单词 | nectophore |
释义 | nectophoren. Zoology. In some siphonophores: a zooid which has a swimming bell but lacks a manubrium (and usually tentacles and sense organs), and which contracts rhythmically to propel the colony through the water. Also called nectocalyx. ΚΠ 1901 Amer. Naturalist 35 594 Those [sc. Siphonophora] more familiar and of commoner record may be grouped under the following sections: A. Disconectæ. Siphonophora with discoidal pneumatophore, but devoid of nectophores or bracts... B. Calcyonectæ. Siphonophora without pneumatophore, but with one or more nectophores. 1956 Limnol. & Oceanogr. 1 308/1 The nectophore, from which most generic and specific descriptions..have had to be made, is a complex gelatinous sack shaped like a prism, a helmet, or a flattened truncate or rounded bell. 1987 R. D. Barnes Invertebr. Zool. (ed. 5) v. 111/2 Locomotion is also brought about by swimming bells, or nectophores, which are mouthless, pulsating medusae. 1992 Philos. Trans. (Royal Soc.) B. 335 281 The two types of nectophore previously ascribed to N[ectopyramis] spinosa are actually the larval nectophores of two other species. This is a new entry (OED Third Edition, September 2003; most recently modified version published online March 2022). < n.1901 |
随便看 |
|
英语词典包含1132095条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。