| 释义 |
hydratuba|ˌhaɪdrəˈtjuːbə|
[f. hydra II. 6 + tuba1, formerly Hydra tuba, when the organism was thought to be a species of Hydra; in reference to the shape of the larva.]
The polyp-like larval stage of a jellyfish of the class Scyphozoa; a scyphistoma.
1847J. G. Dalyell Rare & Remarkable Animals Scotl. I. iii. 76 (heading) Hydra tuba, the Trumpet Polypus. Ibid. 77 The body of the hydra tuba is a hollow cone five lines in length, thick and fleshy. 1898A. Sedgwick Student's Text-bk. Zool. I. iv. 159 In the Ephyroninæ the development is generally accompanied by an alternation of generations; the asexual generations being represented by the Scyphistoma (Hydra tuba) and Strobila; but in exceptional cases it is direct (Pelagia). 1901Shipley & MacBride Zool. iii. 64 Each [planula] fixes itself and develops into a little polyp, called a Hydratuba, not unlike a Hydra in appearance. 1927Glasgow Herald 5 Nov. 6/2 This [sc. the larva] settles as a polyp-like form, the hydratuba, and this, by a kind of budding, gives origin to little saucer-like discs which grow into medusæ. 1932Borradaile & Potts Invertebrata v. 155 At certain seasons the whole hydratuba is segmented by transverse horizontal furrows. 1951Microscope VIII. 193 (title) Planula, hydratuba and ephyra stages of the common jellyfish. |