Flintiella triaena Gama Neto, Ribeiro & Passos 2020

Cavalcante-Silva, Amanda, Santos, Allan Paulo Moreira & Calor, Adolfo Ricardo, 2025, Three new species of Stactobiinae (Trichoptera: Hydroptilidae), new distributional records, and an updated checklist for Brazil, Zootaxa 5659 (1), pp. 87-103 : 95-96

Flintiella triaena Gama Neto, Ribeiro & Passos 2020

( Figures 5A–5G )

Gama Neto, Ribeiro & Passos 2020 [ type locality: Pará, São Geraldo do Araguaia Municipality , Serra das Andorinhas, Santa Cruz stream, 06°13’31.1”S, 48°26’28.1”W, el. 124 m, 18–31.x.2019, INPA, male] .

Material examined. HOLOTYPE. BRAZIL: Pará: São Geraldo do Araguaia Municipality, Serra das Andorinhas, Santa Cruz stream, Luís de Queiroz (modified) light trap, 06°13’31.1”S, 48°26’28.1”W, el. 124 m, 18–31.x.2019, J.M.F Ribeiro leg., 1 male ( INPA). Mato Grosso: P.N. Chapada dos Guimarães, Poço das Antas, 15°18’50”S, 55°51’10”W, el. 289 m, 10.ii.2015, D.M. Takiya & A.P.M. Santos leg., 1 male ( DZRJ 7651 ); same river, coordinates, elevation, and date except 2 males ( DZRJ 7656 ).

Taxonomic comments. Flintiella triaena was described based on a unique specimen. The original description indicated for the genitalia that the inferior appendages were “spread posterolaterad, possibly as a result of KOH treatment” ( Gama Neto et al. 2020). The authors also mentioned the unusual “trident-like” subgenital plate, allowing the identification of the species. However, based on our reexamination of the holotype and comparison with two additional specimens from the state of Mato Grosso, we confirm that the inferior appendages and the arms of the subgenital plate of the holotype appear to have been separated during the clearing process. In this way, Flintiella triaena has the typical male genitalia as other species in this genus with the subgenital plate divided into three contiguous arms as long as the inferior appendages ( Figs 5D, 5E ). Based on male genitalia ( Figs 5C–5 G and Gama Neto et al. 2020, figs 3A–3E), F. triaena resembles F. carajas , particularly in the shape of the inferior appendages and the subgenital plate. However, F. triaena can be easily distinguished by: (1) sternite VII without an apicomesal process ( Figs 5D, 5E and Gama Neto et al. 2020, fig. 3A); (2) segment IX has a mesal U–shaped notch posteroventrally in ventral view ( Fig. 5D and Gama Neto et al. 2020, fig. 3B, but broader in the latter illustration); (3) each inferior appendage has a short subapical projection in the ventromesal margin ( Fig. 5D and Gama Neto et al. 2020, fig. 3B); (4) the subgenital plate is divided into three contiguous arms as long as inferior appendages ( Fig. 5D and Gama Neto et al. 2020, fig. 3B, but divergent in the latter illustration, apparently as a result of the clearing process); and (5) the phallus is deeply divided distally, with a mesoventral process and the ejaculatory duct protruding from its apex ( Figs 5F, 5 G and Gama Neto et al. 2020, figs 3D, 3E). Here, we also describe and provide the first illustration of the wing venation of the male of F. triaena . Fore- and hind wings with main veins present. Forewings, in alcohol, uniformly brown, with light brown setae; each with Sc incomplete, apical forks 1, 2, and 3 present ( Fig. 5A ). Hind wings narrow; Sc incomplete; apical forks 1 and 2 present ( Fig. 5B ); edges with long setal fringes.

Distribution. Brazil (PA and MT [new record]).

Figures

FIGURE 5. Flintiella triaena, male: 5A, right forewing, dorsal; 5B, right hind wing, dorsal; 5C–5G, genitalia: 5C, dorsal; 5D, ventral; 5E, left lateral; 5F, phallus, dorsal; 5G, phallus, left lateral. Scale = 0.1 mm.