Betrichia zilbra Mosely 1939

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 : 293

Betrichia zilbra Mosely 1939 ( Fig 2A –E)

Betrichia zilbra Mosely 1939 , 231 [type-locality: Brazil, Edo. Santa Catarina, Nova Teutonia; repository of holotype: BMNH, male]; Angrisano 1995, 505 [distribution].

Description. Adult male. Length (from tip of head to wing apices) 2.5–3.0 mm. General color light brown (in alcohol). Head without modifications. Antennae simple with 20 antennomeres; scape slightly flattened, other antennomeres cylindrical. Ocelli 2. Tibial spur formula 1-3-4. Venation of anterior wings distinct, veins reaching wing margin. Posterior wing venation distinct; with long setae on anal margins. Mesoscutellum with transverse suture. Metascutellum pentagonal. Abdomen without visible modifications. Segment VII with mesoventral process.

Male genitalia. Segment VIII shorter dorsally than ventrally; sternum with posteroventral margin truncate with long setae; tergum posterodorsal margin broadly concave. Segment IX internalized in segment VIII, open ventrally. Inferior appendages completely fused to each other, short; in ventral view, tapered to blunt apex; in lateral view narrow over length. Subgenital plate as long as the inferior appendages, wide ventrally; in lateral view, directed posteroventrad with tiny setae at narrow apex. 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; with sclerotized plate and spine-like processes apically.

Remarks. Betrichia zilbra resembles B. occidentalis in the presence of two ocelli in these species and by similarities in the male genitalia. According to Flint (1974), these species can be separated only by the sclerotized plate of the phallus, which bears some small processes in B. zilbra and a pair of long spines in B. occidentalis . This species is reported from the Northeastern Region in Brazil for the first time in Bahia and Sergipe states.

Material examined. BRAZIL: Bahia [new record]: Camacan, Rio Panelão em frente à fazenda Porangaba, 15°24'28''S, 39°32'0''W, 161 m, 1.iii.2012, DM Takiya col., light trap, 1 male ( DZRJ); Camacan, Fazenda Waldemar Farmácia, acima da represa de abastecimento, 15°25'17''S, 39°34'0''W, 5.viii.2008, AR Calor col., light trap, 1 male (MZUFBA). Sergipe [new record]: Itabaiana, Parque Nacional da Serra de Itabaiana, Riacho Vermelho na propriedade particular, 10°44'15''S, 37°20'13''W, 198 m, 17.vi.2014, DM Takiya, APM Santos, AC Domahovski & WRM Souza cols., light trap, 2 males ( DZRJ); same data, except Riacho Coqueiro, 10°44'02''S, 37°20'22''W, 1 males ( DZRJ); same data, except Riacho dos Negros, 10°44'50''S, 37°20'24''W, 202 m, 42 males ( DZRJ); Santa Catarina, [Seara], Nova Teutônia, 27º11’S, 52º23’W, xi.1963, F Plaumann col., det. OS Flint Jr, 1975, 1 male ( NMNH). Same data, except i.1963, 3 males ( NMNH). Same data, except ix.1963, 28 males ( NMNH). Same data, except i.1964, 14 males ( NMNH). Same data, except 300–500 m, ii.1964, 30 males ( NMNH). ARGENTINA [new record]: Misiones, Arroyo Piray Mini, W Dos Hermanos, 23.xii.1973, OS Flint Jr col., det. Flint, 10 males ( NMNH). Arroyo Piray Guazú, N San Pedro, 22.xi.1973, OS Flint Jr col., det. OS Flint Jr, 1 male ( NMNH).

Figures

FIGURE 2 A – D. Betrichia zilbra. Male genitalia: A, ventral; B, dorsal; C, left lateral; D, phallus, dorsal; E. phallus, left lateral. Scale: 0.1 mm.