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Mollusca (Molluscs e.g. snails, slugs, mussels, cockles & clams)
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Pelecypoda (Bivalves e.g. clams, cockles, mussels, oysters, and scallops)
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Pteroidea ()
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Pinnacea (Fan mussels)
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Atrina
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fragilis
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W1733 |
| Pinna fragilis, Pinna pectinata, |
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- Large (30-48 cm in length by half that wide), triangular, thin and fragile shell tapering to a point.
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Shell with conspicuous concentric growth and disturbance lines with 8-12 low, smooth, wavy ridges radiating from the beaks (umbones) .
- Occasional fluted spines.
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Shell colour light yellow-brown to darker brown or chestnut in colour.
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Inside of shell glossy (partly nacreous) with very dissimilar muscle scars, largest scar in middle of shell valve.
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Valves gape at posterior (broad) end.
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Byssus fine and abundant.
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Shell margin smooth but often fragmented at posterior end.
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Lives with pointed anterior end embedded in muds, sandy mud or gravel, attached to small stones or shell fragments by byssus with between one or two thirds of the shell below the sediment surface.
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