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The term "ocellus" (plural ocelli) is derived from the Latin oculus (eye), and literally means "little eye". In insects, two distinct ocellus types exist: [9] dorsal (top-most) ocelli, and lateral ocelli (often referred to as ocelli and stemmata, respectively), most insects have dorsal ocelli while stemmata are found in the larvae of some ...
They may use their ocelli to supplement their night vision as well. Crepuscular bees have larger ocelli than diurnal bees, and nocturnal bees have the largest ocelli of all. [12] Ocelli are not used for precise visual information, but can be used for other uses of visual information. Megalopta ocelli are highly
[11] [21] The ocelli are not homologous to the simple eyes of caterpillars which are differently named as stemmata. [5] The ocelli of Lepidoptera are reduced externally in some families; where present, they are unfocussed, unlike stemmata of larvae which are fully focussed. The utility of ocelli is not understood at present. [5]
The underside is unmistakable, the ocelli being reduced to a very few so, that the white forewing is usually without markings from the base to the reddish yellow submarginal spots. Central and South Europe as far as Asia Minor, according to Sloper also obtained in England (at Dover). ab. obsoleta Gillm.
Ocelli obsolescent, but when present as mere minute dots their arrangement on the hind wing is as in the wet-season form. Antennae, head, thorax and abdomen brown; antennae sometimes cinereous white on the sides with the apex black. Male sex-marks in form 2, but that on the underside of the fore wing small (about 2 into, long) and black. [3]
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The insect order Zoraptera, commonly known as angel insects, contains small and soft bodied insects with two forms: winged with wings sheddable as in termites, dark and with eyes (compound) and ocelli (simple); or wingless, pale and without eyes or ocelli. They have a characteristic nine-segmented beaded (moniliform) antenna.
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