| 释义 |
ˈafter-shaft Ornith.
[tr. mod.L. hyporachis.]
= hyporachis.
1867W. S. Dallas tr. Nitzsch's Pterylography I. i. 8 The aftershaft originates from the underside of the feather beneath the umbiliciform pit. 1871T. H. Huxley Man. Anat. Vertebr. Anim. vi. 274 In very many birds each quill bears two vexilla; the second, called aftershaft (hyporachis), being attached on the under side of the first close to the superior umbilicus. 1884E. Coues Key N. Amer. Birds (ed. 2) 84 The after-shaft, when well developed, is like a duplicate in miniature of the main feather, from the stem of which it springs, at junction of calamus with rhachis, close to the umbilicus. |