Acostatrichia cerna 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 : 219-221

Acostatrichia cerna Oláh & Flint 2012

Figs. 11 , 16

Acostatrichia cerna Oláh & Flint 2012: 143 , figs. 5–7, male; type locality: Ecuador: Los Rios Province. Quevedo (56 km North), Rio Palenque Biological Station, 250 m; type depository: NMNH.

Redescription. Length from front of head to tips of folded forewings 4 mm (n = 2). Specimens examined completely cleared. General color, in alcohol, according to Oláh & Flint (2012), brown. Head unmodified. Ocelli 3. Antenna broken; scape cylindrical, twice as long as wide, inner margin not produced; pedicel cylindrical. Forewings each with costal vein simple, unmodified. Abdominal segment VII bearing long ventromesal process, with acute apex ( Figs. 11A, 11C ). Segment VIII shorter dorsally than ventrally ( Fig. 11C ); in ventral view, posterior margin of sternum with two lobes forming median deep U-shaped incision surrounded by short setae ( Fig. 11A ); without lateral processes, but with apicoventral margins projecting in lateral view ( Fig. 11C ); tergum with short stout setae ( Fig. 11B ). Segment IX mostly within segment VIII, ventrally open; with pair of long digitiform dorsolateral processes with slightly dilated apices, almost straight in ventral and dorsal views ( Figs. 11A, 11B ), slightly upturned in lateral view ( Fig. 11C ); each with four long, strong, and curved apical spines ( Figs. 11 A–11C). Preanal process absent ( Fig. 11B ). Inferior appendages fused with each other only basally, distal portions free, each short, apically rounded and with incision on inner margin ( Fig. 11A ); with pair of very long rod-like lateral processes rising from basal area, in ventral view slightly dilated at apex ( Fig. 11A ); in lateral view, sinuous and slightly upturned ( Fig. 11C ). Subgenital plate, in ventral view, broad, with a sclerotized belt basally and concave at apex ( Fig. 11A ); in lateral view, directed posterad and rounded apically ( Fig. 11C ). Tergum X membranous, pentagonal in dorsal view ( Fig. 11B ). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop as long as basal portion ( Fig. 11D ); apical portion with conspicuous sclerite trifid at apex and two pairs of long straight internal spines ( Figs. 11D, 11E ).

Material examined. HOLOTYPE male: Ecuador, Los Rios Prov., Quevedo (56 km N), Rio Palenque Biological Station , 250 m, blacklight at riverbed, 28–29July1976, Jeffrey Cohen leg. ( NMNH); PARATYPE: Ecuador, Cotop. Quevedo (36 km NE), 21.VII.1976, blacklight, Jeffrey Cohen leg., 1 male ( NMNH).

Remarks. Within this species group, Acostatrichia cerna Oláh & Flint 2012 is more similar to A. ujasa , both species having four conspicuous apical spines on each of the dorsolateral processes of segment IX ( Figs. 11A , 14A ), whereas A. darda and A. kihara Oláh & Flint 2012 have only one apical spine on each of these processes ( Figs. 12A , 13A ). Acostatrichia cerna can be distinguished from A. ujasa by the smaller spines on each dorsolateral process of segment IX and by the number and size of internal spines in the phallus: four long spines in A. cerna and several smaller spines in A. ujasa .

Distribution. Ecuador ( 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 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 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 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.