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

Tyrannosaur play + "hypsilophodont" "setigerous scales" + other papers

Ben Creisler

A number of recent papers (dino and non-dino) not yet mentioned:

Bruce M. Rothschild (2014)
Unexpected behavior in the Cretaceous: tooth-marked bones attributable
to tyrannosaur play.
Ethology Ecology & Evolution (advance online publication)

Attributing behavior in extinct animals is predicated on
identification of anatomy or pathology analogous to that present and
recognized in contemporary animals (Rothschild & Martin 2006). While
Tanke & Currie (1998) noted the difficulty of directly recognizing
dinosaur behavior, one approach is to examine biotic-derived
environmental alternations. For the analysis of utilization of
potential dietary components by theropod dinosaurs, this means
examining the damage they produced in manipulation of carcasses or
bony components thereof. Application of deductive reasoning to tooth
marks on isolated dinosaur bones and fragments excludes the usual
suspects (scavenging and predation), leaving attribution to a behavior
not previously considered. The pattern of bite marks in isolated
bones, and especially in isolated ceratopsian occipital condyles, is
incompatible with feeding activities, but is characteristic of that
found with play by contemporary animals. Deductive reasoning leads to
an alternative explanation to feeding behaviors for isolated,
tooth-marked bones: Tyrannosaurids played with those bones.

This is a quick, rough translation from the original Russian
(improvements and corrections welcome!) The English-language version
is not yet posted.

V.R. Alifanov, S.V. Savelev, E.Y. Tereschenko, V.V. Artemov & A. Yu
Seregin (2014)
Skin structure in ornithischian dinosaurs (Hypsilophodontia,
Ornithopoda) from the Late Jurassic of Transbaikalia.
Paleontological Journal  48 (5):  72-80 (Russian edition)
DOI: 10.7868/S0031031X1405002X

In this paper we describe in detail the structure of the covering of a
dinosaur taxon belonging to the Hypsilophodontia (Ornithopoda) from
deposits in the Ukureisk Formation (Upper Jurassic) at the Kulinda
(Trans-Baikal region, Russia) location. It has been established that
the representatives  of the forementioned group had a type of skin
appendage -- setigerous scales --previously unknown in ornithischian
dinosaurs. The latter are small, embedded in the skin horny plates,
from which emerges at the distal edge a somewhat flattened, long, and
apparently ever-growing strip. Mono-bristle kinds of setigerous scales
presumably may be homologized with protofeathers in theropods, which
in this case is presented in the form of ever-growing and elongated


JI Cheng (2014)
The stratigraphic distribution,migration and phylogeny of the Triassic
Journal of Stratigraphy 38(02): 195-199 (in Chinese)


Triassic sauropterygians mainly lived in nearshore shallow water.They
have a wide distribution along the east and west Tethys while they
were hardly found from the North America(only two genera so
far).During the past fifteen years,many new materials of the Triassic
sauropterygians were found from multiple stratigraphic horizons of the
Triassic of South China,supplementing and also challenging our
traditional knowledge of this group.So far a remarkable contradiction
is still present between the stratigraphic occurrences and phylogeny
in the Triassic sauropterygians and our recent discovery from
Chaohu,Anhui Province does not supported a Western Tethys origin of
the group as suggested by previous research.This is possibly resulted
from the incompleteness of specimens and more new materials are
expected from even older strata of South China and other localities. A
comprehensive revision of all the taxa based on the new materials will
provide us new understanding of the phylogeny of Triassic


Dennis Evangelista, Sharlene Cam, Tony Huynh, Igor Krivitskiy, and
Robert Dudley (2014)
Ontogeny of aerial righting and wing flapping in juvenile birds.
Biology Letters 2014 10 20140497

Mechanisms of aerial righting in juvenile chukar partridge (Alectoris
chukar) were studied from hatching to 14 days-post-hatching (dph).
Asymmetric movements of the wings were used from 1 to 8 dph to effect
progressively more successful righting behaviour via body roll.
Following 8 dph, wing motions transitioned to bilaterally symmetric
flapping that yielded aerial righting via nose-down pitch, along with
substantial increases in vertical force production during descent.
Ontogenetically, the use of such wing motions to effect aerial
righting precedes both symmetric flapping and a previously documented
behaviour in chukar (i.e. wing-assisted incline running) hypothesized
to be relevant to incipient flight evolution in birds. These findings
highlight the importance of asymmetric wing activation and controlled
aerial manoeuvres during bird development and are potentially relevant
to understanding the origins of avian flight.


Vyushkoviana, new chronosuchian

(Again, this is a quick, rough translation from Russian--improvements
and corrections are welcome!)

M. A. Shishkin, I. V. Novikov, and Zh. Fortuni (2014)
A new bystrowianid chronosuchian (Amphibia, Anthracosauromorpha) from
the Triassic of Russia and features of the diversification of the
Paleontological Journal 48 (5) : 60-71 (Russian edition)
DOI: 10.7868/S0031031X14050092

The first representatives  of the Bystrowianidae (Amphibia,
Chroniosuchia) - Vyushkoviana operta gen. et sp. nov. and Dromotectum
abditum sp.nov.--are described from the Gamian Horizon of the Lower
Triassic of the East European platform, encountered in the basins of
the Northern Dvina River and Little Don River. Features of the
evolution of axial dermal scutes of  bystrowianids allow a division
into the subfamilies Bystrowianinae Vjuschkov, Dromotectinae subfam.
nov. and Axitectinae subfam. nov., of which the last two show a
progressive reduction of the external (axial) zone  interscutularis
joint. The new data are in favor of the unity or continuity in the
structural plans of the osteoderms found on chroniosuhid and
bystrowianid; the idea of the paraphyletic status of the first of
these groups is rejected. The evolutionary significance of the key
features that define the differences between bystrowianid subfamilies
is analyzed.