Heteroconchia

Heteroconchia is a taxonomic infraclass of diverse bivalve molluscs, belonging to the subclass Autobranchia.

This infraclass includes the cockles, Venus clams, the freshwater mussels, brooch clams, as well as Heterodonta and Archiheterodonta.

Description

These bivalves are distinguished by having the two halves of the shell equally sized (i.e., they are equivalved) and having a few cardinal teeth separated from a number of long lateral teeth. Their shells lack a nacreous layer, and the gills are lamellibranch in form. Most species have a siphon.

Orders and families

The following tree is their info which has been updated with the latest information from the World Register of Marine Species:

Infraclass: Heteroconchia

• Unclassified family: †Lipanellidae
• Subterclass: Archiheterodonta Order: †Actinodontida Superfamily: †Amnigenioidea Family: †Amnigeniidae Family: †Montanariidae Family: †Zadimerodiidae Superfamily: †Anodontopsoidea Family: †Actinodontidae Family: †Anodontopsidae Family: †Baidiostracidae Family: †Cycloconchidae Family: †Intihuarellidae Family: †Redoniidae Superfamily: †Nyassoidea Family: †Nyassidae Superfamily: †Oriocrassatelloidea Family: †Crassatellopsidae Family: †Oriocrassatellidae Superfamily: †Palaeomuteloidea Family: †Palaeomutelidae Order: Carditida Unclassified family: †Archaeocardiidae Unclassified family: †Eodonidae Superfamily: Carditoidea Family: †Cardiniidae Family: Carditidae Family: Condylocardiidae Superfamily: Crassatelloidea Family: †Aenigmoconchidae Family: Astartidae Family: Crassatellidae Family: †Myophoricardiidae
• Subterclass: Euheterodonta Unassigned Euheterodonta Superfamily: †Babinkoidea Superfamily: †Orthonotoidea Superorder: Anomalodesmata Superfamily: Clavagelloidea Family: Clavagellidae Family: Penicillidae Superfamily: Cuspidarioidea Family: Cuspidariidae Family: Halonymphidae Family: Protocuspidariidae Family: Spheniopsidae Superfamily: Myochamoidea Family: Cleidothaeridae Family: Myochamidae Superfamily: Pandoroidea Family: Lyonsiidae Family: Pandoridae Superfamily: Pholadomyoidea Family: †Arenigomyidae Family: †Margaritariidae Family: Parilimyidae Family: Pholadomyidae Family: †Ucumariidae Superfamily: Poromyoidea Family: Cetoconchidae Family: Poromyidae Superfamily: Thracioidea Family: †Burmesiidae Family: Clistoconchidae Family: Laternulidae Family: Periplomatidae Family: Thraciidae Superfamily: Verticordioidea Family: Euciroidae Family: Lyonsiellidae Family: Verticordiidae Superorder: Imparidentia Unassigned Imparidentia Unassigned Family: †Palaeocarditidae Superfamily: Cyamioidea Family: Cyamiidae Family: Galatheavalvidae Family: Sportellidae Superfamily: Gaimardioidea Family: Gaimardiidae Superfamily: †Grammysioidea Family: †Grammysiidae Family: †Sanguinolitidae Superfamily: †Kalenteroidea Family: †Kalenteridae Order: Adapedonta Superfamily: †Edmondioidea Family: †Edmondiidae Family: †Pachydomidae Superfamily: Hiatelloidea Family: Hiatellidae Superfamily: Solenoidea Family: Pharidae Family: Solenidae Order: Cardiida Superfamily: Cardioidea Family: Cardiidae Family: †Pterocardiidae Superfamily: Tellinoidea Family: Donacidae Family: †Icanotiidae Family: Psammobiidae Family: †Quenstedtiidae Family: Semelidae Family: Solecurtidae Family: †Sowerbyidae Family: †Tancrediidae Family: Tellinidae Family: †Unicardiopsidae Order: Galeommatida Superfamily: Galeommatoidea Family: Basterotiidae Family: Galeommatidae Family: Lasaeidae Order: Gastrochaenida Superfamily: Gastrochaenoidea Family: Gastrochaenidae Order: †Hippuritida (rudists) Suborder: †Hippuritidina Superfamily: †Caprinoidea Family: †Antillocaprinidae Family: †Caprinidae Family: †Caprinuloideidae Family: †Ichthyosarcolitidae Superfamily: †Radiolitoidea Family: †Caprinulidae Family: †Caprotinidae Family: †Diceratidae Family: †Hippuritidae Family: †Monopleuridae Family: †Plagioptychidae Family: †Polyconitidae Family: †Radiolitidae Family: †Trechmannellidae Suborder: †Requieniidina Superfamily: †Requienioidea Family: †Epidiceratidae Family: †Requieniidae Order: Lucinida Superfamily: Lucinoidea Family: Lucinidae Family: †Mactromyidae Family: †Paracyclidae Superfamily: Thyasiroidea Family: Thyasiridae Order: †Megalodontida Superfamily: †Mecynodontoidea Family: †Beichuaniidae Family: †Congeriomorphidae Family: †Mecynodontidae Family: †Plethocardiidae Family: †Prosocoelidae Superfamily: †Megalodontoidea Family: †Ceratomyopsidae Family: †Dicerocardiidae Family: †Megalodontidae Family: †Pachyrismatidae Family: †Wallowaconchidae Order: †Modiomorphida Superfamily: †Modiomorphoidea Family: †Cypricardiniidae Family: †Hippopodiumidae Family: †Modiomorphidae Family: †Palaeopharidae Family: †Tusayanidae Order: Myida Superfamily: Dreissenoidea Family: Dreissenidae Superfamily: Myoidea Family: Corbulidae Family: Myidae Family: †Pleurodesmatidae Family: †Raetomyidae Superfamily: Pholadoidea Family: Pholadidae Family: Teredinidae (shipworms) Family: Xylophagaidae Superfamily: †Pleuromyoidea Family: †Ceratomyidae Family: †Pleuromyidae Family: †Vacunellidae Order: Sphaeriida Superfamily: Sphaerioidea Family: †Neomiodontidae Family: Sphaeriidae Order: Venerida Superfamily: †Anthracosioidea Family: †Anthracosiidae Family: †Ferganoconchida Family: †Shaanxiconchidae Superfamily: Arcticoidea Family: Arcticidae Family: †Pollicidae Family: Trapezidae Family: †Veniellidae Superfamily: Chamoidea Family: Chamidae Superfamily: Cyrenoidea Family: Cyrenidae Family: Cyrenoididae Family: Glauconomidae Superfamily: Glossoidea Family: Glossidae Family: Kelliellidae Family: †Lutetiidae Family: Vesicomyidae Superfamily: Hemidonacoidea Family: Hemidonacidae Superfamily: Mactroidea Family: Anatinellidae Family: Cardiliidae Family: Mactridae Family: Mesodesmatidae Superfamily: †Palaeanodontoidea Family: †Palaeanodontidae Superfamily: †Prilukielloidea Family: †Prilukiellidae Family: †Senderzoniellidae Superfamily: Ungulinoidea Family: Ungulinidae Superfamily: Veneroidea Family: †Isocyprinidae Family: Neoleptonidae Family: Veneridae
• Subterclass: Paleoheterodonta Unassigned Family: Lyrodesmatidae Unassigned Family: Pseudarcidae Unassigned Family: Thoraliidae Order: Unionida Unassigned Genus †Araripenaia Unassigned Family †Pachycardiidae Superfamily Etherioidea Superfamily †Silesunionoidea Superfamily †Tamesnelloidea Superfamily Unionoidea Order: Trigoniida Superfamily †Megatrigonioidea Superfamily Myophorelloidea Superfamily Pseudocardinioidea Superfamily Trigonioidea Superfamily Trigonioidoidea Superfamily Trigonodoidea
• Subterclass: Heterodonta