Oxyethira (Tanytrichia) librina Neto & Passos 2022, sp. nov.
Creators: name: Neto, Jaime De Liege Gama
name: Passos, Mahedy Araujo Bastos
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Hydroptilidae
Oxyethira
Oxyethira librina

description: Oxyethira (Tanytrichia) librina sp. nov.
Fig. 2A–2D
Diagnosis. This new species is tentatively placed in the Tanytrichia subgenus of Kelley (1984) due to segment VII lacking an apicomesal ventral process; segment VIII lacking dorsolateral processes and having its venter excised to the anterior margin; segment IX venter being elongate, protruding anteriorly into segment VI; subgenital processes being fused distomesally; and aedeagus having 2 long, lateral processes beginning at midlength. The male of Oxyethira (Tanytrichia) librina is similar to that of O. hozosa Harris & Davenport 1999 in segment IX having one narrow process posteroventrally in lateral and ventral views. However, in the new species that process in ventral view is produced into a long mesoventral process with a subapical constriction and a rounded apex while in O. hozosa that process is a pair of finger-like mesoventral processes.
Description. Male. Length of each forewing 1.55 mm (n = 6). Head unmodified, with 3 ocelli; antennae broken and lost. Tibial spurs 1,3,4. Dorsum of head dark brown with pale yellow setae; thorax dark brown dorsally, light brown ventrally, with pale yellow setae dorsally; leg segments with light brown setae. Forewing venation typical of the genus, covered with fine yellow setae and small scattered patches of dark brown setae.
Male Genitalia. Abdominal segment VII annular, without apicomesal ventral process (Fig. 2A). Segment VIII in lateral view with posteroventral margins oblique and produced caudad (Fig. 2A); in dorsal view anterior margin slightly convex, posterior margin difficult to define (Fig. 2B); in ventral view anterior margin slightly convex, posterior margin deeply excised mesally (Fig. 2C). Segment IX in lateral view tapering anteriorly and withdrawn into segments VII–VIII, extending slightly beyond anterior margin of segment VII, posterior margin with five slender caudad processes, one pair dorsal (Fig. 2A, dp), another pair mesal (Fig. 2A, mp), and one unpaired posterior mesoventral (Fig. 2A, mvp); in dorsal view, dorsal processes digitate, reaching posterior margin of tergum X (Fig. 2B, dp), mesal processes longer, digitate, and slightly convergent apically (Fig. 2B, mp); in ventral view lateral margins slightly sinuous, anterior margin almost straight, posterior mesoventral process as long as inferior appendages, with subapical constriction and rounded apex (Fig. 2C, mvp). Tergum X in lateral view membranous, vertically oblong (Fig. 2A); in dorsal view posterior margin shallowly incised mesally (Fig. 2C). Inferior appendages in lateral view sclerotized, tapering apically (Fig. 2A, ia); in ventral view broad basally, tapering to blunt apices (Fig. 2C, ia). Subgenital process membranous, in lateral view tapering apically, protruding below inferior appendages (Fig. 2A, sg); in dorsal view produced into pair of mesal processes with lateral setae (Fig. 2B, sg). Bilobed processes digitate, each with spine-like apical seta, visible only in lateral view (dotted lines in Fig. 2A, bp). Phallus tubular, smoothly curved about 45° in middle, in lateral view apical half membranous tapering to acute apex, with sclerotized, upturned and acute basal process (Fig. 2D, sp; paired); in dorsal view fixed to dorsum of segment IX by pair of lateral sinuous apodeme (Fig. 2E and dotted lines in Fig. 2B, ap), acute apex with a pair of sclerotized lateral process (Fig. 2E, sp); ejaculatory duct not visible.
Female, pupa, larva, and egg: Unknown.
Holotype male. BRAZIL: Roraima: Boa Vista municipality, Cauamé River, praia do Caçari, 2°51’29” N; 61°22’42” W, 04 Dez. 2020. Pennsylvania light trap, J.L. Gama Neto, col. (alcohol; MPEG).
Paratype. 5 males, same data as holotype (alcohol; UERR).
Distribution: Brazil (Roraima state)
Etymology. The term “librina”, a noun used in apposition, refers to the oral word used by inhabitants of Roraima states to designate a light rain falling on the vegetation.
description: Published as part of Neto, Jaime De Liege Gama & Passos, Mahedy Araujo Bastos, 2022, Two new species of Oxyethira Eaton 1873 (Trichoptera: Hydroptilidae) from Roraima state, Brazil, pp. 26-30 in Zootaxa 5169 (1) on pages 28-30, DOI: 10.11646/zootaxa.5169.1.2, http://zenodo.org/record/6911221