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

Undulatoolithus, new form of dinosaur egg from China



From: Ben Creisler
bcreisler@gmail.com

A new paper in Zootaxa:

QIANG WANG, ZIKUI ZHAO, XIAOLIN WANG, NING LI & SONGLIN ZOU (2013)
A new form of Elongatoolithidae, Undulatoolithus pengi oogen. et oosp.
nov. from Pingxiang, Jiangxi, China.
Zootaxa 3746(1): 194-200
doi: http://dx.doi.org/10.11646/zootaxa.3746.1.9
Preview pdf:
http://www.mapress.com/zootaxa/2013/f/z03746p200f.pdf

http://zoobank.org/urn:lsid:zoobank.org:pub:E6F80E2A-D60B-43B7-97CF-C2A7D2C1B327


A new oogenus and oospecies of the Elongatoolithidae, Undulatoolithus
pengi oogen. et oosp. nov., is described on the basis of specimens
from the Upper Cretaceous Zhoutian Formation of the Pingxiang Basin,
Jiangxi Province, China. The eggs are slightly asymmetrical, paired,
and lay radially-oriented in a circular configuration within the
clutch, and most suggestive of Macroolithus of the Elongatoolithidae
by medium-sized eggs with average polar axis and equatorial diameter
of 19.36 and 8.35 cm, and the ornamentation pattern of nodes and
ridges on the outer surface. The new oogenus differs from Macroolithus
in its prominent ridges 0.67 mm in height, about half of the entire
eggshell thickness, gradational boundary between the cone layer and
the overlying columnar layer, cone layer-to-columnar layer thickness
ratio of 1/8 or 1/4. This discovery adds new data on the morphology
and diversification of Late Cretaceous elongatoolithid ootaxa.