The Cretaceous crab Rathbunopon : revision , a new species and new localities
نویسنده
چکیده
The crab genus Rathhunopon is exclusively known from Cretaceous rocks, mainly from Europe. Here two new European localities are presented: one in the Albian/Cenomanian of northern Spain yielding well-preserved specimens of Rathhunopon ohesum, and one from the lower Aptian at the German-Austrian border yielding Rathhunopon schrattenkalkensis n. sp. Both are found in association with coral reefs. Based upon a revision of the genus, we place Rathhunopon within the Prosopidae. Furthermore, Homolopsis tuherculata is transferred to Rathhunopon. Placement of 'Rathhunopon' atherfieldensis in Rathhunopon is not tenable; we place it here within the Homoloidea in open nomenclature. With the addition of R. tuherculatum, Rathhunopon is interpreted to have evolved in the Hauterivian and diversified in the Albian/Cenomanian. Whereas R. ohesum resided mainly in reefal settings, Rathhunopon species lived in a variety of environments and are suggested to be generalists.
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