Acostatrichia brevipenis Flint 1974: 54 Flint (1992) Oláh & Johanson (2011) A review of the Neotropical microcaddisfly genus Acostatrichia Mosely, 1939 with description of a new species from Brazil (Trichoptera: Hydroptilidae: Leucotrichiinae) Santos, Allan Paulo Moreira Zootaxa 2020 2020-03-24 4755 2 201 230 9HXJ Flint 1974 Flint 1974 [151,578,153,180] Insecta Hydroptilidae Acostatrichia Animalia Trichoptera 12 213 Arthropoda species brevipenis   Figs. 7, 16      Acostatrichia brevipenis Flint 1974: 54, figs. 105–107, male; typelocality: Surinam, Lawa River, Anapaike; typedepository: RNH.   Flint (1992), reported from Brazil.   Oláh & Johanson (2011), reported from French Guiana.   Redescription.Length from front of head to tips of folded forewings 2.0– 2.5 mm(n = 3). General color, in alcohol, brown. Head unmodified. Ocelli 3. Antenna 20-articulated; scape cylindrical, twice 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 fimbriate and capitate apex ( Figs. 7A, 7C). Segment VIII shorter dorsally than ventrally; in ventral view, posterior margin of sternum slightly emarginated ( Fig. 7A); with pair of acute ventrolateral processes ( Fig. 7C); tergum with row of long setae ( Fig. 7B). Segment IX mostly within segment VIII, ventrally open; without dorsolateral processes ( Fig. 7C). Preanal process globose and bearing very long setae ( Fig. 7B). Inferior appendages fused with each other as plate, with shallow Ushaped incision on posterior margin in ventral view ( Fig. 7A); with pair of very long digitate lateral processes rising from apex ( Fig. 7A), upturned in lateral view ( Fig. 7C). Subgenital plate, in ventral view, broad, with V-shaped incision on posterior margin ( Fig. 7A); in lateral view, downturned ( Fig. 7C). Tergum X membranous, bilobed, dorsal lobe triangular, ventral lobe trapezoidal in dorsal view ( Figs. 7B, 7C). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop as long as basal portion ( Fig. 7D); apical portion with slightly sclerotized sclerite and several very short internal spines ( Figs. 7D, 7E).   Material examined.   PARATYPES: Surinam, Lawa R., Anapaike,  14 Nov.1963, S. Ligorieat light, 2 males( NMNH).   Additional material. Brazil, Bahia, Rio São Francisco, Sobradinho,  16.ii.1989, E Rosa& W Terraleg., Flint, 1990 det., 1 male( NMNH).  Roraima: Amajari, Est. Ecológica de Maracá, Alojamento, N 03°21’44” W 61°26’03”, el.  103 m,  24.iii.2016, DM Takiya& APM Santosleg., light trap, APM Santosdet., 1 male( DZRJ).   Remarks.  Acostatrichia brevipenis Flint 1974was described from Surinameand then recorded from northern Brazil( Flint 1992) and from French Guiana( Oláh & Johanson 2011).  Acostatrichia brevipenisshares with  A. tuskeraa short and acute ventromesal process on segment VIII ( Fig. 7B), which is long and not acute in the other 3 species in the  A. brevipenisGroup. This species can be also distinguished from the others by the apicolateral processes of the inferior appendages, which are very long, digitate, without spines or other processes, and directed upwards in lateral view ( Fig. 7C). Flint (1974)mentioned 2 internal spines in the posterior portion of the phallus, but it seems to be several very short spines ( Figs. 7D, 7E). This also helps to differentiate this species from the others in the group, since these spines are absent (  A. buborektala Oláh & Johanson 2011and  A. digitata Thomson & Holzenthal 2012) or longer (  A. fimbriata Flint 1974and  A. tuskera Oláh & Flint 2012) in all other species.   Distribution. Brazil, French Guiana, Suriname( Fig. 16). 2592189806 1963-11-14 R, NMNH S. Ligorie Suriname Anapaike Lawa 12 213 2 2 paratype 2592189826 1989-02-16 NMNH Brazil Sobradinho Rio Sao Francisco 12 213 1 1 Bahia 2592189809 2016-03-24 DM, DZRJ 103 3.3622222 Est. Ecologica de Maraca 21 -61.434166 Amajari 12 213 1 1 Roraima