Abstract
A new species, Policordia hispida, is described and compared with three similar species: Policordia densicostata (Locard, 1898); Policordia pilula (Pelseneer, 1911) and a yet un-described species, Policordia sp. (= Policordia pilula sensu Ivanova, 1977 not Pelseneer, 1911). This is a first record for the genus in the Californian province.
Highlights
Like other lyonsiellids, the genus Policordia Dall, Bartsch & Rehder, 1938 (Bivalvia, Lyonsiellidae) comprises specialized carnivorous bivalves widely distributed in the world’s oceans
Policordia is characterized by having a small thin fragile shell with an external sculpture consisting of very fine commarginal growth lines and radial threads
The new species was assigned to the genus Policordia on the basis of conchological features
Summary
The genus Policordia Dall, Bartsch & Rehder, 1938 (Bivalvia, Lyonsiellidae) comprises specialized carnivorous bivalves widely distributed in the world’s oceans. Policordia is characterized by having a small thin fragile shell with an external sculpture consisting of very fine commarginal growth lines and radial threads. It lacks hinge teeth (Coan et al 2000). Specimens conchologically similar to the type species of the genus (Policordia diomedea Dall, Bartsch & Rehder, 1938) were collected from two separate sites off the coast of southern California. These are the first records of the genus from the Californian Marine Province (Coan et al 2000).
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