Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Bivalvia
Subclassis: Heterodonta
Ordo: Myoida
Familiae: Corbulidae - Erodonidae - Gastrochaenidae - Hiatellidae - Myidae - Pholadidae - Spheniopsidae - Teredinidae
Name
Myoida Goldfuss, 1820
Myida (formerly Myoida) is an order of saltwater and freshwater clams, marine and freshwater bivalve molluscs in the subclass Heterodonta. The order includes such bivalves as soft-shell clams, geoducks and shipworms.
Description
They are burrowing molluscs with well-developed siphons. The shell is relatively soft and lacks a nacreous layer. Some species have a single cardinal tooth.[1]
Superfamilies and families
Superfamilies and families within the Myida include:[2]
Superfamily: Dreissenoidea
Family: Dreissenidae
Superfamily: Myoidea
Family: Corbulidae
Family: Myidae
Family: †Pleurodesmatidae
Family: †Raetomyidae
Superfamily: Pholadoidea
Family: Pholadidae
Family: Teredinidae
Family: Xylophagaidae
Superfamily: †Pleuromyoidea
Family: †Ceratomyidae
Family: †Pleuromyidae
Family: †Vacunellidae
References
Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, PA: Holt-Saunders International. p. 431. ISBN 0-03-056747-5.
"WoRMS - World Register of Marine Species - Myida". www.marinespecies.org. Retrieved 2019-04-03.
Powell A W B, New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
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