ocellus

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ocellus

(pl. ocelli): see eyeeye,
organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many other
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ocellus

[ō′sel·əs]
(invertebrate zoology)
A small, simple invertebrate eye composed of photoreceptor cells and pigment cells.
(petrology)
A phenocryst in an ocellar rock.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Structure: head and compound eyes slightly large; ocelli absent.
Head, antennal segments, labial segments excluding fourth, entire pronotum, scutellum, corium and clavus, connexiva, venter of abdomen, legs except claws are dull ochraceous, with thick brown punctures; eyes brown, ocelli yellow with reddish tinge; 4th labial segment dark; claws ochraceous brown; membrane of hemelytra brown with dark veins.
Polychaetes have a surprising abundance of photoreceptors, ocelli, or eyes distributed across their bodies (Purschke, 2005; Purschke et al., 2006).
Vertex flat, lacking ocelli. Occiput conically convex, with distinct median and lateral longitudinal furrows.
palmatoides, differing from it by the diameter of ocelli, being smaller than the ocelli-ocular distance in A.
(Female) Head transverse; occiput straight, with rounded juxta-ocular elevations; ocelli minute in the female in broad triangle, facial scutellum transverse, eyes rounded.
Head: Arista bare; clypeus strongly convex, entirely microsetulose; palpus parallelsided, densely microsetulose, with a few small setulae, but lacking outstanding setae; lower frons flat, projecting slightly anterior to eyes, supra-antennal shelf distinct; frontal vitta with small, elevated area restricted to upper 1/2; lower 1/2 of frons flat with straight margin; 2 pairs of fronto-orbital setae, posterior pair usually at or behind level of ocelli. Thorax: Legs cylindrical, without longitudinal grooves on tibiae or femora; tarsomere 1 of foreleg white, longer than remaining tarsomeres combined; postpronotum with a few minute setulae only; 1 distinct dorsocentral seta, 2 notopleural setae, 1 supra-alar and 1 postalar seta.
The octopus Octopus mimus has been described previously to have a faint ocelli, which can be observed when the animal is alive (Guerra et al.
Late October usually signals the arrival of the smaller Gulf flounder, the ones called "three spot" flounder because of the three ringed ocelli on their upper sides.
henryz), diffuse shoulder marking, numerous dark spots on dorsal surface of head, and pair of closely spaced dark post-cephalic ocelli surrounded by white halo (H.