Therevidae
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The Therevidae are a family of flies of the superfamily Asiloidea commonly known as stiletto flies. The family contains about 1,600 described species worldwide, most diverse in arid and semiarid regio
Thereva.nobilitata 2..lindsey
Plate from Johann Wilhelm Meigen EuropäischenZweiflügeligen.Showing the gross features mentioned in the text (figures 5-9)
Mating (species from Queensland, Australia)
Arthropod eye
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Apposition eyes are the most common form of eye, and are presumably the ancestral form of compound eye. They are found in all arthropod groups, although they may have evolved more than once within thi
Therevidae
…black, but commonly the background colour is masked by the tomentum. The compound eyes are generally larger in males, which in many species are actually holoptic. Females have well-developed compound eyes, but are clearly dichoptic. There are three ocelli. The antennae are relatively short. The scape is elongated…
Insects and all mandibulates have compound eyes, with the exception of some myriapods that have stemmata.
The male Tabanus lineola has holoptic compound eyes, with the dorsal ommatidia larger than the ventral ommatidia.
In some male mayflies the eyes are split into separate organs for distinct visual functions.
Stalked dichoptic eyes of a River Crab are typical of mature larger Crustacea. The reflection of the photographer in different regions of the surface of each eye indicate the basis for stereoscopic vision.