Feb 7, 2017 · The findings necessitate the removal of U. caffer from the nominal genus Cafferia Simpson, for which it is the type species, and its return to the genus Unio Philipsson, in the Unionidae: Unioninae.

Bivalvia (/ baɪˈvælviə /) or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half- …

Dec 18, 2017 · The term parivincular was introduced by Dall (1895, p. 500) to describe the C-spring type of ligament found in Cardium, Tellina, Unio, Mytilus, and Volsella (fig. 4A-C). Some of the areas (fig. 4D) also have a parivincular ligament in the adult stage; probably all of the areas pass through a parivincular stage somewhere in the ontogeny.

Jan 1, 1976 · The findings necessitate the removal of U. caffer from the nominal genus Cafferia Simpson, for which it is the type species, and its return to the genus Unio Pbilipsson, in the Unionidae:...

Dec 1, 2017 · Ostracum—In many kinds of pelecypods, such as Aviculopectinidae, Unio, Pteria, there are two separate layers constituting the ostracum or shell proper. The outer layer is commonly prismatic or homogeneous and will be termed the outer ostracum.

ABSTRACT-A unionid pelecypod from the Burro Canyon formation of Colorado is assigned, as Nippononaia asinaria, to a genus hitherto reported only from Japan. It is unlike recorded American forms.

Nov 25, 2016 · Fordilla troyensis Barrande is the earliest known pelecypod representatives and comes from Early Cambrian rocks (513–520 Ma) of North America, Greenland, Europe, the Middle East and Asia. Genus Fordilla contains three species, F. germanica, F. sibirica, and the type species F. troyensis.

The commonest species in England is the Swan Mussel (Anodonta cygnea). The types commonly dissected in India are Unio and Lamellidens marginalis. The description that follows will apply in general to almost any freshwater mussel.

Jan 1, 1980 · Here, we studied the micro- and nanostructure, the mineralogy and composition of a nacroprismatic bivalve species: Unio pictorum.

Dec 18, 2017 · Representatives of the pelecypod superfamily Mytilacea are among the most diverse, most abundant, and best preserved of Paleozoic pelecypods. Among these the myalinids are of particular interest because of the remarkable shell beds formed by their remains.