Basin.
Basically lists the dinosaurs known from the
Neuquen Group. Nothing new, but Ilokelesia is mentioned as well
as Coria and Chiappe's new abelisaurid, which is described
later.....
Bertini, Santucci, Ribeiro and Arruda-Campos, 2000.
Aeolosaurus (Sauropoda: Titanosauria) from Upper Cretaceous of
Brazil.
This sums up all the occurences of
Aeolosaurus. The most intriguing comment is that they synonymize
Gondwanatitan with Aeolosaurus based on the anterodorsally projected neural
spine on proximal caudal vertebrae and "other appendicular
characters".
The original description of Gondwanatitan notes
however, that the two genera differ in several features:
- sixth sacral centrum with concave posterior
articular surface in Gondwanatitan
- heart-shaped posterior articular surfaces on
proximal and mid caudal centra in Gondwanatitan
- prominent lateral ridge on basal part of mid
caudal neural arch in Gondwanatitan
- large articulation of the prezygopophyses in
Aeolosaurus
- lateral tuberosity present on ischium in
Gondwanatitan
- iliac peduncle of ischium less expanded in
Gondwanatitan
- medial ischiac plate less expanded in
Aeolosaurus
- more slender humerus in Aeolosaurus
Thus, I do not accept the synonomy of thse two
genera.
Coria and Chiappe, 2000. New abelisaurid theropod
from the Rio Colorado Formation (Late Cretaceous) of Neuquen
Province.
This describes the new, nearly complete abelisaurid
mentioned in connection to Ilokelesia earlier on the list. It was
discovered in Auca Mahuevo, where all the titanosaurid embryos were described
two years ago. It is the sister group of Carnotaurus based on cranially
oriented processes on the cervical epipophyses and hyposphene-hypantrum
articulations in the proximal caudal vertebrae. There are also shared
characters with an ambiguous distribution among abelisaurids (due to poor
postcranial remains) including lateral frontal prominences; large coracoid;
humerus with large hemispherical head; very short radius and ulna. It is
distinguished from Carnotaurus by a lower snout and antorbital fenestra; a
promaxillary fenestra showing laterally; the presence of prominences, not horns,
on the frontals; chevrons with heamal canal; reduced coracoid process; other
forelimb characters I can't read in Spanish. Thus, it is a new
taxon.
Diaz, Vargas, Rubilar, Suarez, Cacares and Kellner,
2000. Cretaceous dinosaur locality at the Atacama Desert, Northern
Chile.
A new Chilean locality with two incomplete
titanosaur skeletons, based on procoelous distal caudals. This suggests a
Late Cretaceous age for the site.
Gonzalez Riga and Casadio, 2000. New remains of
Hadrosauridae (Ornithischia) from the Allen Formation, Pampas Province,
Argentina.
Hadrosaurine elements (cervical and dorsal
vertebrae, scapular fragments, coracoids, femur, phalanges) from the Allen
Formation of the Falkland Islands. The specimen exhibits opisthocoelous,
heart-shaped cervical centra, cervical neural arches with robust
postzygopophyses, reduced neural spines and amphiplatyan dorsal centra.
The large dorsal centra are hexagonal. Hadrosaurid characters are also
seen in the scapulae, coracoids and phalanges. The short dorsal neural
arches with vertically oriented diapophyses ally it with hadrosaurines.
Although too incomplete for specific determination, it is not synonymous with
Kritosaurus? australis.
Vargas, Suarez, Rubilar and Moreno, 2000. A
titanosaurid vertebra from Pichasca, Formation La Vinita (Late Cretaceous), IV
Region, Northern Chile.
The La Vinita Formation is Maastrichtian and has
produced the anterior half of a titanosaurid posterior dorsal vertebrae (MNHN
387, centrum width 35 cm, centrum height 25 cm). The pleurocoels are
elongate and there are no hyposphenes.
That's all the dinosaurian osteological
articles. I just got the papers on Charonosaurus and Isanosaurus, so I'll
be writing details segments on them soon, but college really takes time out of
the day.
Mickey Mortimer
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