Neotrichia anaua, 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 : 180-181

Neotrichia anaua sp. nov.

Figures: 1A–1D

Diagnosis This species does not fit well into any of the Species Groups of Marshall (1979) as defined by Keth et al. (2015). The male of Neotrichia anaua sp. nov. is similar to that of Neotrichia rambala Harris & Armitage 2019 in the triangular aspects of segments IX and X (lateral view), in the spatulate bracteole, and in the long and apically tapering inferior appendages. The new species differs from N. rambala by the beak-like shape of the subgenital plate in lateral view ( Fig. 1A , sg) and by the apex of the phallus with a long, robust, sclerotized, and apically curved hook ( Fig. 1D , pa).

Description. Male (in alcohol): Dark brown, with length of each forewing 1.4 mm (holotype). Postoccipital setal warts pronounced, large, ovoid. Antennae 18-articulated; 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.

Male genitalia. Segment IX in lateral view retracted in segment VIII, with anterolateral margins produced anterad at midheight ( Fig. 1A ), deep anterior excisions present both in ventral and dorsal views, ventral excision almost triangular ( Fig. 1B ), dorsal excision rounded ( Fig. 1C ); dorsal surface covered with microtrichia; posterolateral margin sinuous, heavily sclerotized; midheight thicker than on other margins ( Fig. 1A ) with membranous and short process hidden by bracteoles and bearing an apical seta (dotted lines in Figs. 1A, 1B , mp). Segment X fused with dorsum of segment IX; in lateral view almost triangular and with truncate apex ( Fig. 1A ); in dorsal view broadly emarginated distally with pair of posterolateral rounded membranous lobes each covered with microtrichia; basomesal area (where segment X fused to segment IX) also covered by microtrichia ( Fig. 1C ). Subgenital plate in lateral view narrowing to downturned beak-like apex ( Fig. 1A , sg); in ventral view wide basally narrowing to apical V-shaped incision flanked by small setae ( Fig. 1B , sg). Bracteoles spatulate in lateral view ( Fig. 1A , br), digitiform both in dorsal and ventral views ( Figs 1B, 1C , br). Inferior appendages tapering to blunt apices in lateral view ( Fig. 1A , ia), robust and completely separated in ventral view, inner margins each with median seta and subapical seta ( Fig. 1B , ia). Phallus, in dorsal view, narrow with median constriction giving rise to flat, ribbon-like, membranous apical portion with long, robust, sclerotized, and apically curved hook ( Fig. 1D , pa); paramere tubular, encircling shaft and extending posterad to phallus apex ( Fig. 1D , pr); ejaculatory duct ending terminally ( Fig. 1D , 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 “ anaua ” is a noun used in apposition, referring to the Anauá River, an eastern tributary of the Branco River.

Figures

FIGURE 1. Neotrichia anaua sp. nov., male genitalia: 1A, left lateral; 1B, ventral; 1C, dorsal; 1D, phallus, dorsal. br = bracteole (paired), ed = ejaculatory duct, ia = inferior appendage (paired), mp = membranous posterolateral process of segment IX (paired), pa = phallus apical portion, pr = paramere, sg = subgenital plate.