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Calyptogena magnifica
''Calyptogena magnifica'' is a species of giant white clam found clustered around hydrothermal vents at abyssal depths in the Pacific Ocean.
==Description==
The systematics of the family Vesicomyidae is unclear because of the small number of specimens collected, the variability between specimens of the same species and their wide dispersal in isolated, deep water locations. The morphology of ''Calyptogena magnifica'' resembles another member of the genus, ''Calyptogena elongata'', the type locality of which is several hundred miles further north. ''C elongata'' is only known from three small specimens and the size of mature individuals is unknown.〔
The two valves of ''Calyptogena magnifica'' are oval or slightly kidney-shaped and about two times as long as they are high. The umbones are towards the anterior end of the valve and the growth rings are most noticeable near the margins. The shell material is thick and the exterior is white and usually chalky in appearance. The periostracum is yellowish brown, wrinkled and loose. The ligament is external and there are several U-shaped cardinal hinge teeth on each valve. The largest specimen so far collected has a valve length of . The mantle is an iridescent purplish pink and there is a large pink protrudible foot divided into two portions. The two separate siphons are short and do not extend beyond the edge of the valves. The pallial sinus is small. The gills are large and thick and the visceral mass is red due to the haemoglobin in the blood.
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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