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Arthropterygius (Ichthyosauria) from Late Jurassic of Argentina



From: Ben Creisler
bcreisler@gmail.com


A new online paper:


Marta S. Fernández & Erin Maxwell (2012)
The genus Arthropterygius Maxwell (Ichthyosauria: Ophthalmosauridae)
in the Late Jurassic of the Neuquén Basin, Argentina.
Geobios (advance online publication)
http://dx.doi.org/10.1016/j.geobios.2012.02.001
http://www.sciencedirect.com/science/article/pii/S0016699512000678?v=s5

Recent discovery of a skull and forefin of an ophthalmosaurid
ichthyosaur from the Tithonian (Late Jurassic) of the Neuquén Basin,
Argentina, shows a peculiar morphology of the braincase and forefin,
including the opening for internal carotids situated on the posterior
surface of the parabasisphenoid and dorsoventral compression of the
posterior part of the humerus. These characteristics appear unique
within ophthalmosaurids, and probably within Ichthyosauria, and are
diagnostic of the genus Arthropterygius, a taxon to date only known
from the Oxfordian-Kimmeridgian of Northwest Territories of Canada.
The new finding increases the knowledge of this peculiar
ophthalmosaurid and represents, up to the present, the first evidence
for a potentially widespread and climatically diverse distribution of
this rare genus