Allotrichoma (Neotrichoma), Mathis, Wayne N. & Zatwarnicki, Tadeusz, 2012

Mathis, Wayne N. & Zatwarnicki, Tadeusz, 2012, Revision of New World Species of the Shore-fly Subgenus Allotrichoma Becker of the Genus Allotrichoma with Description of the Subgenus Neotrichoma (Diptera, Ephydridae, Hecamedini), ZooKeys 161, pp. 1-101 : 65

Neotrichoma subgen. n.

Type species.

Allotrichoma atrilabre Cresson, by present designation.

Diagnosis.

Minute to small to moderately small shore flies, body length 0.85-1.45 mm.

Head: Frons mostly unicolorous, at most with narrow, anterior fronto-orbits slightly lighter in color, lacking distinctively colored ocellar triangle; pseudopostocellar setae subequal in length to ocellar setae. Pedicel with well-developed, proclinate, dorsal seta. Facial coloration sexually dimorphic, males unicolorous and darker; face with dorsal 2/3 between antennal grooves shallowly carinate, becoming more prominent ventrad of facial grooves, slightly tuberculate; clypeus mostly bare, black, subshiny; palpus blackish.

Thorax: Mesonotum generally dark brown; chaetotaxy generally well developed; prescutellar acrostichal setae much larger than other acrostichal setae and more widely set apart; presutural supra-alar seta well developed, length subequal to notopleural setae; katepisternum with 2 setae, 2nd seta smaller and inserted below larger seta. Wing mostly milky white; veins behind costa brownish; alular marginal setulae short, less than 1/2 alular height. Legs: tibiae dark, concolorous with femora.

Abdomen: 5th tergite of male short, about 1/2 length of 4th tergite; 5th sternite unmodified. Male terminalia: cerci normally developed, not extended ventrally beyond ventral margin of epandrium; aedeagus and phallapodeme attached.

Discussion.

Neotrichoma is more closely related to the subgenus Pseudohecamede than to Allotrichoma sensu stricto. The structures of the male terminalia are especially diagnostic in this regard (unmodified 5th sternite, shorter 5th tergite, unmodified cerci).

Key to Males of the Subgenus Neotrichoma