[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

_Hadrosaurus_ in new Acta Palaeontologica Polonica



In the new APP:

Albert Prieto-Márquez, David B. Weishampel, and John R. Horner. 2006.
The dinosaur Hadrosaurus foulkii, from the Campanian of the East Coast
of North America, with a reevaluation of the genus. Acta Palaeontologica
Polonica 51 (1): 77-98.

?Hadrosaurus foulkii was the first dinosaur known outside Europe from
partially complete skeletal elements. It is the holotype of the family
Hadrosauridae and the subfamily Hadrosaurinae. The history of its
discovery and taxonomy is reviewed, and the holotype of H. foulkii is
redescribed. The holotype of H. foulkii lacks distinguishing characters;
therefore, this taxon is a nomen dubium. It is not synonymous with
species of Gryposaurus and/or Kritosaurus. We also reevaluate the
taxonomy and osteology of H. tripos, H. minor, H. cavatus, H. breviceps,
H. paucidens, and Ornithotarsus immanis. In agreement with previous
studies, these taxa are considered nomina dubia due to the absence of
distinguishing characters and are therefore referrable only to
Hadrosauridae indeterminate; H. paucidens is referrable to
Lambeosaurinae indeterminate. Finally, our phylogenetic analysis
indicates that the holotype of H. foulkii belongs to a member of
Euhadrosauria and, tentatively, of Hadrosaurinae.?

    And in the same edition:
Geraldine Garcia, Laurent Marivaux, Thierry Pélissié, and Monique
Vianey-Liaud. 2006. Earliest Laurasian sauropod eggshells. Acta
Palaeontologica Polonica 51 (1): 99-104.

'Megaloolithid eggshells, known from many Cretaceous deposits since 19th
century, are now recognized as remnants of sauropod dinosaurs. Our paper
reports the discovery of megaloolithid egg remains from the Middle
Jurassic (Bajocian) of the Quercy area (southwestern France ). The new
Jurassic ootaxon differs from related Cretaceous oospecies in having
unusually thin shells. Even Megaloolithus aureliensis, the thinnest
Cretaceous megaloolithid from France is three times thicker than the
Jurassic eggshells. The cladistic analysis of ootaxa reveals a peculiar
point in contradiction with the phylogenetic results based on skeletal
remains: the Megaloolithidae belonged to sauropod dinosaurs, which
appear to be the sister group of the hadrosaur eggs (Spheroolithidae
oofamilly). This result could indicate a significant amount of homoplasy
in the evolution of eggshell structures, depending strongly on the
incubation environment (particularly for some characters as
ornamentation, pore openings and pore canals), the reproductive
physiology and the oviduct function. The Bajocian eggshells might
represent the earliest offshoot of the Megaloolithidae oofamily and
represent the earliest sauropod eggshell record known from the deposits
of Laurasia supercontinent.'

    Cheers,

        Christopher Taylor

-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.375 / Virus Database: 267.15.2/251 - Release Date:
4/02/2006