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Calveriosoma gracile
''Calveriosoma gracile'' is a species of sea urchin in the order Echinothurioida. It is a deep water species and is found on the seabed in western parts of the Pacific Ocean at depths of .
== Description ==
''Calveriosoma gracile'' grows to a diameter of about and is scantily covered in short spines. It has a somewhat flattened globose shape resembling a cushion. It is one of a group of echinoderms that instead of having a rigid test consisting of fused calcareous plates, has a flexible leathery skin with loose, wedge-shaped plates embedded in it. This makes the boundaries between the plates easy to observe. Other distinguishing characteristics include hollow spines tipped with hoof-like structures and simple mouthparts. Echinoderms in this order were known only as fossils having been found in deposits such as the chalk beds of southern England dating back to the Cretaceous era. It was only in the ''Challenger'' expedition of the 1870s that living members of the group were found, when deep ocean floors were dredged to investigate the organisms living at these great depths.
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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