Additional six new species of Neotrichia Morton 1905 (Insecta: Trichoptera Hydroptilidae) from Roraima state, Brazil Author Neto, Jaime De Liege Gama 0000-0003-3670-3894 Universidade Estadual de Roraima-UERR, Coordenação de Ciências Biológicas e da Saúde. & jaimebio @ hotmail. com; https: // orcid. org / 0000 - 0003 - 3670 - 3894 jaimebio@hotmail.com Author Passos, Mahedy Araujo Bastos 0000-0001-9423-4403 Centro Estadual de Educação Profissional Prof. Antônio de Pinho Lima (CEEP / RR). & mahedypassos @ hotmail. com; https: // orcid. org / 0000 - 0001 - 9423 - 4403 mahedypassos@hotmail.com text Zootaxa 2020 2020-11-18 4881 1 179 188 journal article 8003 10.11646/zootaxa.4881.1.11 b0e3126c-4b5a-413a-b46f-7456fffe326b 1175-5326 4425658 4083C6BC-10C2-47EF-A95C-0F64BF26F986 Neotrichia xereuini sp nov. Figures: 6A–6D 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 xereuini sp. nov. is similar to that of Neotrichia orlandoi Santos & Nessimian 2009 in that the posteroventral margin of segment IX is produced into a long lobe in ventral view ( Fig. 6B ) and the subgenital plate is bifid ( Fig. 6A , sg). The new species differs from N . orlandoi by lacking a sclerotized process on the posterodorsal margin of segment IX, by having subapical dilations of the inferior appendages ( Fig. 6B ), and by the phallus ending in a pair of sharply bent apical processes ( Fig. 6D ). Description . Male (in alcohol): Dark brown, with length of each forewing 1.3 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 with anterior margin convex; metascutellum convexly subtriangular. Male genitalia. Segment IX with anterolateral margins rounded in lateral view ( Fig. 6A ), segment IX subquad-rate with subquadrate anterodorsal incision in dorsal view ( Fig. 6C ) and with broadly rounded and shallower anteroventral incision in ventral view ( Fig. 6B ); posteroventral margin produced into mesal, long and apically rounded lobe ( Fig. 6B , pvm); in lateral view posterolateral margins sinuous, with paired slender membranous processes much shorter than segment X, each bearing one apical seta ( Fig. 6A , mp). Bracteoles absent. Segment X fused with dorsum of segment IX; quadrate with membranous apex truncate in lateral and dorsal views ( Figs. 6A, 6C ). Subgenital plate in lateral view bifid distally, dorsal branch produced posterad and tapering to acute apex flanked by pair of elongate setae; ventral branch produced ventrad, longer, tapering to acute apex ( Fig. 6A , sg); in ventral view wide basally, dorsal branch narrowing distally to acute medial process flanked by pair of elongate setae, ventral branch drop-like ( Fig. 6B , sg). Inferior appendages long and bifid; in lateral view, each with lateral process slender and tapered to acute apex; mesal process slender, produced ventrally and nearly hidden by lateral process, slightly tapered to apex having single apical seta ( Fig. 6A , ia); in ventral view, lateral process dilated subapically, tapering to acute apex; mesal process about one-half length of dorsal process, slender, narrowing distally and bearing apical seta ( Fig. 6B , ia). Phallus elongate with wide tubular base narrowing to median constriction; paramere encircling shaft and extending posterad half length of phallus apical portion and hooked anterad apically ( Fig. 6D , pr); apical portion slender, ending in pair of heavily sclerotized and sharply bent processes at apex, lower process curving upward in dorsal view ( Fig. 6D ); ejaculatory duct protruding subapically ( Fig. 6D , ed). FIGURE 6. Neotrichia xereuini sp. nov. , male genitalia: 6A, left lateral; 6B, ventral; 6C, dorsal; 6D, phallus, dorsal. ed = ejaculatory duct, ia = inferior appendage (paired), mp = membranous posterolateral process of segment IX (paired), pr = paramere, pvm = posteroventral margin of segment IX, sg = subgenital plate. 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 “ xereuini ” is a noun used in apposition, referring to the Xereuini River, a western tributary of the Branco River.