Flintiella triaena, Neto & Ribeiro & Passos, 2020

Neto, Jaime De Liege Gama, Ribeiro, José Moacir Ferreira & Passos, Mahedy Araujo Bastos, 2020, Two new species of Flintiella Angrisano 1995 (Trichoptera: Hydroptilidae Stactobiini) from northern Brazil, Zootaxa 4890 (2), pp. 283-288 : 286-287

Flintiella triaena sp nov.

Figs 3 A–3E

Diagnosis. Male of Flintiella triaena sp. nov. is very distinctive with no clearly similar congeners. The trident-like subgenital plate bearing 3 digitiform processes fused basally and heavily sclerotized apically in ventral view are unique to the new species.

Description. Male. Length 1.5 mm (Holotype, from front of head to apices of folded wings). General color pale yellow (in alcohol). Head without modifications. Antennae without modifications, each with 18 articles. Tibial spur formula 0-2-3. Fore- and hindwing venation reduced to basal veins. Mesoscutellum with transverse suture. Metascutelum rectangular, short and wide. Abdomen without visible modifications. Segment VII without mesoventral process.

Male genitalia. Abdominal segments VII and VIII annular. Segment IX reduced ventrally; in dorsal view, with anterolateral margins developed as slender, elongate rods extending through segment VII; with pair of setose lumps near posterior margins subdorsally ( Fig. 3B, 3C ). Segment X membranous, fused with dorsum of segment IX; in dorsal view with deeply incised apex ( Fig. 3C ); in lateral view oblong and with ventral membranous lobe ( Fig. 3A ). Subgenital plate in ventral view resembling trident, broad basally, narrow at midlength, bearing 3 digitiform processes fused basally and heavily sclerotized apically; mesal process slightly narrowed medially ( Fig. 3B , sg); in lateral view, lateral processes overlaid, only one process visible ( Fig. 3A ). Inferior appendages subrectangular in lateral view, thicker basally, tapered and blunt apically ( Fig. 3A , ia); in ventral view, each with mesal margin irregularly and obliquely tapered from midlength to acute apex; holotype with inferior appendages spread posterolaterad, possibly as result of KOH treatment ( Fig. 3B ). Phallus tubular, deeply divided distally, each lobe spatulate subapically and narrowing to acute apex; ejaculatory duct protruding mesally ( Fig. 3D, 3E ).

Female, larva, pupa and egg. Unknown.

Holotype male. BRAZIL: Pará: S„o Geraldo do Araguaia Municipality, Serra das Andorinhas, Santa Cruz stream, 06°13’31.1”S, 48°26’28.1”W, 124 m a.s.l., 18–31 Oct. 2019. Luís de Queiroz (modified) light trap, J.M.F. Ribeiro, leg. ( INPA).

Distribution: Brazil (Pará).

Etymology. The specific name “ triaena ” is a noun in apposition (from the Greek feminine noun triaena = a trident) referring to the subgenital plate resembling a trident in ventral view.

Figures

FIGURE 3. Flintiella triaena sp. nov., male genitalia: 3A, left lateral; 3B, ventral; 3C, dorsal; 3D, 3E, phallus: 3D, dorsal; 3E, left lateral. ia = inferior appendages (paired); sg = subgenital plate.