| 释义 |
urochord Zool.|ˈjʊərəkɔːd|
[f. uro-2 + chord n.]
1. The notochord of ascidians and tunicates, regarded as corresponding to the primordial spinal column in vertebrates.
1877Huxley Anat. Inv. Anim. x. 595 The appendage..may be termed the urochord. Ibid. 598 A ganglion..passes along one side of the urochord to its extremity. 1880A. Wilson in Gentl. Mag. Jan. 46 Among the sea-squirts, the ‘urochord’ persists throughout life.
2. One of the Urochorda, a branch consisting of ascidians or tunicates.
1885F. J. Bell Comp. Anat. 313 Amphioxus has no external skeleton, nor have those Urochords that are tailed throughout life. |