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Turtle egg from Cretaceous of Brazil



Ben Creisler
bcreisler@gmail.com


A new paper:

Júlio C. de a. Marsola, Gerald Grellet-Tinner, Felipe C. Montefeltro &
Max C. Langer (2014)
The first Pan-Podocnemididae turtle egg from the Presidente Prudente
Formation (Late Cretaceous, Bauru Group), Brazil.
Zootaxa 3872 (2): 187–194
doi:  http://dx.doi.org/10.11646/zootaxa.3872.2.5
Preview:
http://www.mapress.com/zootaxa/2014/f/z03872p194f.pdf



Pan-Podocnemididae turtles are ubiquitous in Late Cretaceous rocks of
the Bauru Group in southeastern Brazil. This group of side-necked
turtles is particularly abundant in a turtle-bearing site of the
Presidente Prudente Formation known as Tartaruguito. Here, we describe
the first turtle egg (LPRP-USP 0052) from the Tartaruguito site.
LPRP-USP 0052 is nearly complete but misses a pole and measures 5,1
and 2,9–2,2 centimeters due to its flattened minor axis. The egg
morphology and microstructure were analyzed by observations performed
with CT, Optic Microscopy, Scanning Electronic Microscopy and Wave
Dispersion Energy analyses. The eggshell ranges from 145 to160
micrometers thick. Considering the matching morphology of the new
specimen and its provenance from the stratigraphic horizon that
yielded only the podocnemidids Bauruemys and Roxochelys, it is most
likely that LPRP-USP 0052 was produced by a podocnemidid turtle.