Morphologic Description: Carapace bilamellar, in lateral view roughly ovoid, with oblique caudal process that points obliquely upward (commonly drawn out strongly) and pointed ventrolateral winglike processes, which may be feebly developed; RV slighly larger than LV, overlapping it distinctly along hinge length; surface smooth or ornamented; no eye tubercles. Inner margin and line of concrescence coincident, apart from presence of narrow vestibule at front middle; RV hinge with terminal notched tooth plates united by crenulated furrow; marginal pore canals few, separated widely, undivided, some grouped in two's and three's; normal pore canals open; four subvertically arranged, elongated adductor muscle scars with V-shaped scar in front of dorsal end of adductor row, and small round scar inside V. Sexual dimorphism present but not pronounced. [Cythere latissima Norman, 1865] (Treatise, Q292, figs. 219:1, 220:5).
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