| 单词 |
glochidium |
| 释义 |
glochidium|gləʊˈkɪdɪəm|
Pl. -idia |-ˈɪdɪə|.
[mod.L.: see glochidiate.]
1. The larva of a pond-mussel of the family Unionidæ. Also attrib.
1875Huxley & Martin Elem. Biol. 110 There is a single adductor muscle and a rudimentary foot, from which one or two long structureless filaments, representing the byssus of the sea-mussel, proceed. These byssal filaments become entangled with one another and tend to keep the ‘Glochidia’ in their places. 1888Rolleston & Jackson Forms Anim. Life 137 This Glochidium is eventually set free from the parent. 1930G. R. de Beer Embryol. & Evol. 44 The Glochidium larva of Unio. 1961P. Street Shell Life on Seashore v. 78 Many fresh-water fish serve as hosts to these fresh-water glochidia.
2. Bot. (See quot. 1900.) (Also ˈglochid.)
1882S. H. Vines tr. Sach's Text-bk. Bot. (ed. 2) ii. 454 In some species [of Azolla] these massulæ have their surfaces covered with hair-like appendages, barbed at their free ends (Glochidia). 1889Bennett & Murray Handbk. Cryptogamic Bot. i. 30 In some species..the surface of these masses is covered with hair-like appendages, barbed at the apex, the glochids. 1900B. D. Jackson Gloss. Bot. Terms, Glochid, glochidium.., (1) a barbed hair or bristle; (2) a similar structure on the massulae of certain Cryptogams which act as organs of attachment to a macrospore. 1905D. H. Campbell Struct. & Devel. Mosses & Ferns (ed. 2) xi. 417 Upon the outside of the massulæ are formed the curious anchor-like ‘glochidia’. 1938G. M. Smith Cryptogamic Bot. II. ix. 360 Massulae of species belonging to the section Rhizosperma lack glochidia. 1965Bell & Coombe tr. Strasburger's Textbk. Bot. iii. 582 Arising from the surface of each massula are a number of small, barbed hooks or glochidia. |
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