| 单词 |
protopterygian |
| 释义 |
protopterygian, a. Ichth.|ˌprəʊtəʊptəˈrɪdʒɪən| [f. Gr. πρωτο- proto- + πτερύγιον fin + -an.] Introduced by Ryder to designate the first-fin stage when the embryonic fin rays first appear.
1884Rep. U.S. Comm. Fish. (1886) 987 The protopterygian stage of development of the permanent fin-rays. |

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