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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: Pteriomorphia
Ordo: Pectinida
Superfamilia: Anomioidea
Familiae: Anomiidae - Placunidae
The Anomioidea are a superfamily of marine bivalve molluscs that include two families, the Anomiidae and the Placunidae, the jingle shells and saddle shells. They are mainly sessile bivalves that superficially resemble true oysters (partially in that they cement themselves to a substrate). Though they are pleurothetic, however, the Anomioidea attach via their right valve rather than the usual left.[2] Their irregular shells are inequilateral, are round to oval, with a large byssal notch. The byssus itself is usually short and plug-like. The left valve is convex, and the hinge is considered edentulous.[3]

MolluscaBase (2019). MolluscaBase. Anomioidea Rafinesque, 1815. Accessed through: World Register of Marine Species at: on 2019-03-04
Peter Graham Oliver (1992). Bivalved seashells of the Red Sea. Hemmen. p. 85. ISBN 978-3-925919-08-4.
Eugene V. Coan; Paul Valentich Scott; F. R. Bernard (2000). Bivalve seashells of western North America: marine bivalve mollusks from Arctic Alaska to Baja California. Santa Barbara Museum of Natural History. p. 253. ISBN 978-0-936494-30-2.

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