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

Acostatrichia brevipenis Flint 1974

Figs. 7 , 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 ). 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. 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).

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 ), 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 ). 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 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 ).

Figures

FIGURE 7. Acostatrichia brevipenis Flint 1974, non-type male from Roraima, Brazil, genitalia. 7A, ventral; 7B, dorsal; 7C, left lateral; 7D, phallus, dorsal; 7E, phallus, left lateral.Abbreviations: vl. proc. = ventrolateral process of segment VIII (paired); sb. pl. = subgenital plate; inf. app. = inferior appendage (fused); apl. proc. = apicolateral process of inferior appendage (paired); pre. proc. = preanal process (paired). Scale bar = 0.1 mm.

FIGURE 16. Distribution map of the Acostatrichia species in South America, based on material examined here and previously published records. When latitude and longitude were not available, an approximate location was used. Circle, species in the Acostatrichia plaumanni Group; square, species in the Acostatrichia brevipenis Group; triangle, species in the Acostatrichia cerna Group.