Vient de paraître

Posté par Lolo il y a 18 ans

Deux publications viennent de paraître:

Gonzalez Riga, Bernardo J. (2005). New fossil remains of _Mendozasaurus
neguyelap_ (Sauropoda, Titanosauria) from the Late Cretaceous of Mendoza,
Argentina. Ameghiniana 42(3): 535-548.

ABSTRACT: In South America, most titanosaur species are represented by
incomplete skeletal elements lacking well-preserved cervical vertebrae. In
this context, the discovery of cervical remains assigned to _Mendozasaurus
neguyelap_ Gonzalez Riga is relevant from a systematic viewpoint. The
fossils were found in the paleontological site and assemblage of the
holotype, Rio Neuquen Subgroup, late Turonian - late Coniacian from Mendoza
Province, Argentina. The cervical vertebrae of _Mendozasaurus_ exhibit
differences with those of most titanosaurs; however, they share with
_Isisaurus colberti_ (Jain and Bandyopadhyay) from Maastrichthian of India
the presence of: a) short vertebral centra (ratio: total length/height of
cotyle less than 2.5), b) large and deep supradiapophyseal fossa, and c)
relatively tall neural spines (ratio: vertebral height / centrum length more
than 1.5). The fossils recovered show an autapomorphic character that
enlarges the diagnosis of _Mendozasaurus_: tall, laminar and transversally
expanded mid-posterior cervical neural spines that are wider than vertebral
centra and 'fan-like' or 'subrhomboid' in shape due to lateral expansions
and a subrounded dorsal border. The fossil record of titanosaurs shows a
notable morphologic diversity in the cervical series. In particular,
_Mendozasaurus neguyelap_ and _Isisaurus colberti_ possess tall neural
spines associated with the proportionally shortest cervical centra of any
titanosaur. This unusual morphology suggests the development of relatively
wide, robust and short necks in Late Cretaceous sauropods from Argentina and
India."

Smith, Joshua B., Lamanna, Matthew C., Mayr, H., and Lacovara, Kenneth J.
(2006). New information regarding the holotype of _Spinosaurus aegyptiacus_
Stromer, 1915. J. Paleont. 80(2): 400-406

Posté par Afrovenator il y a 18 ans

Tout est en anglais chuis pas sur que tout le monde comprenne

Posté par Lolo il y a 18 ans

Désolé, mais je livre les infos telle quelle ...