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Micraster

資料來源 : pyDict

小蛸枕屬

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Micraster \Mi*cras"ter\, n. [NL., fr. Gr. mikro`s small + ?
   star.] (Paleon.)
   A genus of sea urchins, similar to Spatangus, abounding in
   the chalk formation; -- from the starlike disposal of the
   ambulacral furrows.
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