A review of the Neotropical microcaddisfly genus Acostatrichia Mosely, 1939 with description of a new species from Brazil (Trichoptera: Hydroptilidae: Leucotrichiinae) Author Santos, Allan Paulo Moreira text Zootaxa 2020 2020-03-24 4755 2 201 230 journal article 10.11646/zootaxa.4755.2.1 dc3a4f00-2ae5-4844-a803-7d8dabd65435 1175-5334 3731414 urn:lsid:zoobank.org:pub:CAD4295B-2456-48EE-98F6-723FDEF5C0EB Acostatrichia brevipenis Group Remarks. In the descriptions of A . brevipenis Flint 1974 and A . fimbriata Flint 1974 , Flint (1974) indicated that these two species constituted a particular group within the genus, differing in several aspects from the other species known until that time. Here, together with another 3 species ( A . buborektala Oláh & Johanson 2011 , A . digitata Thomson & Holzenthal 2012 , A . tuskera Oláh & Flint 2012 ), they are placed into the A . brevipenis Group. This group is characterized by having the following features: (1) a costal bulla is usually absent from each forewing (present in A . brevipenis and A . tuskera ); (2) abdominal segment VII has one long and somewhat capitate ventromesal process, usually with a rugose apex; (3) segment VIII has a pair of conspicuous ventrolateral processes; (4) the inferior appendages are fused to each other, usually with a pair of digitate apicolateral processes. In the phylogenetic analysis presented by Santos et al . (2016) , species in the A . brevipenis Group did not cluster with those of the A . plaumanni Group. However, the placement of the A . brevipenis Group remained unclear, since the analyses had no resolution at this point ( Santos et al . 2016 ). It is likely that the A . brevipenis Group will become a new genus or that its species will be transferred, but with the currently limited knowledge of Leucotrichiinae diversity and phylogeny, I prefer to clarify the morphological and taxonomic aspects before proposing a new genus name.