Paleechinoidea
Pa`le`ech`i`noi´de`a
| n. pl. | 1.(Zool.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini. |
| 单词 | paleechinoidea | ||
| 释义 | PaleechinoideaPa`le`ech`i`noi´de`a
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