| 单词 |
epitokous |
| 释义 |
epitokous, a.|ɛˈpɪtəʊkəs|
[ad. G. epitok (E. Ehlers Die Borstenwürmer (1868) I. 453), f. Gr. ἐπίτοκος fruitful, bearing offspring, f. ἐπί epi- + τόκος birth.]
Of or relating to the epitoke, the posterior sexual part of the body of certain polychætous worms.
1896W. B. Benham in Cambr. Nat. Hist. II. x. 276 Polychaeta... The immature forms may become ripe and lay eggs while still retaining the ‘Nereid’ characteristics, or these immature forms may become ‘Heteronereids’... Ehlers employed the term ‘epitokous’, whilst he called the ‘Nereid’ phase ‘atokous’. 1902Boston Soc. Nat. Hist. XXIX. 399 The Heteronereis (epitokous form of Ehlers) is not uncommon. 1911J. A. Thomson Biol. Seasons iii. 261 In some of our British shore-worms..a remarkable change occurs in the body at the breeding season. So striking is the transformation in some instances, that the breeding (‘epitokous’) phase has been mistaken for a distinct species. 1916H. S. Pratt Man. Invertebr. Anim. 283 In many (Polychæta) the anterior part of the body is sexless and is called the atoke, while the hinder part is sexual and is called the epitoke. 1963R. P. Dales Annelids viii. 165 Durchon has shown that immature worms are prevented from metamorphosing into epitokous individuals by inhibitory hormones produced in the brain. |
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