| 单词 |
sphaeractinoidea |
| 释义 |
Sphaeractinoidea Sphaeractinoidea[sfir‚ak·tə′nȯid·ē·ə] (paleontology) An extinct group of fossil marine hydrozoans distinguished in part by the relative prominence of either vertical or horizontal trabeculae and by the presence of long, tabulate tubes called autotubes. |
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