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Corculum cardissa
''Corculum cardissa'' or the heart cockle is a species of marine bivalve mollusc in the family Cardiidae. It is found in the Indo-Pacific region. It has a symbiotic relationship with dinoflagellates (zooxanthellae), which live within its tissues.〔
==Description==
The two valves of ''Corculum cardissa'' are unequal in size and often asymmetric. Their shape is very variable but viewed from above, the outline is roughly heart shaped which gives the molluscs their common name.〔 Viewed from the side the shape bears a resemblance to the shell of a cockle (''Cerastoderma'' spp.). In some specimens the posterior valve is nearly flat or has a slight hump. In others it is more rounded.
The boundary of the valves is usually flat but is sometimes somewhat sinuous. Smaller shells tend to be elongated; larger shells are more rounded and the growth rings can be seen clearly. The shell is thin and translucent, particularly the upper side. There is an intricate mosaic pattern of more and less transparent white regions. The lower valve has a mainly white surface with a few transparent regions. The gills and mantle, especially the lower siphon, are dark brown owing to the presence of microscopic algae. The outer surface of the mantle also contains granules of reddish, purple and blue pigment.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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