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New in Acta Palaeontologica Polonica



Haven't seen some of these (except one) reported to the list yet, so-

New data on cranial anatomy of the ceratopsian dinosaur Psittacosaurus major

http://www.app.pan.pl/article/item/app53-183.html

HaiâLu You, Kyo Tanoue, and Peter Dodson
Acta Palaeontologica Polonica 53 (2), 2008: 183-196

ABSTRACT
An exceptionally preserved skull and mandible of ceratopsian dinosaur
Psittacosaurus major revealed many anatomical details such as the
existence of an elliptical median interpremaxillary foramen, a
prominent neurovascular canal on the internal wall of the beak, long,
slightly divergent basipterygoid processes developed as vertical
blades with a deep cleft between them, and horizontally oriented
vomer. The new specimen shows two autapomorphies of An exceptionally
preserved skull and mandible of ceratopsian dinosaur Psittacosaurus
major revealed many anatomical details such as the existence of an
elliptical median interpremaxillary foramen, a prominent neurovascular
canal on the internal wall of the beak, long, slightly divergent
basipterygoid processes developed as vertical blades with a deep cleft
between them, and horizontally oriented vomer. The new specimen shows
two autapomorphies of Psittacosaurus major, the transversely narrow
dorsal skull roof and very prominent dentary flanges, confirming the
presence of two largeâskulled psittacosaur species in the Lujiatun Bed
of the Lower Cretaceous Yixian Formation in Beipiao City, western
Liaoning Province, China, the longâ and narrowâskulled P. major, and
broadâskulled P. lujiatunensis.

Crouching theropod and Navahopus sauropodomorph tracks from the Early
Jurassic Navajo Sandstone of USA

http://www.app.pan.pl/article/item/app53-197.html

Jesper MilÃn, David B. Loope, and Richard G. Bromley
Acta Palaeontologica Polonica 53 (2), 2008: 197-205

ABSTRACT
Numerous tracks and trackways are preserved in the a crossâstrata of
the Lower Jurassic Navajo Sandstone of northern Arizona and southern
Utah, USA. Tracks and trackways of small theropod dinosaurs are
particularly abundant within one 10âmâthick interval. This paper
describes a crouching trace from a theropod dinosaur that shows
impressions of all four limbs, the ischial callosity, the tail, and
tracks leading to and away from the crouching site, and revises the
interpretation of a well preserved trackway hitherto referred to the
synapsid ichnogenus Brasilichnium and here considered to be from a
sauropodomorph dinosaur. It is named Navahopus coyoteensis isp. nov.
on the basis of morphological differences from the type ichnospecies
N. falcipollex. The ichnofamily Navahopodidae is revised to include
Tetrasauropous unguiferus, Navahopus falcipollex, and N. coyoteensis.

Gastroliths in an ornithopod dinosaur

http://www.app.pan.pl/article/item/app53-351.html

Ignacio A. Cerda
Acta Palaeontologica Polonica 53 (2), 2008: 351-355

ABSTRACT
Gastroliths (stomach stones) are known from many extant and extinct
vertebrates, including dinosaurs. Reported here is the first
unambiguous record of gastroliths in an ornithopod dinosaur. Clusters
of small stones found in the abdominal region of three articulated
skeletons of Gasparinisaura cincosaltensis were identified as
gastroliths on the basis of taphonomic and sedimentologic evidence.
The large number of stones found in each individual, their size, and
the fact that Gasparinisaura cincosaltensis was herbivorous, all
suggest that they were ingested as a result of lithophagy rather than
accidental swallowing.

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Cheers,
Nick