ocellus


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Related to ocellus: simple eye, ocelli

o·cel·lus

 (ō-sĕl′əs)
n. pl. o·cel·li (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.

[Latin, diminutive of oculus, eye; see okw- in Indo-European roots.]

o·cel′lar (ō-sĕl′ər) adj.

ocellus

(ɒˈsɛləs)
n, pl -li (-laɪ)
1. (Zoology) the simple eye of insects and some other invertebrates, consisting basically of light-sensitive cells
2. (Biology) any eyelike marking in animals, such as the eyespot on the tail feather of a peacock
3. (Botany) botany
a. an enlarged discoloured cell in a leaf
b. a swelling on the sporangium of certain fungi
[C19: via New Latin from Latin: small eye, from oculus eye]
oˈcellar adj
ocellate, ocellated adj
ˌocelˈlation n

o•cel•lus

(oʊˈsɛl əs)

n., pl. o•cel•li (oʊˈsɛl aɪ)
1. the simple eye of many invertebrates, consisting of retinal cells, pigments, and nerve fibers.
2. an eyelike spot, as on a peacock feather.
[1810–20; < Latin: little eye, diminutive of oculus eye; see -elle]
o•cel′lar, adj.
oc•el•lat•ed (ˈɒs əˌleɪ tɪd, oʊˈsɛl eɪ tɪd) oc•el•late (ˈɒs əˌleɪt, oʊˈsɛl ɪt, -eɪt) adj.

o·cel·lus

(ō-sĕl′əs)
Plural ocelli (ō-sĕl′ī′)
1. A small, simple eye or eyespot, found in many invertebrates.
2. A marking that resembles an eye, as on the wings of some butterflies.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.ocellus - an eye having a single lens
eye, oculus, optic - the organ of sight
ommatidium - any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods
2.ocellus - an eyelike marking (as on the wings of some butterflies)ocellus - an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color
marking - a pattern of marks
Translations
References in classic literature ?
Each ocellus is furnished with its own lid, and the apt can, at will, close as many of the facets of his huge eyes as he chooses.
This eye structure seemed remarkable in a beast whose haunts were upon a glaring field of ice and snow, and though I found upon minute examination of several that we killed that each ocellus is furnished with its own lid, and that the animal can at will close as many of the facets of his huge eyes as he chooses, yet I was positive that nature had thus equipped him because much of his life was to be spent in dark, subterranean recesses.
--Frons with 3-pointed reddish brown mark, with the central point nearly reaching the median ocellus (Fig.
The most notable physical feature used to define hermaphrodites in this species is the presence of a dark black spot (i.e., ocellus) at the dorsal intersection of the caudal peduncle and the caudal fin (Fig.
Measurement Head length with labrum 1.05 Head length to postclypeus 0.96 Head width, maximum at eyes 0.84 Eye diameter, maximum 0.26 Eye to head base, minimum 0.12 Ocellus diameter, maximum 0.05 Pronotum, maximum length 0.61 Pronotum, maximum width 0.77 Total length without wings 5.63 Table 3.
Ophioblennius clippertonensis is a Clipperton Island endemic and 2) lacks a diagnostic character found in the Santa Catalina specimen, a dark ocellus posterior to the eye.
Three small lateral ocelli on each side of the anterior margin of the carapace, 2 larger anterior ocelli in the same horizontal axis, and 1 smaller posterior ocellus situated slightly dorsal to the others; lateral ocelli pattern type 3A (Loria & Prendini 2014).
It shares the striped pattern, but on the rear of the dorsal fin, there is a very prominent ocellus, a false eye.
Eye socketappears large, but only a small portion of the actual eye is preserved and there is a groove above the eye where the lateral ocellus would be found.
terrea (Table 1 : FL); width of fastigium about 1/3 to 1/2 the length of pronotum; fastigium projected forward, flat, horizontal, narrowing toward apex and fusing with the frontal ridge to form a rostrum; frons strongly concave below rostrum; frontal ridge weak, and obsolete below the medial ocellus; eyes globular, slightly longer than wide; antenna fine, filiform, but slightly expanded at the base; antenna longer than the head and pronotum together.
Ocellus near leaf base very large, 2.54x longer than adjacent leaf cells.