Betrichia nhundiaquara, De Souza, Wagner Rafael M., Santos, Allan Paulo Moreira & Takiya, Daniela Maeda, 2016

De Souza, Wagner Rafael M., Santos, Allan Paulo Moreira & Takiya, Daniela Maeda, 2016, Description of a new species of Betrichia Mosely 1939 from Brazil and redescription of the type-species (Trichoptera: Hydroptilidae: Leucotrichiinae), Zootaxa 4061 (3), pp. 291-295 : 291-293

Betrichia nhundiaquara sp. nov. ( Fig. 1A –E)

Description. Adult male. Holotype. Length (from tip of head to wing apices) 3.0 mm. General color brown (in alcohol).

Head with dorsal warts with posterior margins open. Antennae simple, with 19 antennomeres; scape slightly flattened,

other antennomeres cylindrical. Ocelli 2. Tibial spur formula 1-3-4. Venation of anterior wings distinct, veins reaching

wing margins. Posterior wing venation distinct; with long setae on anal margins. Mesoscutellum with transverse suture.

Metascutellum pentagonal. Abdomen without visible modifications. Segment VII with slender mesoventral process. Male genitalia. Segment VIII shorter dorsally than ventrally, with incomplete margin in lateral view; sternum with

posteroventral margin concave and lateral corners produced posteriorly into pair of slender processes; tergum

rectangular, short. Segment IX internalized in segment VIII, open ventrally, with dorsomedian depression bearing setae on its edges, posterolateral margins darkened in dorsal view. Inferior appendages completely fused to each other, elongate, covered by setae; in ventral view, digitiform; in lateral view, narrowing apically. Subgenital plate as long as the inferior appendages, wide ventrally; in lateral view directed posteroventrad. Tergum X membranous, short, and rounded in dorsal and lateral views. Phallus tubular basally, with median complex (window and dorsal process); dorsal process shorter than basal portion of phallus; in dorsal view, with pair of membranous lobes and small, apically rounded plate subapically and long spear-like sclerite apically; in lateral view, subapical plate elongate.

Remarks. Betrichia nhundiaquara sp. nov. is similar to B. zilbra , B. occidentalis Flint 1974 , B. kagyla Oláh & Flint 2011 , and B. varratlana Oláh & Flint 2011 in the presence of two ocelli in males (males of remaining Betrichia species have three ocelli), inferior appendages fused and digitiform, and subgenital plate wide dorsally and directed posteroventrad in lateral view. The new species can be distinguished from these species by its sternum VIII posterolateral corners produced caudally into slender processes while in the other species the sternum is truncate. Processes of segment VIII are also found in B. longistyla ; however, in the latter species each process bears an apical spine. In addition, segment IX of the new species has a dorsomedian depression bearing setae on its edges. Betrichia nhundiaquara sp. nov. can be distinguished from all congeners by the spear-like sclerite in the phallus.

Etymology. The specific name is a reference to the type-locality of the new species.

Material examined. Holotype. BRAZIL: Paraná: Morretes, Rio Nhundiaquara , 25°25'25''S, 48°54'0''W, 89 m, 24.i.2011, APM Santos, DM Takiya & JL Nessimian cols., light trap, 1 male ( DZRJ). Paratypes. Bahia: Igatu, Pousada Flor de Açussena, 12°53'46''S, 41°19'08''W, 679 m, DM Takiya col., light trap, 6 males ( DZRJ); Mucugê, Parque Sempre Viva, Recumbuca, 12°59'57''S, 41°20'50''W, 909 m, 25.vi.2010, AR Calor & F. Quintero cols., Malaise trap, 3 males (MZUFBA); Minas Gerais: Ribeirão Mascates, 19º24’33”S, 43º34’35”W, 814 m, 11.xii.2011, APM Santos & DM Takiya cols., 2 pharate adults ( DZRJ). Paraná: Same data as holotype, 2 males ( DZRJ); Piauí: Piracuruca, Parque Nacional de Sete Cidades, Riacho Piedade, 04°06'34''S, 41°43'39''W, 169 m, 19.iv.2012, DM Takiya col., light trap, 1 male ( CZMA).

Figures

FIGURE 1 A – D. Betrichia nhundiaquara sp. nov. Male genitalia: A, ventral; B, dorsal; C, left lateral; D, phallus, dorsal; E. phallus, left lateral. Scale: 0.1 mm.