Overview

Comprehensive Description

Description

 Anomia ephippium is an irregularly shaped bivalve with a thin shell, found attached to stones and to other bivalve shells. It is approximatelty circular and up to 60 mm in diameter. The right valve is lowemost and adjacent to the substratum, the left valve is uppermost. It attaches to the substratum by byssal threads though a hole in the right valve. The right valve often takes on an impression of the substratum and this is most obvious when an individual has been attached to a scallop. The edge of the left valve is often shaped to fit exactly onto the substratum. The shell is very thin and brittle, usually white with a blue or pink tinge. The left valve has irregular growth lines on its surface although these can be worn off in older individuals.The four species of saddle oysters are easy to recognise as a group but it can be difficult to separate the species. Anomia ephippium is distinguished from other saddle oysters (Anomiidae) by a line of three muscle scars on the inside surface of the convex valve.
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Source: Marine Life Information Network

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Physical Description

Type Information

Holotype for Anomia ephippium Turton, 1822
Catalog Number: USNM 196087
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
Locality: Locality Unknown
Microhabitat: attached to Fuci
  • Holotype: Conchylia Insularum Britannicarum. pp. 234-235.
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© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Syntype for Anomia ephippium Turton, 1822
Catalog Number: USNM 196082
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
Locality: Locality Unknown
Microhabitat: from the roots of Fuci
  • Syntype: Conchylia Insularum Britannicarum. pp. 233.
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© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Ecology

Habitat

Depth range based on 169 specimens in 1 taxon.
Water temperature and chemistry ranges based on 71 samples.

Environmental ranges
  Depth range (m): 0 - 496
  Temperature range (°C): 2.542 - 17.140
  Nitrate (umol/L): 0.211 - 13.834
  Salinity (PPS): 33.861 - 38.550
  Oxygen (ml/l): 5.381 - 6.852
  Phosphate (umol/l): 0.055 - 0.913
  Silicate (umol/l): 1.247 - 7.130

Graphical representation

Depth range (m): 0 - 496

Temperature range (°C): 2.542 - 17.140

Nitrate (umol/L): 0.211 - 13.834

Salinity (PPS): 33.861 - 38.550

Oxygen (ml/l): 5.381 - 6.852

Phosphate (umol/l): 0.055 - 0.913

Silicate (umol/l): 1.247 - 7.130
 
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 Found from the intertidal to depths of 150 m on rocks , bivalve shells, often scallop shells and algal holdfasts.
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