2013年

8月

20日

ブラジル、サンパウロ州から後期白亜紀のティタノサウリア類

ブラジル、サンパウロ州、プレジデンテプルデンテ(Presidente Prudente)市近郊のAdamantina層(チューロニアン―サントニアン)、バルル盆地から産出した骨格部分に基づき記載されています。

Brasilotitan nemophagus 新属新種

Elaine B. Machado, Leonardo dos S. Avilla, William R. Nava, Diogenes
de A. Campos & Alexander W. A. Kellner (2013)
A new titanosaur sauropod from the Late Cretaceous of Brazil.
Zootaxa 3701 (3): 301–321
doi: http://dx.doi.org/10.11646/zootaxa.3701.3.1
preview:
http://www.mapress.com/zootaxa/2013/f/z03701p321f.pdf


A new titanosaur dinosaur, Brasilotitan nemophagus gen. et sp. nov.,
is described from the Adamantina Formation (Turonian-Santonian, Bauru
Basin). The specimen consists of a dentary, cervical and sacral
vertebrae, one ungual and remains of the pelvic region, that were
collected near Presidente Prudente city, São Paulo State. It shows a
mandible with an ‘L’ shaped morphology, with the symphyseal region of
the dentary slightly twisted medially, a feature never recorded before
in a titanosaur. Brasilotitan nemophagus can be further separated from
other members of this clade by: (1) the dorsal portion of the dentary
symphyseal contact is broader anteroposteriorly than the ventral part;
(2) the ventral portion of the cervical centrum is arched dorsally;
(3) the presence of an anteriorly directed accessory prezygapophyseal
articulation surface on the cervical vertebrae; (4) the
intraprezygapophyseal laminae of the cervical vertebrae are ‘V’ shaped
in dorsal view; and other features. Although the phylogenetic position
of Brasilotitan nemophagus is difficult to establish, the new species
is neither a basal nor a derived member of the Titanosauria and, based
on the lower jaw morphology, appears to be closely related to
Antarctosaurus wichmannianus and Bonitasaura salgadoi. This discovery
enriches the titanosaur diversity of Brazil and further provides new
anatomical information on the lower jaws of those herbivorous
dinosaurs.

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