Abstract
A revision of the microcaddisfly genus Ascotrichia (Trichoptera, Hydroptilidae) is provided, including a generic diagnosis, illustrations, and descriptions of males. This genus is endemic to the Neotropical region and has been recorded from countries in northern South America. Adults of the genus are notable within the family for the contrasting black and green hairs on the forewings. A total of six species are treated, three described as new: Ascotrichia adirecta sp. n. (Brazil), A. hystricosa sp. n. (Brazil), and A. simoma sp. n. (Brazil).
Highlights
The genus Ascotrichia Flint, 1983 belongs to the family Hydroptilidae, the micro or casemaking caddisflies
The genus was originally established for two species: Ascotrichia frontalis Flint, 1983, the type species, and A. surinamensis (Flint), 1974, transferred from the genus Betrichia Mosely, 1939
The description of the male genitalia referred to posteromesal points on sterna VI and VII, a broad sternum VIII with a posterolateral process, and a phallus with a midlength complex
Summary
The genus Ascotrichia Flint, 1983 belongs to the family Hydroptilidae, the micro or casemaking caddisflies. Ascotrichia spangleri Oláh and Flint was described in 2012, bringing the total number of species contained within the genus to three (Holzenthal & Calor, 2017). More detailed features of the male genitalia and a forewing length of 4.5–5 mm were given in the species description of A. frontalis. Illustrations of the male genitalia were included in the description of the type species The Leucotrichia genus cluster can be distinguished from the Celaenotrichia genus cluster by a modified spur formula and the typical leucotrichiine phallic median complex originally described in 1970 by Flint (Oláh & Johanson, 2011). Ascotrichia grouped with other genera from the Leucotrichia genus cluster (Oláh & Johanson, 2011) and was placed in the tribe Leucotrichiini Flint, 1970 sensu n., as modified by Santos, Nessimian & Takiya (2016). All three previously known Ascotrichia species are re-described and illustrated, along with three new species, bringing the total number of species to six
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