Zirfaea crispata (Linnaeus, 1758)Pholadoidea : Pholadidae
Solid, with a small triangular mesoplax.
Inequilateral, beaks in front of midline.
Subrectangular, posterior slightly elongated, roundly subtruncate; anterior beaked with a large pedal gape.
With a median narrow sulcus running almost vertically from beak to ventral margin.
Sculpture: Posterior of median sulcus of co-marginal ridges; anterior with co-marginal ridges and radial riblets with low spines at intersections and giving a denticulate margin around pedal gape. Margin: Inner margin smooth. Hinge: Umbonal reflection raising above umbo anteriorly. Pallial Musculature: Pallial sinus broad, extending to midline. Apophysis long, broad and flat. Periostracum: Periostracum pale brown. Colour: Shell white.
Distribution & Ecology
A borer into soft sedimentary rock, from low in the intertidal to depths of around 10m. Distributed throughout the UK and from Iceland and Norway south to the Bay of Biscay.
Continental Shelf (to 200m)
Juveniles & Similar Species
Key Features & Similar Species
The broad shape and weak median sulcus are distinctive; only juvenile P. loscombiana is at all similar but that species has a thinner shell, is more elongate and does not gape posteriorly.
Listed are literature citing Zirfaea crispata (Linnaeus, 1758). Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
- Conchological Society
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