Xiphocentron (Sphagocentron) eurybrachium Vilarino & Calor 2024, sp. nov.
Creators: name: Vilarino, Albane
name: Calor, Adolfo R.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Xiphocentronidae
Xiphocentron
Xiphocentron eurybrachium

description: Xiphocentron (Sphagocentron) eurybrachium sp. nov.
Figures 7 A – F
Type material.
Holotype: VENEZUELA • ♂; Falcón, Mitare river, near San Luis, 11 ° 07.930 ′ N, 69 ° 39.184 ′ W, el. 589 m, 07. vi. 2001, Holzenthal, Blahnik, Paprocki, Cressa leg., UMSP 000074031. — Paratypes: VENEZUELA • 6 ♂; same data as holotype, UMSP 000074032, 000074033, 000074034, 000074035, 000074036, 000074037.
Diagnosis.
Xiphocentron eurybrachium sp. nov. is mostly similar to Xiphocentron (S.) dactylum sp. nov.. However, X. eurybrachium sp. nov. can be differentiated mainly by the presence of the following characters: (1) the preanal appendage in lateral view conspicuously wide subapically (2 × wider than basal section), without narrow digitate projection; (2) inferior appendage basal region (coxopodite) with small spine-like setae in ventral view, apex curved dorsolaterally in dorsal view; (3) paraproct ventroapical lobe wide (as wide as preanal appendage basal section) (narrow or indistinct in the other species); (4) sternum IX trapezoid, posterior margin without incision; (5) sternum V with a digitate lateral projection.
Description.
Male: Forewing length 3.5–3.8 mm (n = 7). Wing without spots. Color overall brown, forewing uniformly dark brown. Maxillary palp segment length formula (I = II = III) <IV <V. Tibial spur formula 2: 4: 3; spurs unmodified. Forewing forks II and IV present; fork II sessile at discoidal cell; discoidal cell 3 / 4 as long as thyridial cell, very conspicuous nygmata. Hind wing forks II and V present (Fig. 7 A). Sternum V with elongate, digitate, lateral glandular process (Fig. 7 F).
Genitalia (Figs 7 B – E). Tergum IX, in lateral view, wide basally, narrower apically (Fig. 7 B); in dorsal view, anterior margin substraight; posterior margin with very narrow incision (Fig. 7 C). Sternum IX, in lateral view, length more than 2 × as long as high, apex subtruncate, posterior margin concave, with a posterobasal short projection, anterior apodeme short, wide (Fig. 7 B); in ventral view, about as long as wide, posterior margin slightly produced posterad, mesally convex, with a posteromesal, short projection (Fig. 7 D). Tergum X membranous fused dorsally to each paraproct (Figs 7 B, 7 C). Paraproct, in lateral view, oblong, narrow basaly, wider apically, apex subtruncate, with wide round ventroapical lobe (Fig. 7 B); in dorsal view, wide basally, narrowed mesally and wide apically, divided apicomesally, each side fused at midlenght, with narrow sclerotized mesal band, apex with line of sparse sensillae (Fig. 7 C). Preanal appendage, in lateral view, setose, about 2.5 × as long as tergum IX, wide, substraight throughout length, apically wide, 2 × as wide as base, with short, narrow projection (Fig. 7 B); in dorsal view, narrow and curved mesally throughout length, tapered apically (Fig. 7 C). Inferior appendage, in lateral view, about 2.5 × as long as tergum IX, coxopodite and harpago completely fused to each article, inner face with longitudinal area of dense, long spine-like setae, spine-like setae shorter towards base, with multiple lines of regular setae from midlenght to apex (Fig. 7 B), (Fig. 7 D); basal region (coxopodite) wide, with several basomesal short spine-like setae, mesal sclerite region indistinct (Fig. 7 B); apical region (harpago) narrow, digitate, 2 × as long as basal region, apex slightly globose and curved dorsally; (Fig. 7 B); basal plate in lateral view, wide, anteriorly with long, narrow flange (Fig. 7 B). Phallus tubular, very long and narrow, reaching segment V, basally conical, subapically annulate, weakly sclerotized, apex enlarged (Fig. 7 E).
Etymology.
From the Greek eurus, ‘ wide’, and brakhíōn, ‘ arm’ in reference to the preanal appendage shape in lateral view.
Distribution.
Venezuela.
description: Published as part of Vilarino, Albane & Calor, Adolfo R., 2024, Comparative geometric morphometrics of male genitalia in Xiphocentron subgenera (Trichoptera: Xiphocentronidae): new species, revision and phylogenetic systematics of the subgenus Sphagocentron, pp. 407-431 in Arthropod Systematics & amp; Phylogeny 82 on pages 407-431, DOI: 10.3897/asp.82.e112587