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ocelli
Book article from: A Dictionary of Zoology
ocelli See OCELLUS .
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ocellus
Book article from: A Dictionary of Zoology
ocellus (pl. ocelli) A simple eye , which has a single, thickened, cuticular lens. The epithelial cells below the lens are transparent, and below them there are many light-sensitive nerve cells.
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ocellar
Book article from: A Dictionary of Zoology
ocellar Applied to the region on the frons (see CLYPEUS ) of the head of an insect that bears the ocelli (see OCELLUS ). This includes an approximately triangular area (the ocellar triangle) and may bear ocellar bristles.
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Ceratopogonidae
Book article from: A Dictionary of Zoology
...small to minute, gnat-like flies, in which the males have plumose antennae, the head is not concealed by the thorax , and ocelli are absent. The short mouth-parts are of a piercing type. All adults of this family are predatory, sucking blood or eating...
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Bibionidae
Book article from: A Dictionary of Zoology
...segments and are usually shorter than the thorax . Wings are large, with prominent anterior veins. Males have holoptic eyes, and ocelli are present. The larvae live in soil, roots, or decaying vegetation. The larvae of some species are among the most primitive...
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eye
Book article from: A Dictionary of Zoology
...An organ, sensitive to light, that is developed in many animals. In its simplest form, it consists of a light receptor (ocellus) capable of distinguishing light from shade. In Arthropoda there are compound eyes, each consisting of many separate receptors...
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Simuliidae
Book article from: A Dictionary of Zoology
...elongated mouthparts. The wings are broad, with thickened anterior veins. The antennae are short, and 11-segmented, and ocelli are absent. In males, the eyes are holoptic . Females of some species are active blood-suckers, especially Simulium damnosum...
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Sialidae
Book article from: A Dictionary of Zoology
...Pterygota , order Megaloptera ) Family of insects which are similar to the Corydalidae , but are usually much smaller and lack ocelli . They are blackish-grey, resemble lacewings, and are found near ponds or streams, where their larvae develop. The larvae...
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Phthiraptera
Book article from: A Dictionary of Zoology
...which are closely related to Psocoptera, Hemiptera , and Thysanoptera . Lice may be distinguished by the lack of wings and ocelli ; the reduction of the antennae to three flagellomeres, scape , and pedicel ; the loss of the metathoracic spiracles ; and...
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Zoraptera
Book article from: A Dictionary of Zoology
...debris, and feed on fungal spores and small arthropods, probably dead ones. Adults may be winged and pigmented, with eyes and ocelli ; or non-pigmented, wingless, and blind. There is one genus, with 22 described species, occurring in the Ethiopian...
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