Acostatrichia kihara 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 : 223-225

Acostatrichia kihara Oláh & Flint 2012

Figs. 13 , 15B , 16

Acostatrichia kihara Oláh & Flint 2012: 150 , figs. 22–25, male; type locality: Ecuador: Napo Province, Pano, at stream, 580 m; type depository: NMNH.

Redescription. Length 3.3–3.5 mm (n = 2). General color, in alcohol, brown. Pinned specimen brown, with spots of green setae on head, thorax, and wings ( Fig. 15B ). Head unmodified. Ocelli 3. Antennae each 20-articulated; scape cylindrical, twice as long as wide, inner margin not produced; pedicel cylindrical; flagellomeres cylindrical, unmodified. Forewings each with costal vein simple, unmodified. Abdominal segment VII bearing long ventromesal process, with acute apex ( Figs. 13A, 13C ). Segment VIII shorter dorsally than ventrally ( Fig. 13C ); in ventral view, posterior margin of sternum with two lobes forming a median deep V-shaped incision surrounded by short setae ( Fig. 13A ); without lateral processes, but with apicoventral margin projecting in lateral view ( Fig. 13C ); tergum with scattered setae ( Fig. 13B ). Segment IX mostly within segment VIII, ventrally open, with pair of long digitiform dorsolateral processes, slightly curved inward in ventral and dorsal views ( Figs. 13A, 13B ), slightly upturned in lateral view ( Fig. 13C ); each with strong apical spine ( Fig. 13C ). Preanal process absent ( Fig. 13B ). Inferior appendages fused with each other only basally, each distal portion free, club-shaped, apically rounded with acute internal corner ( Fig. 13A ); with pair of very long rod-like lateral processes rising from basal area ( Fig. 13A ); in lateral view, straight and posteriorly directed ( Fig. 13C ). Subgenital plate, in ventral view, broad and concave at apex ( Fig. 13A ); in lateral view, directed posterad and rounded apically ( Fig. 13C ). Tergum X membranous, bilobed, dorsal lobe quadrangular, ventral lobe pentagonal in dorsal view ( Fig. 13B ). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop as long as basal portion ( Fig. 13D ); apical portion with conspicuous sclerite having U-shaped incision at apex, several short internal spines ( Figs. 13D, 13E ), and pair of long curved internal spines, forming forceps in dorsal view ( Fig. 13D ).

Material examined. HOLOTYPE male: Ecuador, Napo, Pano , 580 m, 12 Sep 1990, blacklight at stream, P.J. Spangler leg., colln#19 ( NMNH); PARATYPES: Venezuela, BA., Rio Sto. Domingo, Barinas, 17 February 1976, C.M. & O.S. Flint, Jr. leg., 1 male pinned, 1 male alcohol ( NMNH).

Remarks. As mentioned before, within the A. cerna Group, this and the preceding species share several features of male genitalia, for example, the presence of an apical spine on each dorsolateral process of segment IX ( Figs. 12A , 13A ), the general aspect of inferior appendages ( Figs. 12A , 13A ), and the phallus with a pair of long and curved internal spines ( Figs. 12D , 13D ). However, A. kihara can be recognized by the spines of the dorsolateral processes of segment IX being straight ( Fig. 13A ), not geniculate ( Fig. 12A ), by the lateral processes of the inferior appendages being more digitiform in ventral ( Fig. 13A ) and lateral views ( Fig. 13C ), and by the presence of several short spines in the phallus near the base of the internal sclerite ( Fig. 13D ).

Distribution. Ecuador and Venezuela ( Fig. 16 ).

Figures

FIGURE 12. Acostatrichia darda Oláh & Flint 2012, paratype male, genitalia. 12A, ventral; 12B, dorsal; 12C, left lateral; 12D, phallus, dorsal; 12E, phallus, left lateral. Scale bar = 0.1 mm.

FIGURE 13. Acostatrichia kihara Oláh & Flint 2012, paratype male, genitalia. 13A, ventral; 13B, dorsal; 13C, left lateral; 13D, phallus, dorsal; 13E, phallus, left lateral. Scale bar = 0.1 mm.

FIGURE 15. Acostatrichia spp., adult male habitus. 15A, Acostatrichia darda Oláh & Flint 2012 (paratype male of synonym A. pika Oláh & Flint 2012); 15B, Acostatrichia kihara Oláh & Flint 2012, paratype male; 15C, Acostatrichia ujasa Oláh & Flint 2012, paratype male. Scale bars = 0.5 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.