Neotrichia pavula, Neto & Ribeiro & Passos, 2021

Neto, Jaime De Liege Gama, Ribeiro, José Moacir Ferreira & Passos, Mahedy Araujo Bastos, 2021, The genus Neotrichia Morton 1905 (Trichoptera: Hydroptilidae) in Pará state Northern Brazil: New species and an unpublished species made available, Zootaxa 5082 (2), pp. 118-128 : 124-125

Neotrichia pavula sp. nov.

Figs 5A–5D

Diagnosis. This species does not fit well into any of the species groups of Marshall (1979) as defined by Keth et al. (2015). Although the bifurcate inferior appendages resemble those of members of the N. canixa Group, the male genitalia of N. pavula sp. nov. do not have the divided bracteoles and the sclerotized horns projecting from the apex of segment X, typical of the N. canixa Group. The male of N. pavula sp. nov. resembles those of N. browni Harris 1990 , N. colmillosa Harris 1990 , and N. orejona Harris & Davenport 1999 by segment IX having long processes which curve ventrad and then caudad in lateral view. These species are easily differentiated by the curved processes of segment IX, in dorsal view, parallel, sinuous, and convergent apically in the new species, crisscrossed in N. colmillosa and N. browni , and parallel and both curved right laterad apically in N. orejana .

Description. Male (in alcohol): Dark brown with length of each forewing 1.8 mm (holotype and 1 paratype). Postoccipital setal warts pronounced, large, ovoid. Antennae each with 18 articles; scape normal, cylindrical, slightly longer than pedicel; flagellomeres as long as pedicel, cylindrical. Maxillary palp formula I-II-IV-III-V (shortest to longest), first two articles extremely short, shorter than wide. Mesoscutellum anterior margin convex; metascutellum convexly subtriangular. Sternum VII without apicomesal process.

Male genitalia. Segment IX arising from within segment VIII, with pair of dorsal setal lobes ( Figs 5A, 5C , dsl) and pair of ventrolateral sickle-like processes curved ventrad basally and then caudodorsad apically ( Figs 5A–5C , vlp); anterolateral margins convex and produced anterad below midheight in lateral view ( Fig. 5A ); anterodorsal margin broadly U-shaped in dorsal view ( Fig. 5C ); anteroventral margin distinctly concave in ventral view ( Fig. 5B ); posterolateral margins in lateral view truncate and slightly sclerotized, each with membranous apicolateral projection much shorter than segment X, slightly upturned, bearing two apical setae ( Figs 5A–5C , ap); each membranous posterolateral margin below membranous projection with single seta ( Figs 5A, 5B , plm). Segment X fused with dorsum of segment IX; in lateral view, membranous with rounded apex; in dorsal view, posteriorly with V-shaped incision, separating pair of posterolateral triangular lobes; ventrolateral processes protruding beyond segment X and curved mesad apically ( Fig. 5A , vlp). Subgenital plate, in lateral view, with ventromesal process apically truncate; in ventral view, slightly triangular with pair of subapicomesal setae. Bracteoles absent. Inferior appendages bifid in both lateral and ventral views ( Figs 5A, 5B ); in lateral view, each with dorsolateral process robust, tapered, and almost straight; ventromesal process about 1/2 length of dorsolateral process, tapered and straight, with single apical seta ( Fig. 5A , ia); in ventral view, dorsolateral process robust, tapered and curved slightly inward apically; ventromesal process tapered and bearing apical seta ( Fig. 5B , ia). Phallus elongate with wide tubular base narrowing to median constriction; paramere encircling shaft and extending posterolaterad about 1/3 length of apical portion ( Fig. 5D , pr); apical portion sclerotized, ending in pair of acute processes at apex sharply angled laterad ( Fig. 5D , pa); ejaculatory duct protruding subapically ( Fig. 5D , ed).

Female, larva, pupa, and egg. Unknown.

Holotype male. BRAZIL: Pará: São Geraldo do Araguaia municipality, Serra das Andorinhas, Igarapé xambioazinho, 6°10’20.07” S, 48°33’53.15” W, 30. Oct. 2017, Pennsylvania trap, Ribeiro, J.M.F, leg. (alcohol; MPEG).

Paratype. 1 male, same data as holotype (alcohol; UERR) .

Distribution: Brazil (Pará, type locality only).

Etymology. The epithet “pavula” is a non-Latin adjective with invariant gender referring to a popular oral word used by the inhabitants of Pará State (“pávula” = stuck-up) to emphasize that someone is arrogant.

Figures

FIGURE 5. Neotrichia pavula sp. nov., male genitalia. 5A, left lateral; 5B, ventral; 5C, dorsal; 5D, phallus, left lateral. Abbreviations: ap = apicolateral projection (paired), ed = ejaculatory duct, ia = inferior appendage (paired), plm = posterolateral margin (paired), pr = paramere, sg = subgenital plate, vlp = ventrolateral sickle-like process (paired).