 Three wasp ocelli (centre) and dorsal part of compound eyes An ocellus (plural: ocelli) is a type of photoreceptor organ in animals. Also called "simple eyes", ocelli are miniature eyes capable of sensing light but not distinguishing its direction. See also stemmata, which are structurally similar. Ocelli are found in many invertebrates. Insects in particular have two types of ocelli, dorsal ocelli and lateral ocelli. Image File history File links Wasp_ocelli. ...
Image File history File links Wasp_ocelli. ...
Suborder Apocrita See text for explanation. ...
In anatomy, the dorsum is the upper or back side of an animal, as opposed to the ventrum. ...
A photoreceptor, or photoreceptor cell, is a specialized type of neuron found in the eyes retina that is capable of phototransduction. ...
This article refers to the sight organ. ...
Stemma (pl. ...
Invertebrate is a term that describes any animal without a spinal column. ...
{{Taxobox | color = pink | name = Insects | fossil_range = Carboniferous - Recent | image = European honey bee extracts nectar. ...
The term is also used for eyespots or eye-like markings on butterflies, reptiles and birds. In smaller members of the Felidae family (such as the Leopard Cat), ocelli are white circular markings on the backs of the ears. Subfamilies Felinae Pantherinae †Machairodontinae The Felidae family includes the Lion, the Tiger, the Domestic Cats, and other felines as its members. ...
Binomial name Felis bengalensis (Kerr, 1792) The Leopard Cat (Felis bengalensis) is a small wild cat of Southeast Asia. ...
Dorsal Ocelli Dorsal ocelli are light-sensitive organs on the dorsal surface or on the top of the head. There are generally three, forming a triangle.
They consist of a few dozen rod cells covered with a corneal lens. In some species, such as locusts, dorsal ocelli may contain several hundreds of retinula cells. Insects with dorsal ocelli also have compound eyes. Rod cells, or rods, are photoreceptor cells in the retina of the eye that can function in less intense light than can the other type of photoreceptor, cone cells. ...
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eyes optical power [1]. Together with the lens, the cornea refracts light and, as a result, helps the eye to focus. ...
Desert locust Nymph of Locust Schistocera americana with distinct wing-rudiments Desert Locust Schistocerca gregaria Locust from the 1915 Locust Plague For other uses, see Locust (disambiguation). ...
Compound eye of a dragonfly Compound eye of Antarctic krill as imaged by an electron microscope A compound eye is a visual organ found in certain arthropods such as insects and crustaceans. ...
Lateral Ocelli Lateral ocelli have a mixture of rod cells and cone cells and are found on the sides of the head, one to six on each side. Rod cells, or rods, are photoreceptor cells in the retina of the eye that can function in less intense light than can the other type of photoreceptor, cone cells. ...
Normalised absorption spectra of human cone (S,M,L) and rod (R) cells Cone cells, or cones, are cells in the retina of the eye which only function in relatively bright light. ...
Lateral ocelli are the only eyes of the larvae of several orders of insects (fleas, springtails, silverfish, and Strepsiptera). Families Tungidae – sticktight and chigoe fleas (chiggers) Pulicidae – common fleas Coptopsyllidae Vermipsyllidae – carnivore fleas Rhopalopsyllidae – marsupial fleas Hypsophthalmidae Stephanocircidae Pygiopsyllidae Hystrichopsyllidae – rat and mouse fleas Leptopsyllidae – mouse and rat fleas Ischnopsyllidae – bat fleas Ceratophyllidae:-fleas mainly associated with rodents Amphipsyllidae Malacopsyllidae Dolichopsyllidae – rodent fleas Ctenopsyllidae Flea is the common name...
Families [1] Suborder Arthropleona Superfamily Entomobryoidea Entomobryidae Isotomidae Oncopoduridae Paronellidae Tomoceridae Superfamily Poduroidea Brachystomellidae Hypogastruridae Neanuridae Odontellidae Onychiuridae Poduridae Suborder Symphypleona Dicyrtomidae Katiannidae Sminthuridae Sminthurididae Bourletiellidae Arrhopalitidae Springtails (Order Collembola) form the largest of the three orders of modern hexapods that are no longer considered to be insects (along with...
Binomial name Lepisma saccharina Linnaeus, 1758 For other uses, see Silverfish (disambiguation). ...
Families Mengenillidae Mengeidae Stylopidae Bohartillidae Corioxenidae Halictophagidae Callipharixenidae Elenchidae Myrmecolacidae Species in the nine families of this small (~600 species) order of insects are parasites in other insects; their hosts include bees, wasps, leafhoppers, silverfish, and cockroaches. ...
Function In insects, ocelli are involved (along with compound eyes) in the horizon-detecting response, decreasing the latency between horizon changes and the insect's response. {{Taxobox | color = pink | name = Insects | fossil_range = Carboniferous - Recent | image = European honey bee extracts nectar. ...
Compound eye of a dragonfly Compound eye of Antarctic krill as imaged by an electron microscope A compound eye is a visual organ found in certain arthropods such as insects and crustaceans. ...
{{Taxobox | color = pink | name = Insects | fossil_range = Carboniferous - Recent | image = European honey bee extracts nectar. ...
Eyespots The term ocellus is also applied to eye-like markings. In many species, such markings provide protection by appearing threatening or by diverting attention away from vital body parts (see automimicry). A mimic is any species that has evolved to appear similar to another successful species in order to dupe predators into avoiding the mimic, or dupe prey into approaching the mimic. ...
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