ocellus

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o·cel·lus

, pl.

o·cel·li

(ō-sel'ŭs, -lī),
1. The simple eye found in many invertebrates. Synonym(s): eyespot (2)
2. Facet of the compound eye of an insect.
[L. dim. of oculus, eye]
Farlex Partner Medical Dictionary © Farlex 2012

ocellus

(ō-sĕl′əs)
n. pl. ocelli (ō-sĕl′ī′)
1. A simple eye, found in many invertebrates, consisting of a number of sensory cells and often a single lens.
2. A marking that resembles an eye, as on the tail feathers of a male peacock; an eyespot.

o·cel′lar (ō-sĕl′ər) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

ocellus

a single eye with a single lens found in insects and some other invertebrates.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
Head yellow pruinose or silvery grey when viewed from certain angles; ocellar setae weak almost not differentiated from ocellar triangle setulae; scutellar dorsum brown with brown pruinosity; calypters yellow with light brown pruinosity; abdomen dark brown in ground colour (or dark brown with sides reddish-brown in one specimen) with tergites 3 and 4 each with irregular band of grey pruinosity on anterior fifth and faint light brown pruinosity posteriorly in posterodorsal view; tergite 5 with yellow pruinosity, denser ventrally; syntergite 1+2, tergites 3 and 4 each with a spot of dense grey pruinosity on midventral margin in posteroventral view.
Face and vertex dull silver pruinose, frons red-gold pruinose, mystax black, ocellar macrosetae black.
3, 4); pale ocellar areas obvious, about half as long as coxae II; surface without scale-like setae but with numerous tubercles densely covering most of surface; with only slight depressions: one along midline, one on each side running from midline to rear of coxae II.
Here we will describe these ocellar structures in detail for the first time and additionally present new TEM observations from Pomatostegus stellatus.
Face, frons and vertex silver pruinose, mystax redbrown, ocellar macrosetae not evident.
Eck (1981) compared color variation, a few morphometric parameters (body size, length of the oculo-malar space, wing and tibia, and form of the ocellar triangle) and number of tyloids of the male antenna, and concluded that D.
Abbreviations used in the descriptions are: F, S, T, OD and PW for antennal flageller segment, metasomal sternum and tergum, ocellar diameter, and puncture diameter, respectively.
Diagnosis.--Ocell-ocular distance about 0.5x lateral ocellus; occipital carina complete; head orangish yellow except mandibles tips, ocellar triangle and occipital carina dark brown; metasoma laterally compressed from apical T3, color of metasomal terga orangish yellow dorsally, ventrally honey yellow.