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单词 protocercal
释义

> as lemmas

protocercal
protocercal adj.
Brit. /ˌprəʊtə(ʊ)ˈsəːkl/
,
U.S. /ˌproʊdoʊˈsərk(ə)l/
,
/ˌproʊdəˈsərk(ə)l/
Zoology (in fishes) of, relating to, or designating a tail of a primitive (or larval) type, in which the end of the vertebral column is straight and the caudal fin is symmetrical and often continuous with the dorsal and anal fins; cf. heterocercal adj., homocercal adj.
ΚΠ
1863 Philos. Trans. (Royal Soc.) 153 46 Transformation passing through the protocercal and usually the heterocercal stages.
1892 J. A. Thomson Outl. Zool. xx. 403 The end of the notochord in the tail is quite straight (protocercal and diphycercal).
1984 Paleobiology 10 293 Recent lungfishes have protocercal tails, suppression of endochondral ossification and greatly reduced fin rays.
extracted from proto-comb. form
<
as lemmas
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