Acostatrichia tuskera Oláh & Flint 2012

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 : 217-219

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 ).

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 ).

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 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.

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.