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 tuskera Oláh & Flint 2012 Figs. 10 , 16 Acostatrichia tuskera Oláh & Flint 2012: 157 , figs. 38–40, male; type locality: Brazil : São Paulo State , Piracicaba; type depository: NMNH (not found). Redescription. Length from front of head to tips of folded forewings 3 mm (n = 3). General color, in alcohol, dark brown. Head unmodified. Ocelli 3. Antennae each 20-articulated; scape cylindrical, as long as wide, inner margin not produced; pedicel cylindrical; flagellomeres cylindrical, unmodified. Forewings each with costal vein bearing short basal bulla. Abdominal segment VII bearing very long ventromesal process, with capitate apex ( Figs. 10A, 10C ). Segment VIII shorter dorsally than ventrally ( Fig. 10C ); in ventral view, posterior margin of sternum truncate ( Fig. 10A ); with pair of ventrolateral processes with acute apices ( Figs. 10A, 10C ); tergum with transverse row of long setae ( Fig. 10B ). Segment IX mostly within segment VIII, ventrally open; without dorsolateral processes ( Figs. 10B, 10C ). Preanal processes globose and bearing very long setae ( Figs. 10B, 10C ). Inferior appendages fused with each other as plate with shallow U-shaped incision on posterior margin in ventral view ( Fig. 10A ); each with very long digitate lateral process rising from apex and bearing 3–4 subapical spine-like projections at midlength ( Fig. 10A ); in lateral view, upturned ( Fig. 10C ). Subgenital plate, in ventral view, broad, rounded and with small median triangular projection at apex ( Fig. 10A ); in lateral view, slightly downturned ( Fig. 10C ). Tergum X membranous, bilobed, both lobes rounded in dorsal view ( Fig. 10B ). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop shorter than basal portion of phallus ( Fig. 10D ); apical portion without conspicuous sclerites and with several internal spines ( Figs. 10D, 10E ). FIGURE 10. Acostatrichia tuskera Oláh & Flint 2012 , paratype male, genitalia. 10A , ventral; 10B , dorsal; 10C , left lateral; 10D , phallus, dorsal; 10E , phallus, left lateral. Scale bar = 0.1 mm. Material examined. PARATYPES : Brazil , Sao Paulo , Piracicaba , 12.III.1965 , C.A. Triplehorn leg., 3 males ( NMNH ). Remarks. As mentioned before, within the A . brevipenis Group, Acostatrichia brevipenis and A . tuskera appear to be closely related to each other, sharing similarities in the general aspect of male genitalia. Both species have the ventrolateral processes of segment VIII short and acute ( Figs. 7C , 10C ), whereas for the other species in the group those processes are much longer and not acute. Acostatrichia tuskera can be distinguished from A . brevipenis and other Acostatrichia species by the long apicolateral processes of the inferior appendages, which are curved inwards, in ventral view ( Fig. 10A ), and have 3 or 4 spines at midlength ( Figs. 10A, 10C ). Distribution. Brazil ( Fig. 16 ).