Neotrichia cauame, Neto & Passos, 2020

Neto, Jaime De Liege Gama & Passos, Mahedy Araujo Bastos, 2020, Additional six new species of Neotrichia Morton 1905 (Insecta: Trichoptera Hydroptilidae) from Roraima state, Brazil, Zootaxa 4881 (1), pp. 179-188 : 182-183

Neotrichia cauame sp. nov.

Figures: 3A–3D

Diagnosis. This species belongs to the Neotrichia caxima Species Group of Marshall (1979) as defined by Keth at al. (2015), based on the inferior appendages reduced and not longer than wide, and segment X wrapping around the subgenital plate. The male of Neotrichia cauame sp. nov. is similar to that of Neotrichia rotundata and Neotrichia damurida in the highly reduced inferior appendages and the general aspect of tergum X ( Figs. 3A, 3C ). The new species differs from those two species by the spiraled hook of the phallus apex ( Fig. 3D ).

Description. Male (in alcohol): Dark brown, with length of each forewing 1.1 mm (holotype). Postoccipital setal warts pronounced, large, ovoid. Antennae each with 18 articles; scape normal, cylindrical, slightly longer than pedicel; flagellomeres each as long as pedicel, cylindrical. Maxillary palp formula I-II-IV-III-V (shortest to longest), first two articles shorter than wide. Mesoscutellum anterior margin convex; metascutellum convexly subtriangular. Sternum VII with apicomesal process.

Male genitalia. Segment IX retracted in segment VIII, in lateral view with anterolateral margins produced anterad below midheight ( Fig. 3A ); anterodorsal margin deeply concave in dorsal view ( Fig. 3C ), anteroventral margin V-shaped ( Fig. 3B ), posteroventral margin concave and with pair of heavily sclerotized mesal processes in ventral view ( Figs 3A, 3B , smp). Segment X membranous, fused with dorsum of segment IX; with large oblong apex in lateral view ( Fig. 3A ); in dorsal and ventral views subquadrate with broadly emarginate posteromesal margin ( Figs 3B, 3C ). Subgenital plate in lateral view oblong ( Fig. 3A , sg); in ventral view wide basally narrowing distally to sharp medial point flanked by pair of long setae ( Fig. 3B , sg). Inferior appendages highly reduced in lateral view ( Fig. 3A , ia); in ventral view ellipsoid, apically blunt, each with produced and heavily sclerotized inner mesal margin ( Fig. 3B , ia). Phallus elongate with broad tubular base narrowing to median constriction; paramere encircling shaft and extending posterad ( Fig. 3D , pr); apical portion tapered, slender with short and heavily sclerotized and spiraled basal process; ejaculatory duct protruding apically ( Fig. 3D , ed).

Female, larva, pupa, and egg. Unknown.

Holotype male. BRAZIL: Roraima: Iracema municipality, Vicinal Campos Novos (Fazenda Rancho Fundo), small order stream, 2°21’26.22”N, 61°23’38.98”W, 209 m a.s.l., 16 Mar. 2018, Pennsylvania light trap, J.L. Gama Neto, leg. (alcohol; MPEG).

Distribution: Brazil (Roraima, type locality only).

Etymology. The specific name “ cauame ” is a noun used in apposition, referring to the Cauamé River, a western tributary of the Branco River.

Figures

FIGURE 3. Neotrichia cauame sp. nov., male genitalia. 3A, left lateral; 3B, ventral; 3C, dorsal; 3D, phallus, dorsal. ed = ejaculatory duct, ia = inferior appendage (paired), pr = paramere, sg = subgenital plate, smp = sclerotized mesal process (paired).