Antocha (Orimargula)


Mik, J. 1883. Zur Kenntnis der Limnobia anomala O. S.. Wiener Entomologische Zeitung 2: 198.


An extensive genus of commonly encountered aquatic flies that are grouped based on characteristics of wing venation and by the reduction of the larval respiratory system to an apneustic state. The adult Antocha are characterized by the prominent anal lobe of the wing and the strong Costal and Radial veins that result in the compression of the cells of the radial field. Antocha (Antocha) can be separated from A. (Orimargula) by the possession on cell dm, which is lost in A. (Orimargula). The male genitalia of this genus is simple with two gonostyli, a more sclerotized dorsal style and a simple fleshy ventral style.

Antocha (Orimargula) brevifrurca wing

Figure 1. Wing of Antocha (Orimargula) brevifurca Alexander (scale bar = 1.0 mm)

Antocha (Orimargula) brevifrurca hypopygium
Figure 2. Male hypopygium of Antocha (Orimargula) brevifurca Alexander (re-drawn from Alexander 1970)

Antocha (Orimargula) contains 41 presently described species and is strongly distributed in both the Afrotropical (21 species) and Oriental (15 species) Regions. The genus is widely distributed throughout the Oriental Region and should be commonly encountered around cool streams and rivers. Antocha (Orimargula) is additionally known from the Western Palearctic (1 species), Eastern Palearctic (2 species), and Australian/Oceanic (3 species) Regions.

Larval Habitat: 

The larvae of A. (Orimargula) are apneustic and completely aquatic in larval and pupal stages. They typically inhabit cool streams inside silken tubes that are found in cracks and crevices of rocks.