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Theropod eggshells from Cretaceous of Spain



From: Ben Creisler
bcreisler@gmail.com

A new online paper:



Miguel Moreno-Azanza, José I. Canudo, and José M. Gasca (2013)
Unusual theropod eggshells from the Early Cretaceous Blesa Formation
of the Iberian Range, Spain.
Acta Palaeontologica Polonica (in press)
doi: http://dx.doi.org/10.4202/app.2012.0069
http://app.pan.pl/article/item/app20120069.html




Trigonoolithus amoae oogen. et oosp. nov. is described on the basis of
abundant eggshell fragments from the La Cantalera site in the Late
Cretaceous (early Barremian) Blesa Formation, Teruel Province,
northern Spain. The surface ornamentation, the most diagnostic feature
of the new oogenus, consists of closely spaced sub-triangular or
rounded protuberances that have not previously been reported in any
other ootaxon. The eggshells present three distinct layers, with a
gradual transition between prismatic and mammillary layers, and a
poorly developed external layer with progressive prismatic to external
layer transition, a combination of characters that allows them to be
assigned to Prismatoolithidae. Phylogenetic analyses based on
oological characters place Trigonoolithus at the base of
Prismatoolithidae.