| 释义 |
gastrozooid Zool.|gæstrəʊˈzəʊɔɪd|
Also gastero-.
[f. gastro- + zooid n.]
A nutritive zooid in colony-forming Hydrozoa and Thaliacea.
1879H. N. Moseley in Phil. Trans. R. Soc. CLXIX. 429 In all Stylasteridæ two forms of zooids are present. One form has a mouth and gastric cavity, the other is devoid of these and has a purely tentacular function. For the former the term ‘gastrozooid’ is here adopted, and for the latter that of ‘dactylozooid’. 1932Borradaile & Potts Invertebrata v. 147 The manubrium has come to lie outside the medusa bell as the gastrozooid. Ibid. xix. 608 These [buds] of the lateral row become gasterozooids which gather food for the community. 1961Encycl. Brit. XII. 3/2 In certain colonies [sc. of polyps and medusæ], such as those of Millepora and Hydractinia.., the hydranths are not all alike. Some of them (gastrozooids) possess mouths as well as tentacles. 1967E. J. W. Barrington Invert. Struct. & Function xxi. 449 The differentiation of the colonial polyps into gastrozooids, concerned with feeding, and gonozooids (blastozooids) concerned with reproduction. |