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Tresus capax
Biology
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Literature Cited
Common name(s): Horse clam, Gapper clam
Size:
Up to 180mm
Range:
Gulf of Alaska to Central California
Habitat:
Muddy sand, dense sand, silty sand and gravel in protected bays. Burrows down to 60 cm. Intertidal to 30 m.
Misidentification:
Tresus nuttallii, Mya arenaria, Panope abrupta
Life History:
Spawning occurs when the water begins to warm up and may spawn more than once in a season. T. capax may live up to 12 years. This species commonly hosts the commensal pea crab, Fabia subquadrata, in southern Puget Sound.
Predators:
Polinices lewisii, Cancer magister, Pisaster spp.
Additional Resources:
*"Size" refers to shell length only and only gives the largest average size for the given species.
Last updated Tuesday, August 29, 2006, by Lisa Ferrier
