Type species: Pecten bifrons Lamarck 1819.
"Queen Scallop." Shell large, each valve depressedly convex, inequivalve; ears small and subequal, byssal gape small, almost missing, and pectinidial teeth almost obsolete in mature shells, though present in young specimens; seven to nine distant compound ribs have their broad intervals filled with fine radials, and shagreen sculpture; these large ribs are well marked internally but, while with age the superficial ribs have a strong tendency to disappearance, the internal ridges become more pronounced; the right valve is tightly clasped by the left, with the sides open.
Distribution: Australia.