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Compound eye of Antarctic krill as imaged by an electron microscope. A compound eye is a visual organ found in arthropods such as insects and crustaceans.It may consist of thousands of ommatidia, [1] which are tiny independent photoreception units that consist of a cornea, lens, and photoreceptor cells which distinguish brightness and color.
The arthropods ancestrally possessed compound eyes, but the type and origin of this eye varies between groups, and some taxa have secondarily developed simple eyes. The organ's development through the lineage can be estimated by comparing groups that branched early, such as the velvet worm and horseshoe crab to the advanced eye condition found ...
The butterfly compound eye consists of multiple ommatidia, each of which consist of nine photoreceptor cells (numbered from R1–R9), and primary and secondary pigment cells. [5] Nymphalid butterflies have the simplest eye ommatidium structure, consisting of eight photoreceptor cells (R1–R8) and a tiny R9 cell organized into a different tier.
Lepidoptera has two large, immovable compound eyes, which consist of a large number of facets or lenses, each connected to a lens-like cylinder that is attached to a nerve leading to the brain. [11] Each eye may have up to 17,000 individual light receptors , which in combination provide a broad mosaic view of the surrounding area. [6]
The legs, including the claws, have bands of colour, in red, orange and white, and the claws bear short spines on the dorsal surface. [6] The eyestalks are short, but bear large black compound eyes. [6] P. armatus can be told apart from the similar P. ochotensis by the spines on its claws, which in P. ochotensis are replaced by granules. The ...
The Myodocopida are distinguished by a worm-like seventh limb, and, usually, a rostrum above an incisure (notch) from which the antennae can protrude. [3] Unlike other ostracods , many species of the Myodocopida have lateral compound eyes [ 4 ] Over the last thirty years there has been much research into the morphology, behaviour and ...
Myriapods have a single pair of antennae and, in most cases, simple eyes. Exceptions are the two classes of symphylans and pauropods, the millipede order Polydesmida and the centipede order Geophilomorpha, which are all eyeless. [10] The house centipedes on the other hand, have large and well-developed compound eyes. [11]
By Uwe Kils, used on Antarctic krill, Compound eye, Eye and others. - Mark 1 03:05, 15 Jun 2005 (UTC) Nominate and support. Mark 1 03:05, 15 Jun 2005 (UTC) neutral - looks really good if you click twice in the image Uwe Kils 03:30, Jun 15, 2005 (UTC) Strong Support. Dr. kils' pictures are, as always, a feast for the eye. El_C 12:03, 15 Jun 2005 ...
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