Philobryidae is a
taxonomicfamily of very small equivalved triangular saltwater clams,
marinebivalvemolluscs, related to the
ark clams and the
bittersweets. Their shells have projecting
umbones and are non-
nacreous. The ligament of the hinge is either completely internal or only slightly external. They have only one adductor muscle scar on the inside of each of their shells as opposed to the more-common two. Species from this family are found in most
seas, in shallow to moderately deep water. This family contains about sixty species in seven genera.