Atrina seminuda

Atrina seminuda, or the half-naked pen shell, is a species of bivalve mollusc in the family Pinnidae. ==DescripciĆ³n== It is characterized by a large shell between about 150-200 mm in triangular or wedge, the leaflets have ornamentations forming rows 10-20 tubular radial spiny projections which are often slightly curved. The surface of the leaflet...
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