Anomia (genus)

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Temporal range: 270.0–0.0 Ma
Permian to Recent
Anomia ephippium.jpg
Two upper valves of Anomia ephippium
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Pectinida
Family: Anomiidae
Genus: Anomia
Linnaeus, 1758

Anomia is a genus of saltwater clams, marine bivalve mollusks in the family Anomiidae. They are commonly known as jingle shells because when a handful of them are shaken they make a jingling sound,[2] though some are also known as saddle oysters.[3]

This genus first appeared in the Permian period of China, Italy, and Pakistan.[4] Anomia species are common in both tropical and temperate oceans and live primarily attached to rock or other shells via a calcified byssus that extends through the lower valve.[1] Anomia shells tend to take on the surface shape of what they are attached to; thus if an Anomia is attached to a scallop shell, the shell of the Anomia will also show ribbing. [1]

Reassigned species[edit]

As Anomia was erected very early in paleontology, several species have been reassigned; most of them are now recognized as brachiopods.[5][6]


  1. ^ a b c Ludvigsen, Rolf & Beard, Graham. 1997. West Coast Fossils: A Guide to the Ancient Life of Vancouver Island. pg. 109
  2. ^ Gofas, S. (2010) Anomia Linnaeus, 1758. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at on 2010-06-06
  3. ^ "Saddle oyster - Anomia ephippium". The Marine Life Information Network. 
  4. ^ Paleobiology database entry on Anomia
  5. ^ Moore, R.C., ed. (1965). Brachiopoda. Treatise on Invertebrate Paleontology. Part H., Volume 1 and 2. Boulder, Colorado/Lawrence, Kansas: Geological Society of America/University of Kansas Press. ISBN 0-8137-3015-5. 
  6. ^ Moore, R.C.Paleontological Institute (ed.). Part N, Mollusca 6, vol. 1 & 2. Treatise on Invertebrate Paleontology. Retrieved 5 December 2013.