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Encyclopedia > Ocelli

Ocelli is one of the types of photoreceptor organs in animals. Also called 'simple eyes'. Ocelli are miniature eyes capable just of sensing light but not of distinguishing its direction. Photoreceptors are light-sensitive proteins involved in the function of photoreceptor cells. ... This article refers to the sight organ. ...


Ocelli are found in many invertebrates. Other photoreceptor organs include image forming eyes like in higher animals and photo-sensing cells. Invertebrate is a term coined by Chevalier de Lamarck to describe any animal without a backbone or vertebra, like insects, squids and worms. ...


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Rosenzweig CHAPTER 5 (9655 words)
Each of these ocelli is situated on a separate plane, with the 3 planes forming a 90 0 angle with one another and thus panoramically encircling the dome at the tip of the vertex.
The domeshaped corneas of the ocelli protrude outwards at an orientation of 90 0 to one another, with the distance between the two lateral ocelli being 330 µm while that between them and the median ocellus is 250 µm (Plate I, Figure B).
The lens of the ocelli is homologous to the comus of the ommatidium.
Psyche 55:113-130 (2401 words)
The species of Perlesta are of moderate size ; they have three ocelli; the antennae have basal joints as long as broad, with many fine appressed hairs, each joint with one or more longer erect hairs (sense hairs).
It is yellowish to rufous, the ocelli faintly connected by a dark V-mark; legs are pale below with a brown streak above, the hind tibiae dark except near tip; hind femur fairly slender ; sides of ocellar triangle longer than base.
Brown marked with pale yellowish, ocelli joined by fairly broad, almost fl lines, a pale yellowish triangle within, laterally, each side of the front ocellus the dark is extended nearly to the margin of head.
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