NMITA: Neogene Marine Biota of Tropical America 

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Argilloecia Sars, 1866.

Morphologic Description: Subelliptical, nearly cylindrical in cross section; mid-portion of shell somewhat flattened; posterior margin truncated; RV slightly larger than LV inner lamellae typically very broad. Sexual dimorphism marked, males much smaller and more elongated than females. [Argilloecia cylindrica Sars, 1966] (Treatise, Q247, fig. 182:1).

Species:

• A. vespa Bold, 1988.

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