“Boring Clam” (Tridanca corcea)

Also known as the Crocus Clam, Corcea Clam or Saffron-coloured Clam, Tidanca corcea is a species of Tridacnid clam that is widely distributed throughout the west Pacific. Like most bivalves boring clams are filter feeders and will siphon nutrients from the water around them. Despite what its common name might suggest Tridanca corcea is actually quite interesting and will bore itself into hard substrates to keep itself affixed.


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Image: Line1


Fluted Giant Clam (Tridacna squamosa)

Also sometimes known as the scaly clam, the fluted giant clam is a species of “giant clam” (Tridacnidae) which occurs in shallow coral reefs throughout the South Pacific and Indian Oceans. T. squamosa can be distinguished from other members of the genus by its large “leaf-like” edges on its shell known as ‘scutes’. It is also noted for having a relatively small byssal opening when compared to other Tridacnids. Despite their size like other bivalve species fluted giant clams are sessile filter feeders. 


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Image(s): Nhobgood

Bear Paw Clam (Hippopus hippopus)

Also known as the horse’s hoof clam or strawberry clam, the bear paw clam is a species of large clam in the “giant clam family” (Tridacnidae). Hippopus hippopus occurs in coral reefs along a large part of the South Pacific ocean and part of the Indian Ocean. Like most clams H. hippopus is a sessile filter feeder.


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Image: Rikaris

“Fat Gaper” (Tresus capax)

Also known as the horse clam (a name it shares with Tresus nuttallii as well) Tresus capax is a species of saltwater Mactrid clam that inhabits the Pacific coast of North America, ranging from California north to Alaska. Tresus capax typically inhabits intertidal areas and will bury itself in sand, mud, and gravel substrates. Like most bivalves T. capax is a filter feeder and will filter the water around itself for nutrients.  T. capax is also known to hold a relationship with the small pea crab Pinnixa faba which will enter the bivalve through its large siphon and live inside its mantle cavity.


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Image: Minette Layne

Warty Venus (Venus verrucosa)

…a species of saltwater “venus clam” (Veneridae) which is distributed along the European coast and also the southern African coast, from Namibia to Mozambique. Warty venuses occupy the subtidal zone, where they will burrow into the mud/sand with only their siphons exposed, allowing them to filter feed.


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Image: Hans Hillewaert