Class Bivalvia Linnaeus, 1758 - bivalves Subclass Autobranchia Grobben, 1894 Superorder Pteriomorphia Beurlen, 1944 Order Mytilida Férussac, 1822 Superfamily †Modiolopsoidea Fischer, 1886 1 Family †Modiolopsidae Fischer, 1886 2 Family †Colpomyidae Pojeta & Gilbert-Tomlinson, 1977 3 Family †Saffordiidae Scarlato & Starobogatov, 1979