| 单词 | opercular bone |
| 释义 | > as lemmasopercular bone Zoology. The hindmost and largest of the bones of the operculum of a fish. Formerly also: †the splenial bone in the lower jaw of reptiles and some other tetrapods (obsolete). More fully opercular bone.See note at operculum n. 1b. ΘΚΠ the world > animals > animal body > general parts > [noun] > lid or cover coverclea1682 opercular1841 1841 G. E. Mantell in Philos. Trans. (Royal Soc.) 131 132 These bones, as seen in the Iguana..consist of the dentary (a) which supports the teeth; the opercular (b); the complementary (c); [etc.]. 1882 Philos. Trans. (Royal Soc.) 173 161 In the face it will not be difficult to seize upon the true meaning of certain ichthyic bones, namely the ‘operculars’. 1947 Jrnl. Animal Ecol. 16 188/2 The use of polarized light often clarified the rings on the operculars, and..the width of these rings could easily be measured. 1997 G. S. Helfman et al. Diversity of Fishes iii. 26/1 The hyomandibula is an inverted L-shaped bone that connects the lower jaw and opercular bones to the neurocranium. < as lemmas |
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