| 释义 |
‖ ocellus|əʊˈsɛləs|
Pl. ocelli |-aɪ|.
[L. ocellus little eye, dim. of oculus eye.]
1. A little eye or eyelet; spec.
a. One of the simple, as distinct from the compound, eyes of insects and some other Arthropoda, etc.; a stemma.
b. The simple or rudimentary eye or visual spot of Mollusca, Hydrozoa, and other animals.
c. One of the facets or segments of a compound eye. (Nearly always used in pl.)
1819G. Samouelle Entomol. Compend. 273 Ocelli or stemmata not distinct. 1828Stark Elem. Nat. Hist. II. 319 Longilabra..Two ocelli; antennæ always filiform. 1863Bates Nat. Amazon I. 31 They [the workers among the Saiiba ants] have in the middle of the forehead a twin ocellus, or simple eye, of quite different structure from the ordinary compound eyes, on the sides of the head. 1869H. Ussher in Eng. Mech. 3 Dec. 271/3 Catch your fly..and with a lens you will see his ocular organ divided into numerous facets or ocelli. 1879Lubbock Sci. Lect. iii. 88 In most ants..There are generally three ocelli arranged in a triangle on the top of their heads, and on each side a large compound eye. 1879G. Allen Colour Sense iii. 27 The simplest form in which they [visual organs] occur is that of the ocelli among naked-eyed Medusæ.
2. A coloured spot surrounded by a ring or rings of different colour, as found on some feathers, butterflies' wings, etc.; an eye-like spot, an eyelet.
1826Kirby & Sp. Entomol. IV. 286 Ocellus, an eye-like spot in the Wings of many Lepidoptera, consisting of annuli of different colours, inclosing a central spot or pupil. 1871Darwin Desc. Man I. xi. 397 The lower surface is magnificently ornamented by an ocellus of cobalt-blue. Ibid. II. xiv. 132. 1879 Cassell's Techn. Educ. IV. 39/2 A clear ocellus in each of the four wings. |