单词 | Saccammina |
释义 | Saccamminanoun Sac·cam·mi·na səˈkamənə, saˈk- : a genus of foraminiferans having a thick arenaceous test often in the shape of a pear, spindle, or sphere, having survived from the Ordovician to the present time, and making up with their remains various Carboniferous strata |
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