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Taxon profile

species

Flat Macoma
Macoma moesta (Deshayes, 1855)

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Bivalvia - bivalves »  order Cardiida »  family Tellinidae »  genus Macoma

Scientific synonyms

Macoma oneilli Dall, 1919

Images

Macoma moesta - Flat Macoma

Author: Dall, W.H.

Taxon in country check-lists*

Arctic, Alaska, North America: Canada

* List of countries might not be complete

Description

Macoma oneilli: Shell small, thin, oval, compressed, inequilateral, slightly inequivalve, the anterior part more than twice as long as the part behind the umbones; white covered with a dehiscent yellowish-olive periostracum; beaks hardly perceptible, ligament prominent, posterior end with an extremely narrow compressed dorsal margin corresponding to the fold of most species; anterior and posterior ends subequally rounded; dorsal and basal margins nearly equally arcuate; interior chalky white, the hinge with two small but well-marked teeth in each valve, the anterior left cardinal bifid; pallial sinus rounded behind, coalescent below, a little smaller in the right valve than in the other; muscular impressions subequal and of moderate size. Length of shell 21; length in front of the vertical from the beaks 15; height 15; diameter 6 mm.
Dall W.H. (1919). The Mollusca of the Arctic coast of America collected by the Canadian Arctic expedition west from Bathurst Inlet with an appended report on a collection of Pleistocene fossil Mollusca.

Interchangeable taxa

Macoma oneilli: This species is remarkable for its evenly oval shape and flattened valves, devoid of the usual posterior twist. Among the various species of Macoma in the Arctic seas it approaches nearest to M. moesta Deshayes, but is quite distinct.
Dall W.H. (1919). The Mollusca of the Arctic coast of America collected by the Canadian Arctic expedition west from Bathurst Inlet with an appended report on a collection of Pleistocene fossil Mollusca.

Distribution

Macoma oneilli: Canada. Dredged in Dolphin and Union Strait in 30 to 50 fathoms, mud and pebbles.
Dall W.H. (1919). The Mollusca of the Arctic coast of America collected by the Canadian Arctic expedition west from Bathurst Inlet with an appended report on a collection of Pleistocene fossil Mollusca.
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Macoma moesta Deshayes, 1855]
Data retrieved on: 23 November 2013

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