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, pl.


(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]


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.


a single eye with a single lens found in insects and some other invertebrates.
References in periodicals archive ?
Face and vertex dull silver pruinose, frons red-gold pruinose, mystax black, ocellar macrosetae black.
3 times broader than long; inner orbits of compound eyes subparallel; malar area about as long as median ocellar diameter; clypeus about 3.
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.
Female: ocellar triangle short, with a triangular shape not reaching lunule (Fig.
Frons concave and tapering towards the ocellar plate; anterior margin not concave nor projected between antennal bases (Fig.
36 X head width; 5-6 frontal setae; reclinate orbital setae strong; proclinate fronto orbital setae small and weak; inner vertical setae strong and reclinate, outer vertical setae absent; ocellar triangle black, with one pair of proclinate ocellar setae; postocular setae black; genal groove and anterior half of genal dilation with golden microtomentum; posterior half of genal dilation and postgena with gray microtomentum and pale setae, gena with black setae; face black with gray microtomentum; facial ridge black with gray microtomentum, with setae and setulae close to vibrissa; 3-2 subvibrissal setae; antenna reddish, first flagellomere 1.
Frons and ocellar area shiny, densely and finely punctate; vertex shiny, sparsely, finely punctate.
Abbreviations used in the descriptions are: F, S, T, OD and PD for antennal flagellomere, metasomal sternum and tergum, ocellar diameter, and puncture diameter, respectively.
Unfortunately, the head of the paratype deposited in the Senckenberg Museum is tilted forward such that the length of the ocellar setae cannot be measured accurately, in contrast to the Hood holotype and the specimens slide mounted in London.
Scanning motion, ocellar morphology and orientation mechanisms in the phototaxis of the nematode Mermis nigrescens.
halophila (Duda) ocellar triangle entirely microtomentose and weakly glossy; scutum largely microtomentose (widespread in Europe; Mongolia) 3'.