Chimarra prominens, Blahnik & Arefina-Armitage & J, 2012

Blahnik, Roger J., Arefina-Armitage, I. & J, Brian, 2012, The Genus Chimarra Stephens (Trichoptera: Philopotamidae) in Vietnam, Insecta Mundi 2012 (229), pp. 1-25 : 16-17

Chimarra prominens sp. n.

( Figure 6 )

Diagnosis. This species is probably most like C. haimuoihai Malicky. Both species have rather similar shaped inferior appendages, more or less linear, as viewed laterally, and with a transverse ridge on the mesal surface. Also, both species have a tergum X with short lateral lobes, each of which has a projecting ventral lobe with 2 prominent sensilla. Chimarra prominens differs significantly in having a relatively unmodified tergum VIII and in having 2 pairs of elongate spines in the phallic apparatus.

Description. Forewing length (male) 3.9 mm. Color (in alcohol) pale yellowish-brown, appendages yellowish-white. Head short (postocular parietal sclerite short). Mesoscutellar setal wart pear-shaped, with usual short anterior suture. Maxillary palps with 1 st segment very short (hardly longer than wide), 2 nd segment relatively short (slightly longer than segment 4), 3 rd segment elongate (nearly 2 times length of segment 4), 5 th segment slightly longer than segment 3. Male with tarsi very narrow, tarsal claws very small, symmetrically curved (unmodified). Forewing with Rs not or scarcely curved, discal cell relatively short (length about 2 times width), veins at base of discal cell distinctly swollen; s, r-m and m cross-veins hyaline, s and r-m linearly aligned, m distinctly proximal, anal veins without apical fork (2A and 3A both apparently looped to 1A). Hind wing with Sc and R

1

fused.

Male genitalia: Segment VIII with sternum very narrow ventrally, subtending ventral margin of segment IX, posteroventral margin with short, dorsoventrally flattened process, apex of process acute in both lateral and ventral views; tergum slightly widening dorsally, posteromesal margin depressed, with deep V-shaped emargination, extending almost to anterior margin, otherwise unmodified. Segment IX sclerotized dorsally; as viewed dorsally, with posteromesal margin concave, with small, anteriorly curved, tab-like mesal sclerite; as viewed laterally, with short, broadly rounded dorsolateral apodemes on anterior margin, anterior margin concavely rounded, ventral margin moderately produced, weakly emarginate mesally, as viewed dorsally or ventrally; segment moderately elongate dorsally, length more or less uniform extending to ventral projection; posterior margin weakly angulate at preanal appendages, narrowing below inferior appendages; ventral process very short, subtriangular, posteriorly-directed. Tergum X with mesal lobe short, membranous; lateral lobes sclerotized, very short, dorsal margins strongly sloped, ventral margin of each lobe with projecting, cupped lobe with 2 prominent sensilla near ventral margin, lobes from opposite sides converging mesally below phallic apparatus. Preanal appendages short, rounded, slightly narrowing basally (knob-like), emerging intersegmentally between terga IX and X. Inferior appendages moderately elongate, linear, narrowed basally and apically, apex forming small, acute, mesally directed, tooth-like projection; as viewed ventrally, with lateral margins gradually curved, mesal margins subparallel for more than half length, abruptly diverging and narrowing apically; mesal margin with conspicuous sclerotized transverse ridge at inflection point. Phallotheca moderately elongate, broadly tubular with usual basal expansion; apicoventral margin forming projecting apical sclerite; sclerite, as viewed laterally, with apex rounded and covered with minute microtrichia, as viewed ventrally with apex strongly compressed and keel-like. Endotheca membranous (not textured); phallic apparatus, internally, with 2 pairs of elongate, symmetrically positioned spines, ventral pair robust, somewhat dorsally curved, apices slightly diverging, dorsal pair much narrower, needle-like, nearly straight except apices distinctly ventrally curved. Dorsal pair of spines possibly part of modified phallotremal sclerite complex, phallotremal sclerite structure otherwise difficult to discern or interpret.

Material examined. Holotype male: VIETNAM: Ha Tinh Province, Huong Son , 200-300 m, 18 o 21’N, 105 o 15’E, 5 May 1998, sweep, J. Carpenter, D. Grimaldi, L. Herman, K. Long, D. Silva ( AMNH).

Etymology. This species is named for the apicoventral projection of the phallotheca ( prominens is Latin for jutting out or prominent).

Figures

Figure 6. Chimarra prominens sp. n., male genitalia. A) Lateral; B) Dorsal; C) Ventral; D) Phallic apparatus, lateral; E) Phallic apparatus, dorsal.