Acostatrichia brevipenis Flint 1974

Santos, Allan Paulo Moreira, 2020, A review of the Neotropical microcaddisfly genus Acostatrichia Mosely, 1939 with description of a new species from Brazil (Trichoptera: Hydroptilidae: Leucotrichiinae), Zootaxa 4755 (2), pp. 201-230 : 213

publication ID 10.11646/zootaxa.4755.2.1

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Acostatrichia brevipenis Flint 1974


Acostatrichia brevipenis Flint 1974

Figs. 7 View FIGURE 7 , 16 View FIGURE 16

Acostatrichia brevipenis Flint 1974: 54 , figs. 105–107, male; type locality: Surinam, Lawa River, Anapaike; type depository: 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 View FIGURE 7 ). Segment VIII shorter dorsally than ventrally; in ventral view, posterior margin of sternum slightly emarginated ( Fig. 7A View FIGURE 7 ); with pair of acute ventrolateral processes ( Fig. 7C View FIGURE 7 ); tergum with row of long setae ( Fig. 7B View FIGURE 7 ). Segment IX mostly within segment VIII, ventrally open; without dorsolateral processes ( Fig. 7C View FIGURE 7 ). Preanal process globose and bearing very long setae ( Fig. 7B View FIGURE 7 ). Inferior appendages fused with each other as plate, with shallow Ushaped incision on posterior margin in ventral view ( Fig. 7A View FIGURE 7 ); with pair of very long digitate lateral processes rising from apex ( Fig. 7A View FIGURE 7 ), upturned in lateral view ( Fig. 7C View FIGURE 7 ). Subgenital plate, in ventral view, broad, with V-shaped incision on posterior margin ( Fig. 7A View FIGURE 7 ); in lateral view, downturned ( Fig. 7C View FIGURE 7 ). Tergum X membranous, bilobed, dorsal lobe triangular, ventral lobe trapezoidal in dorsal view ( Figs. 7B, 7C View FIGURE 7 ). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop as long as basal portion ( Fig. 7D View FIGURE 7 ); apical portion with slightly sclerotized sclerite and several very short internal spines ( Figs. 7D, 7E View FIGURE 7 ).

Material examined. PARATYPES: Surinam, Lawa R., Anapaike , 14 Nov.1963, S. Ligorie at light, 2 males ( NMNH).

Additional material. Brazil, Bahia, Rio São Francisco, Sobradinho , 16.ii.1989, E Rosa & W Terra leg., 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 Santos leg., light trap, APM Santos det., 1 male ( DZRJ). GoogleMaps

Remarks. Acostatrichia brevipenis Flint 1974 was described from Suriname and then recorded from northern Brazil ( Flint 1992) and from French Guiana ( Oláh & Johanson 2011). Acostatrichia brevipenis shares with A. tuskera a short and acute ventromesal process on segment VIII ( Fig. 7B View FIGURE 7 ), which is long and not acute in the other 3 species in the A. brevipenis Group. 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 View FIGURE 7 ). 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 View FIGURE 7 ). This also helps to differentiate this species from the others in the group, since these spines are absent ( A. buborektala Oláh & Johanson 2011 and A. digitata Thomson & Holzenthal 2012 ) or longer ( A. fimbriata Flint 1974 and A. tuskera Oláh & Flint 2012 ) in all other species.

Distribution. Brazil, French Guiana, Suriname ( Fig. 16 View FIGURE 16 ).


USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]




Departamento de Geologia, Universidad de Chile


Smithsonian Institution, National Museum of Natural History


Dominion Museum














Acostatrichia brevipenis Flint 1974

Santos, Allan Paulo Moreira 2020

Acostatrichia brevipenis

Olah, J. & Johanson, K. A. 2011: 213
Flint, O. S. Jr. 1992: 213
Flint, O. S. Jr. 1974: 54