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Animal of large size, reaching 115 mm in examined specimens. Body dark bluish-grey, broad-oval, slightly carinated, rather flat. Valves flattened to moderately carinated. Anterior valve sligthtly convex, semicircular, with wide V-shaped to straight posterior margin unnotched in middle, with numerous radially arranged, shallow ribs; intermediate valves rectangular with slightly concave posterior margin at both sides of faintly protruding apex, lateral areas slightly elevated, sculptured with up to 5 radial ribs between a wider diagonal ridge and a very wide posterior rib; tail valve semicircular with an anterior mucro; post-mucronal area with same sculpture as head valve and lateral areas (After Schwabe et al. 2006). According to Osorio (2002), this species can reach a maximum length of 174 mm.


Creative Commons Attribution 3.0 (CC BY 3.0)

© Juan Francisco Araya, Marta Esther Araya

Source: Zoosystematics and Evolution

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