| 单词 | Sphaeractinoidea |
| 释义 | Sphaeractinoidea [sfir´ak·tǝ`nȯid·ē·ǝ] 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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