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Chionoecetes opilio
''Chionoecetes opilio'', also known as snow crab, is a predominantly epifaunal crustacean native to shelf depths in the northwest Atlantic Ocean and north Pacific Ocean. It is a well-known commercial species of ''Chionoecetes'', often caught with traps or by trawling. Male ''C. opilio'' with a total length above long are the most commonly trapped, especially around Canada and Newfoundland. This crab genus is found across northern parts of the Atlantic and Pacific oceans. There are seven species in the genus ''Chionoecetes'', all of which bear the name "snow crab." ''Chionoecetes opilio'' is also related to ''Chionoecetes tanneri'', commonly known as the tanner crab, and other crab species found in the cold, northern oceans.
== Anatomy ==
Snow crabs have equally long and wide carapaces, or protective shell-coverings, over their bodies. Their tubercles, or the bodily projections on their shell, are moderately enclosed in calcium deposits, and they boast hooked setae, which are rigid, yet springy, hair-like organs on their claws. Snow crabs have a horizontal rostrum at the front of the carapace; the rostrum is basically just an extension of the hard, shell covering of the carapace and it boasts two flat horns separated by a gap. They have triangular spines and well-defined gastric and branchial regions internally. Snow crabs also have little granules along the border of their bodies, except their intestinal region. Concerning their walking legs, their first three are compressed; their chelipeds, or pincers, are usually smaller, shorter, or equal to their walking legs. Snow crab are iridescent and range in color from brown to light red on top and from yellow to white on the bottom,〔 and are bright white on the sides of their feet.
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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