Oxyethira (Tanytrichia) librina, Neto & Passos, 2022

Neto, Jaime De Liege Gama & Passos, Mahedy Araujo Bastos, 2022, Two new species of Oxyethira Eaton 1873 (Trichoptera: Hydroptilidae) from Roraima state, Brazil, Zootaxa 5169 (1), pp. 26-30 : 28-30

publication ID	https://doi.org/ 10.11646/zootaxa.5169.1.2
publication LSID	lsid:zoobank.org:pub:6B94A107-1A27-4A1B-B693-340F61A382EF
DOI	https://doi.org/10.5281/zenodo.6911199
persistent identifier	https://treatment.plazi.org/id/FD0B6C4A-8435-A756-1C8A-3100875BFE3F
treatment provided by	Plazi
scientific name	Oxyethira (Tanytrichia) librina
status	sp. nov.

Treatment

Oxyethira (Tanytrichia) librina sp. nov.

Fig. 2A–2D View FIGURE 2

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 View FIGURE 2 ). Segment VIII in lateral view with posteroventral margins oblique and produced caudad ( Fig. 2A View FIGURE 2 ); in dorsal view anterior margin slightly convex, posterior margin difficult to define ( Fig. 2B View FIGURE 2 ); in ventral view anterior margin slightly convex, posterior margin deeply excised mesally ( Fig. 2C View FIGURE 2 ). Segment IX in lateral view tapering anteriorly and withdrawn into segments VII–VIII, extending slightly beyond anterior margin of segment VII, posterior margin with five slender caudad processes, one pair dorsal ( Fig.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 View FIGURE 2 , dp), another pair mesal ( Fig. 2A View FIGURE 2 , mp), and one unpaired posterior mesoventral ( Fig. 2A View FIGURE 2 , mvp); in dorsal view, dorsal processes digitate, reaching posterior margin of tergum X ( Fig. 2B View FIGURE 2 , dp), mesal processes longer, digitate, and slightly convergent apically ( Fig. 2B View FIGURE 2 , 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 View FIGURE 2 , mvp). Tergum X in lateral view membranous, vertically oblong ( Fig. 2A View FIGURE 2 ); in dorsal view posterior margin shallowly incised mesally ( Fig. 2C View FIGURE 2 ). Inferior appendages in lateral view sclerotized, tapering apically ( Fig. 2A View FIGURE 2 , ia); in ventral view broad basally, tapering to blunt apices ( Fig. 2C View FIGURE 2 , ia). Subgenital process membranous, in lateral view tapering apically, protruding below inferior appendages ( Fig. 2A View FIGURE 2 , sg); in dorsal view produced into pair of mesal processes with lateral setae ( Fig. 2B View FIGURE 2 , sg). Bilobed processes digitate, each with spine-like apical seta, visible only in lateral view (dotted lines in Fig. 2A View FIGURE 2 , 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 View FIGURE 2 , sp; paired); in dorsal view fixed to dorsum of segment IX by pair of lateral sinuous apodeme ( Fig. 2E View FIGURE 2 and dotted lines in Fig. 2B View FIGURE 2 , ap), acute apex with a pair of sclerotized lateral process ( Fig. 2E View FIGURE 2 , 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). GoogleMaps

Paratype. 5 males, same data as holotype (alcohol; UERR) GoogleMaps .

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.