Acostatrichia ujasa 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 : 225

Acostatrichia ujasa Oláh & Flint 2012

Figs. 14 , 15C , 16

Acostatrichia ujasa Oláh & Flint 2012: 158 , figs. 41–43, male; type locality: Ecuador: Pastaza Province, Puyo (27 km North), Estacion Fluviometrica; type depository: NMNH.

Leucotrichiinae genus B Santos et al. 2016: 462, figs. 4, 5; phylogenetic placement.

Redescription. Length from front of head to tips of folded forewings 4.0– 4.5 mm (n = 6). General color, in alcohol, brown. Pinned specimen brown, with spots of green setae on head, thorax, and wings ( Fig. 15C ). Head unmodified. Ocelli 3. Antennae each 21-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. 14A, 14C ). Segment VIII shorter dorsally than ventrally ( Fig. 14C ); in ventral view, posterior margin of sternum with two lobes forming deep median U-shaped incision surrounded by short setae ( Fig. 14A ); without lateral processes, but with apicoventral margin projecting in lateral view ( Fig. 14C ); tergum with transverse row of long setae ( Fig. 14B ). Segment IX mostly within segment VIII, ventrally open, with pair of long digitiform dorsolateral processes with slightly dilated apices, slightly curved gradually laterad except apices curved slightly inwards in ventral and dorsal views ( Figs. 14A, 14B ), slightly upturned in lateral view ( Fig. 14C ); each with four very long, strong, and curved apical spines ( Figs. 14 A–14C). Preanal process absent ( Fig. 14B ). Inferior appendages fused with each other only basally, distal portions free, each short, apically rounded and with subapical incision on inner margin ( Fig. 14A ); with pair of very long rod-like lateral processes rising from basal area, dilatated at apices ( Fig. 14A ); in lateral view, upturned ( Fig. 14C ). Subgenital plate, in ventral view, broad, with sclerotized belt basally and with V-shaped incision on posterior margin ( Fig. 14A ); in lateral view, directed posterad and rounded apically ( Fig. 14C ). Tergum X membranous, bilobed, dorsal lobe quadrangular, ventral lobe pentagonal in dorsal view ( Fig. 14B ). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop as long as basal portion ( Fig. 14D ); apical portion with plate-like sclerite and more than eight internal spines ( Figs. 14D, 14E ).

Material examined. HOLOTYPE male: Ecuador, Past., Puyo (27 Kms. N.) Est. Fluv. Metrica, 4 February 1976, Spangler et al. leg. ( NMNH); PARATYPE: same data, 1 male pinned ( NMNH).

Additional material. Peru, Cusco, Quincemil, stream, S 13°13’03” W 73°43’40”, el. 633 m, 20.viii.2012, light trap, APM Santos & DM Takiya leg., 3 males ( DZRJ).

Remarks. This species shares with A. cerna similarities in the general aspect of the male genitalia, particularly, the presence of three or four conspicuous apical spines on each dorsolateral process of segment IX ( Figs. 11A , 14A ). However, these two species can be distinguished from each other by those apical spines, much longer in A. ujasa , and also by phallus, in A. ujasa with more than eight internal spines ( Fig. 14D ), whereas in A. cerna the phallus has four long internal spines ( Fig. 11D ).

Distribution. Ecuador and Peru ( Fig. 16 ).

Figures

FIGURE 11. Acostatrichia cerna Oláh & Flint 2012, paratype male, genitalia. 11A, ventral; 11B, dorsal; 11C, left lateral; 11D, phallus, dorsal; 11E, phallus, left lateral. Abbreviations: sb. pl. = subgenital plate; inf. app. = inferior appendage (paired); dl. proc. = dorsolateral process of segment IX (paired); lat. proc. = lateral process of inferior appendage (paired). Scale bar = 0.1 mm.

FIGURE 14. Acostatrichia ujasa Oláh & Flint 2012, paratype male, genitalia. 14A, ventral; 14B, dorsal; 14C, left lateral; 14D, phallus, dorsal; 14E, 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.