Morphologic Description: Carapace varying in shape, hemicytheroid, elongate - oval or subquadrate, reticulate. Eye tubercle interrupts regular arch formed by anterior marginal and anterodorsal ridges, the latter of which fuses in anterodorsal region with frontal keel. Hinge amphidont. Three frontal muscle scars. Dorsomedian and ventromedian adductor scars divided. Vestibule inconspicuous or absent (Porkorný, 1969).
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