ocellus


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Related to ocellus: simple eye, ocelli
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  • noun

Synonyms for ocellus

an eye having a single lens

an eyelike marking (as on the wings of some butterflies)

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References in periodicals archive ?
2 Notauli posteriorly joint, or separated, but very close, with minimum distance between notauli shorter than half of posterior ocellus breadth; head and scutum dull, granulated ridens Olmi 2
2D) greyish with blues streak or 2-3 blue dots on each scale; remnants of bright blue bands on snout and forehead and numerous blue spots and narrow blue lines on side of head; dark-edged green spot on upper rear edge of operculum; remnant of ocellus on rear portion of dorsal fin; narrow blue to white stripe on dorsal and anal fin margins, as well as submarginal blue stripes.
25 times longer than OOL; posterior ocellus separated from inner orbit of eye by 2.
2C: 1br); eye subglobular; ocellus small, situated close to eye: distance between eye and ocellus about one third as long as interocellar distance.
The 30 mm SL juvenile has a broad basicaudal bar, an ocellus, completely dark anal and first dorsal fins, darkish body, a pale caudal peduncle and the head is uniform except for a narrow cheek mark, all characters unlike any Apogonichthyoides miniatus of similar size.
Compound eye surrounded by several hyaline lenses, ocellus slightly smaller than eye.
The results (both equal and successive weighting analyses) support the monophyly of Heterostylum based on 4 unambiguous synapomorphies: row of setae on the ocellar tubercle separating the anterior ocellus from the others (character 1); row of setae on the anterodorsal surface of femur III (character 10, state 1); veins M1 and R5 merging near or at the point where R4 arises (character 13, state 1); and sperm pump longer than spermathecae (character 25, state 1); and one ambiguous synapomorphy: head as wide as or wider than thorax (character 7, state 1).
Fastigium of vertex wide, median ocellus as large as or slightly larger than antennal sockets, lateral ocelli small.
For head ratios: the head length and height were measured in lateral view, respectively, from the tip of the frons through the posterior occiput, and from the ocelli through the bottom edge of the subgena; the head width, frons width, and frons length were measured in dorsal view, with head width measured through the widest part, frons width through the anterior ocellus and a second measurement through the top of the lunule, and frons length from the anterior ocellus to the anterior edge of the frons.
1B, C): Anteocular region slightly shorter than postocular; anteocular gently narrowing towards the apex, postocular strongly convex to midpoint posteriorly forming a narrow collum; eye nearly hemispherical, not reaching dorsal or ventral margin of head in lateral view, slightly protruding laterally in dorsal view; postocular sulcus deep, curved, situated at level of posterior margin of eye; ocellus relatively large, equidistant to eye and other ocellus, located on large tubercle; antenniferous tubercle with cuticle flat, without spines.
Frons with conspicuous arcuated lateral carinae extending at the base of torulus until near central ocellus (Figure 6, see arrow), interantennal carina distinct.
There are a few small brown spots on the head and anterior body within the pale interspaces and the characteristic large ocellus is evident, although partially merged with the second dark bar.
Frontal costa prominent, gently expanding between the antennae, flat with scattered impressed punctae from median ocellus to clypeus and shallowly concave between the lateral carina; a dark spot below median ocellus and above antennae (Fig.
22 Frons broad, distance of vertical seta to lateral ocellus longer than distance between lateral ocelli (Fig.