Morphologic Description: Carapace subquadrate, smooth or reticulate, with distinct dorsal and ventral ridges and subcentral tubercle; no caudal process. Hinge hemiamphidont, with denticulate median element; antennal muscle scar double. Line of concrescence and inner margin coincident, marginal pore canals simple, widened in middle. Sexual dimorphism recorded. [Cythere arata Brady, 1880] (Treatise, Q336, fig. 260:4).
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