Parataxonomic review of the Upper Cretaceous dinosaur eggshells
Publicado por Leonardo Filippi en 14:03
Mariela
S. Fernández and Ashu Khosla
The eggshell
oospecies from India and Argentina are compared and reviewed in detail. These
eggshells resemble each other in having a nodular outer surface ornamentation
and clearly arched growth lines of the shell units. Microstructurally, the eggshell
oospecies belonging to the oofamily Megaloolithidae shows fan-like shell units,
which are sharply separated from each other throughout the thickness of the
eggshell and can be traced up to the surface of the eggshell. Comparisons
between four oospecies from India and Argentina reveal three groupings, which
show similarities between megaloolithids of both countries: (1) Megaloolithus
jabalpurensis, M. matleyi and M. patagonicus; (2) M. cylindricus, M.
rahioliensis and Tipo 1d; and (3) M. megadermus and Tipo 1e. The other two
types of eggshell oospecies from India and Argentina show partially fused
external nodes and shell units. As a result, growth lines enter into the
adjacent shell units with a marked concavity. A new oogenus Fusioolithus have
been erected due to fusion between shell units and tubospherulitic morphotype,
which include two new oospecies F. baghensis and F. berthei. Till date,
morphostructurally, a total of 15 eggshell oospecies belonging to different
oofamilies have been recorded from India and seven oospecies from Argentina.
Mariela S.
Fernández & Ashu Khosla, Historical Biology (2014): Parataxonomic review of
the Upper Cretaceous dinosaur eggshells belonging to the oofamily
Megaloolithidae from India and Argentina, Historical Biology: An International
Journal of Paleobiology, DOI: 10.1080/08912963.2013.871718.
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Enhorabuena a la Dra. Maru !!! ;)
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