Glycymeris glycymeris (Linnaeus, 1758)
Arcoidea : Glycymerididae
To size: To 65mm. Shell Structure: Thick, robust. Equivalve: Equivalve. Equilateral: Appears equilateral but beaks just behind the midline. Tumidity: Not tumid. Outline: Subcircular, some with a distinct angular posterior margin, umbos low; dorsal margin short, straight; posterior a little more acute than anterior but both broadly rounded. Lateral margins in juvenile more straight. Contour: Dorsal area narrow, cleft; Evenly rounded.
Sculpture: Indistinct but of very numerous fine incised radial grooves cut by equally numerous comarginal lines and growth stops. Smaller shells appear ribbed and cancellate. Margin: Crenulate. Ligament: Duplivincular, strong, set on both sides of the beak. Hinge: Very strong, taxodont; teeth in two series separated by a small edentulous space set on an arched hinge plate, up to 12 teeth in each series. Pallial Musculature: Anterior adductor scar slightly larger than posterior. Periostracum: Pilose, of brown, dense, short hairs arising from radial grooves, usually persists only at margins. Colour: Mostly maculated white and brown, some more densely shades of brown all over; interior white or brown – purplish brown inside pallial line.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Key Features & Similar Species
Arcoidea : Glycymerididae
Listed are literature citing Glycymeris glycymeris (Linnaeus, 1758). Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
Thomas R D K 1975. Functional morphology, ecology, and evolutionary conservatism in the Glycymerididae (Bivalvia). Palaeontology. 18: 217–258.
Thomas R D K 1978. Shell Form and the Ecological Range of Living and Extinct Arcoida. Paleobiology. 4(2): 181-194.
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