Dyolia n. gen. from the European Miocene-Pleistocene (Protobranchia: Nuculanidae)

Submitted by admin on Sun, 20/11/2011 18:55
RAFAEL LA PERNA
LUCA RAGAINI
(2008)
Volume
39
Part
5
Page from
591

The nuculanids Leda mendax Meneghini in Appelius, 1871, from the Plio-Pleistocene of Italy and Leda reussi Homes, 1865, from the Middle Miocene of Austria, are almost equilateral in shape, not rostrate, with a very shallow pallial sinus and a posterior radial swelling terminating in a rounded postero-ventral projection. Such a combination of shell charac-ters is known only in these two species. For them, Dyolia n. gen. is proposed, with Leda mendax as type species. Relations with other nuculanids and the origin of Dyolia n. gen. are unclear. Taphonomic and morphofunctional observations on Dyolia mendax and D. reussi point to a specialization for muddy, soupy bottoms of the inner shelf, as shallow burrowers.

Keywords
Protobranchia
Nuculanidae
new genus
Neogene
Pleistocene
deposit feeding.