Atrina fragilis (Pennant, 1777)
Pinnoidea : Pinnidae
Thin but strong, horny.
Strongly inequilateral, beaks at the anterior end.
Triangular, dorsal margin long and straight, posterior broad, gently curved but often damaged; ventral margin slightly sinuous.
Posterior margins gape; small byssus gape at anterior ventral.
Sculpture: Of comarginal lines and 8-12 low radiating ribs over the dorsal part of the shell, these ribs obscure or lost in large shells. Margin: Inner margin smooth with a few septa at the anterior tip. Ligament: External on a narrow resilifer extending 2/3 length of dorsal margin. Hinge: Lacking teeth. Pallial Musculature: Anterior adductor scar small at the anterior end behind the septa, posterior adductor scar large almost central; nacreous area not divided confined to anterior part of shell. Periostracum: Obscure. Colour: Shades of brownn.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
The two species: Atrina fragilis and A. pectinata are geographically isolated - fragilis is European and pectinata from Indo-Pacific - and each is included in a different subgenus; fragilis in Atrina and pectinata in Servatrina.
Pinnoidea : Pinnidae
Listed are literature citing Atrina fragilis (Pennant, 1777). Reference containing the species Type Description is highlighted.
Hanley S 1855. The shells of Linnaeus (Ipsa Linnaei Conchylia) Williams and Norgate, London.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
Pennant T 1777. British Zoology vol.IV. Crustacea, Mollusca, Testacea London, B. White. 154pp, 93pls.
Rosewater J 1961. The family Pinnidae in the Indo-Pacific. Indo-Pacific Mollusca. 1 (4): 501-632.
- Conchological Society
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