Ocellus - ορισμός. Τι είναι το Ocellus
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Τι (ποιος) είναι Ocellus - ορισμός

SIMPLE EYE WITHOUT RETINA
Ocelli; Stemmata; Invertebrate photoreceptor; Invertebrate photo receptor; Ocellus; Stemmas; Simple eyes in arthropods; Simple eyes in invertebrates; Pigment pit; Pigment Pits; Pigment pits; Ocellate; Simple eyes; Ocellation
  • Acherontia]]'' species shown here, is typical of the order Lepidoptera. The head of the larva bears more than one pair of stemmata, all of which are set low down and are far more widely placed than the mouthparts.
  • Head of ''[[Polistes]]'' with two compound eyes and three ocelli
  • An example of a sawfly larva. It has just a single pair of stemmata, and they are set higher on its head than the position of stemmata on the heads of [[Lepidoptera]]n larvae.
  • A [[Scolopendra]] species ([[Chilopoda]]) with stemmata incompletely aggregated into compound eyes
  • Moth larva about to moult; the new stemmata are visible behind the old head capsule
  • dorsal]] part of [[compound eyes]] (left and right)

ocellus         
[?'s?l?s]
¦ noun (plural ocelli -l??, -li:) Zoology
1. another term for simple eye.
2. another term for eyespot (in senses 1 and 2).
Derivatives
ocellar adjective
Origin
C19: from L., dimin. of oculus 'eye'.
Ocellus         
·noun An eyelike spot of color, as those on the tail of the peacock.
II. Ocellus ·noun A little eye; a minute simple eye found in many invertebrates.
Ocellus (disambiguation)         
WIKIMEDIA DISAMBIGUATION PAGE
An ocellus is a simple eye found in invertebrates, in which pigment is distributed randomly and for which there are no additional structures. It is not to be confused with the ocelloid, a light-sensitive structure found in some dinoflagellates.

Βικιπαίδεια

Simple eye in invertebrates

A simple eye (sometimes called a pigment pit) refers to a form of eye or an optical arrangement composed of a single lens and without an elaborate retina such as occurs in most vertebrates. In this sense "simple eye" is distinct from a multi-lensed "compound eye", and is not necessarily at all simple in the usual sense of the word.

The structure of an animal's eye is determined by the environment in which it lives, and the behavioural tasks it must fulfill to survive. Arthropods differ widely in the habitats in which they live, as well as their visual requirements for finding food or conspecifics, and avoiding predators. Consequently, an enormous variety of eye types are found in arthropods. They possess a wide variety of novel solutions to overcome visual problems or limitations.

Use of the term simple eye is flexible, and must be interpreted in proper context; for example, the eyes of humans and of other large animals such as most cephalopods, are camera eyes and in some usages are classed as "simple" because a single lens collects and focuses light onto the retina (analogous to film). By other criteria, the presence of a complex retina distinguishes the vertebrate camera eye from the simple stemma or ommatidium. Additionally not all ocelli (ocellus in singular) and ommatidia of invertebrates have simple photoreceptors; many, including the ommatidia of most insects and the central eyes of Solifugae have various forms of retinula, and the Salticidae and some other predatory spiders with seemingly simple eyes, emulate retinal vision in various ways. Many insects have unambiguously compound eyes consisting of multiple lenses (up to tens of thousands), but achieve an effect similar to that of a camera eye, in that each ommatidium lens focuses light onto a number of neighbouring retinulae.