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Overview

Brief Summary

The blunt gaper is closely related to the sand gaper, but is smaller. Compared to the sand gaper, it looks slightly misshaped, as if it got stuck somewhere. The shells are notably truncated at one side. The life-style of the blunt gaper is more or less identical to the sand gaper. You sometimes find fossilize dark gray shells of the blunt gaper on a Dutch beach.
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Comprehensive Description

Description

 The shell of Mya truncata can reach 7.5 cm in length, the anterior end is regularly rounded whilst the posterior end is abruptly blunt (truncated) with a large gape. The right valve is more convex than the left. The outer surface of the bivalve is off-white, and the outer layer of the shell (periostracum) is variable in colour from light olive to dark brown. The hinge of the left valve of the shell has a conspicuous spoon-shaped projection (chondrophore), to which the internal and external ligament is attached. The shell beaks are slightly posterior and directed inwards and touching. The pallial sinus is broad and deep with the lower margin irregularly confluent with the pallial line.Mya truncata is smaller than Mya arenaria, with a blunt posterior end. The posterior of Mya arenaria is rounded.
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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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Distribution

Circumboreal
  • Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford, UK. ISBN 0-19-857356-1. 627 pp.
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Source: World Register of Marine Species

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Arctic seas to Nahant, Massachusetts; Europe; Arctic seas to Washington; Japan
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Physical Description

Type Information

Holotype for Mya praecisa Gould, 1850
Catalog Number: USNM 5886
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
Locality: "Oregon", Washington, United States, Puget Sound, North Pacific Ocean
  • Holotype:
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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

bathyal, infralittoral and circalittoral of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Depth range based on 210 specimens in 1 taxon.
Water temperature and chemistry ranges based on 62 samples.

Environmental ranges
  Depth range (m): 0 - 193
  Temperature range (°C): -1.071 - 23.720
  Nitrate (umol/L): 0.501 - 14.768
  Salinity (PPS): 27.165 - 36.080
  Oxygen (ml/l): 4.807 - 7.830
  Phosphate (umol/l): 0.081 - 1.345
  Silicate (umol/l): 0.805 - 25.127

Graphical representation

Depth range (m): 0 - 193

Temperature range (°C): -1.071 - 23.720

Nitrate (umol/L): 0.501 - 14.768

Salinity (PPS): 27.165 - 36.080

Oxygen (ml/l): 4.807 - 7.830

Phosphate (umol/l): 0.081 - 1.345

Silicate (umol/l): 0.805 - 25.127
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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 Mya truncata burrows at considerable depths in mixed sand, sandy mud, or gravel substrata from the lower shore to about 70 m depth.
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Source: Marine Life Information Network

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Molecular Biology and Genetics

Molecular Biology

Genomic DNA is available from 1 specimen with morphological vouchers housed at British Antarctic Survey
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© Ocean Genome Legacy

Source: Ocean Genome Resource

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Wikipedia

Mya truncata

Mya truncata, common name the "blunt gaper", is a species of edible saltwater clam, a marine bivalve mollusk in the family Myidae.

Gallery

References

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