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Thoracocare
''Thoracocare'' is a minute to very small (1.7 – 3.6 mm long) trilobite, that lived during part of the Middle Cambrian in what are today the states of Idaho, Nevada and Utah. It is the only trilobite known with just two thorax segments outside most members of the Agnostida order. It can be distinguished from Agnostida by the very wide subquadrate glabella (about half the cephalon), parallel-side or widening forward in the largest specimen, with the full front side touching the border. Two species are known, one, ''T. idahoensis'', only from pygidia. == Etymology == ''Thoracocare'' is derived from the Greek θώραξ, thorax, meaning breastplate and akares, meaning short.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Thoracocare」の詳細全文を読む
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