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Spondylus americanus
''Spondylus americanus'', the Atlantic thorny oyster, is a species of bivalve mollusc in the family Limidae. It can be found along the Atlantic coast of North America, ranging from North Carolina to Brazil.〔Abbott, R.T. & Morris, P.A. ''A Field Guide to Shells: Atlantic and Gulf Coasts and the West Indies.'' New York: Houghton Mifflin, 1995. 33.〕
==Description==
The Atlantic thorny oyster can grow to in diameter. The valves of the shell are roughly circular and the upper one is decorated with many spiny protuberances up to long. When growing in a crevice, the shape of the shell adapts itself to the available space.〔 The colour varies but is usually white or cream with orange or purplish areas making it well camouflaged. The lower valve is flat and is attached to the substrate. When the living animal is lying on the seabed it is usually not visible because of the algae, marine animals and sediment that cover the shell. The flat tree oyster and Lister's tree oyster are often among these epibionts. A diver swimming past may just observe a slight movement on the seabed as the oyster snaps its valves shut. Young animals are much less spiny than adults and resemble members of the genus Chama, the jewelbox clams.
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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