Anomia (genus)

Anomia Temporal range: 270.0–0.0 Ma PreЄ Є O S D C P T J K Pg N Permian to Recent
Two upper valves of Anomia ephippium
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Ostreoida
Family:	Anomiidae
Genus:	Anomia Linnaeus, 1758
species
A. ephippium Linné, 1758 type = A. caepa A. achaeus Gray, 1850 = A. sol A. chinensis Philippi, 1849 A. cytaeum Gray, 1850 A. macostata Huber, 2010 A. peruviana d'Orbigny, 1846 = A. laqueata A. simplex d'Orbigny, 1853 A. trigonopsis Hutton, 1877 A. vancouverensis Gabb, 1869 Cretaceous[1]
Synonyms
Echion Echionoderma Fenestella Röding, 1798, non Fenestella Lonsdale, 1839, a moss animal Operculella

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

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

• A. angulata = Yanishewskiella angulata, brachiopod
• A. biloba = Dicoelosia biloba, brachiopod
• A. bilocularis = Conchidium biloculare, brachiopod
• A. caputserpentis Linné, 1758 = undetermined terebratulid brachiopod
• A. caputserpentis Linné, 1767 = Terebratulina caputserpentis, brachiopod
• A. craniolaris = Crania craniolaris, brachiopod
• A. crispa = Delthyris elegans, brachiopod
• A. detruncata = Megathyris detruncata, brachiopod
• A. furcata = Monia zelandica
• A. nobilis = Monia nobilis
• A. pectinata = Rhynchora pectinata, brachiopod
• A. placenta = Placuna placenta
• A. psittacea = Hemithiris psittacea, brachiopod
• A. reticularis = Atrypa reticularis, brachiopod
• A. retusa Linné, 1758 = Terebratulina caputserpentis, brachiopod
• A. rubra = Kraussia rubra, brachiopod
• A. sella = Placuna quadrangula
• A. squamula = Heteranomia squamula
• A. terebratula = Terebratula terebratula, brachiopod
• A. vitrea = Gryphus vitreus, brachiopod

References

1. 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 http://www.marinespecies.eu/aphia.php?p=taxdetails&id=137650 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.