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

Nanobamus, new temnospondyl and other non-dino items

From: Ben Creisler

A number of new non-dino items that may be of interest to some:

Nanobamus, new amphibamid on page 60 in:

Rainer R. Schoch and Andrew R. Milner (2014). Handbook of
Paleoherpetology. Part 3A2. Temnospondyli I. Verlag Dr. Friedrich
Pfeil. pp. 150 pp. ISBN 978-3-89937-170-3.

No other details available. I have not seen the book and the sample
preview pages do not include the description.


Chang-Fu Zhou, Márton Rabi and Walter G Joyce (2014)
A new specimen of Manchurochelys manchoukuoensis from the Early
Cretaceous Jehol Biota of Chifeng, Inner Mongolia, China and the
phylogeny of Cretaceous basal eucryptodiran turtles.
BMC Evolutionary Biology 14:77  (advance publication)

open access pdf:

Abstract (provisional)
Manchurochelys manchoukuoensis is an emblematic turtle from the
Cretaceous Yixian Formation of Liaoning, China, a geological rock unit
that is famous for yielding perfectly preserved skeletons of fossil
vertebrates, including that of feathered dinosaurs. Manchurochelys
manchoukuoensis was one of the first vertebrates described from this
fauna, also known as the Jehol Biota. The holotype was lost during
World War II and only one additional specimen has been described
since. Manchurochelys manchoukuoensis is a critical taxon for
unraveling the phylogenetic relationships of Cretaceous pancryptodires
from Asia, a group that is considered to be of key importance for the
origin of crown-group hidden-neck turtles (Cryptodira).

A new specimen of Manchurochelys manchoukuoensis is described here
from the Jiufotang Formation of Qilinshan, Chifeng, Inner Mongolia,
China. This is the third specimen described and expands the range of
this taxon from the Yixian Formation of the Fuxin-Yixian Basin in
Liaoning to the Jiufotang Formation of the Chifeng-Yuanbaoshan Basin.
A possible temporal extension of the range is less certain. The new
finding adds to our understanding of the morphology of this taxon and
invites a thorough revision of the phylogeny of Macrobaenidae,
Sinemydidae, and closely allied forms.

Our comprehensive phylogenetic analyses of Cretaceous Asian
pancryptodires yielded two main competing hypotheses: in the first
these taxa form a paraphyletic grade, whereas in the second they form
a monophyletic clade. The inclusion of problematic tree changing taxa,
such as Panpleurodires (stem + crown side-neck turtles) has a major
influence on the phylogenetic relationships of Sinemydidae and closely
allied forms. Manchurochelys manchoukuoensis nests within Sinemydidae
together with Sinemys spp. and Dracochelys bicuspis in the majority of
our analyses.


Beatriz Chamero, Ángela D. Buscalioni, Jesús Marugán-Lobón and Ioannis
Sarris (2014)
3D Geometry and Quantitative Variation of the Cervico-Thoracic Region
in Crocodylia.
The Anatomical Record (advance online publication)
DOI: 10.1002/ar.22926

This study aims to interpret the axial patterning of the crocodylian
neck, and to find a potential taxonomic signal that corresponds to
vertebral position. Morphological variation in the cervico-thoracic
vertebrae is compared in fifteen different crocodylian species using
3D geometric morphometric methods. Multivariate analysis indicated
that the pattern of intracolumnar variation was a gradual change in
shape of the vertebral series (at the parapophyses, diapophyses,
prezygapohyses, and postzygapohyses), in the cervical (C3 to C9) and
dorsal (D1-D2) regions which was quite conservative among the
crocodylians studied. In spite of this, we also found that
intracolumnar shape variation allowed differentiation between two sub
regions of the crocodylian neck. Growth is subtly correlated with
vertebral shape variation, predicting changes in both the vertebral
centrum and the neural spine. Interestingly, the allometric scaling
for the pooled sample is equivalently shared by each vertebra studied.
However, there were significant taxonomic differences, both in the
average shape of the entire neck configuration (regional variation)
and by shape variation at each vertebral position (positional
variation) among the necks. The average neck vertebra of crocodylids
is characterized by a relatively cranio-caudally short neural arch,
whereby the spine is relatively longer and pointed orthogonal to the
frontal plane. Conversely, the average vertebra in alligatorids has
cranio-caudally longer neural spine and arch, with a relatively
(dorso-ventrally) shorter spine. At each vertebral position there are
significant differences between alligatorids and crocodylids. We
discuss that the delayed timing of neurocentral fusion in
Alligatoridae possibly explains the observed taxonomic differences.


Romain Vullo, Dominique Abit, Michel Ballèvre, Jean-Paul
Billon-Bruyat, Renaud Bourgeais, Éric Buffetaut, Véronique
Daviero-Gomez, Géraldine Garcia, Bernard Gomez, Jean-Michel Mazin,
Séverin Morel, Didier Néraudeau, Joane Pouech, Jean-Claude Rage,
Johann Schnyder & Haiyan Tong (2014)
Palaeontology of the Purbeck-type (Tithonian, Late Jurassic) bonebeds
of Chassiron (Oléron Island, western France).
Comptes Rendus Palevol (advance online publication)

The paralic flora and fauna from the Late Jurassic of Chassiron
(Oléron Island, western France) are described. The Tithonian-aged
bonebeds of Purbeck facies of this locality have yielded a rich and
diverse vertebrate assemblage including fishes, amphibians, reptiles
and mammals, alongside numerous plant and invertebrate remains. The
Chassiron locality thus appears as a peculiar Konzentrat-Lagerstätte
in which most of the palaeoecosystem's biological components (both
aquatic and terrestrial) have been preserved. The depositional
environment was probably subject to salinity fluctuations, as
indicated by the co-occurrence of freshwater and euryhaline organisms.
This is one of the richest localities and the first mammal-bearing
site known from the Jurassic of France.