Chimarra rostrata, 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 : 10-12

Chimarra rostrata sp. n.

( Figure 4 )

Diagnosis. This species is perhaps most similar, in general features, to C. areli Malicky and Mey , especially in the general shape of the inferior appendages. In both species these are similar in length and have a distinct preapical indenture on the mesal margin, as viewed ventrally. Chimarra rostrata differs in having 2 short apicomesal spine-like projections on each of the inferior appendages, and also in the short armored mesal lobes of tergum X, as well as the distinctive, sclerotized, downturned ventral apex of the phallotheca.

Description. Forewing length (male) 5.8-6.2 mm. Color (in alcohol) dark brown. Head moderately elongate (postocular parietal sclerite somewhat extended behind eye). Mesoscutellar setal wart broadly pear-shaped, without apparent anterior suture. Maxillary palps with 1 st segment very short, 2 nd segment moderately elongate (shorter than segment 3, longer than segment 4), 3 rd segment relatively elongate, 4 th segment short, 5 th segment slightly shorter than segment 3. Tarsi of males modified, tarsal claws moderately to distinctly enlarged, asymmetric in length and curvature. Forewing with Rs deflected (curved toward anal margin) and sinuously inflected before base of discal cell; veins at base of discal cell slightly swollen, length of discal cell about 3 times width; r-m and m cross-veins hyaline (unpigmented), s not 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 narrowly separated, not fused.

Male genitalia: Segment VIII with sternum short, subtending ventral margin of segment IX; tergum scarcely longer than sternum, only slightly widened dorsally, without modifications. Segment IX unsclerotized dorsally, with distinct, short dorsolateral apodemes on anterior margin; as viewed laterally, with anterior margin extending nearly linearly from apodemes, curved in ventral half to form strongly projecting ventral margin, anteroventral margin strongly convexly rounded (as viewed dorsally or ventrally); segment very short dorsally (anterior and posterior margins narrowly separated), posterior margin abruptly, angularly lengthened below preanal appendages; ventral process very short, subtriangular, broad basally, ventrally projecting. Tergum X with lateral lobes moderately elongate (but much shorter than inferior appendages), dorsoventrally flattened, and relatively simple in structure; as viewed laterally, slightly curved downward at base, gradually narrowed and subacute apically; as viewed dorsally, elongate subtriangular, broadened near base and tapering apically, apices subacute; paired lobes relatively narrowly separated mesally, each lobe with numerous sensilla on lateral and ventral margins; mesal lobes of tergum X short and broad, complex in structure, ventral margins converging below phallotheca, dorsal margins flared outward, with 1-3 sclerotized, anteriorly curved spines on lateral margin, somewhat variably developed in different specimens and not always symmetrical on 2 lobes. Preanal appendages very short, rounded, somewhat flattened, fused basally to lateral margin of segment IX. Inferior appendages elongate, moderately dorsoventrally flattened, linear and slightly upturned as viewed laterally, with ventral margin slightly bulging; as viewed ventrally, relatively broad and uniform in width for basal three-fourths, very distinctly, angularly notched on mesal surface at apical one-fourth, apices more or less rounded, each with pair of very small, spine-like preapical projections. Phallotheca moderately elongate, tubular, with usual basal expansion, apicoventral margin sclerotized and projecting, distinctly downturned, extreme apex forming a subtriangular, laterally flattened (keeled) projection. Endotheca (apparently) only moderately elongate, mostly membranous and unmodified, but with small cluster of about 5-6 small spines. Phallotremal sclerite complex composed of pair of elongate, flattened, sclerotized rods, extending about half length of phallotheca.

Material examined. Holotype male: VIETNAM: Thua Thien-Hue Province, Bach Ma NP, near junction of Rhododendron and Five Lakes trails, 1200 m, 16 o 11.17’N, 107 o 50.92’E, 16 June 2000, B. Hubley, C. Darling ( ROM 2000531 ) . Paratypes: 28 males, same data as holotype ; 1 male, 2 females, Quang Nam Province, Ngoc Linh , 1460 m, 15 o 2’N, 108 o 2.3’E, 24 March 1999, sweep, D. Grimaldi, L. Herman, C. Johnson, K. Long, E. Sterling ( AMNH) .

Etymology. This species is named for the beak-like mesal lobes of tergum X ( rostrata is Latin for beaked).

Figures

Figure 4. Chimarra rostrata sp. n., male genitalia. A) Lateral; B) Dorsal; C) Ventral; D) Phallic apparatus, lateral; E) Phallic apparatus, dorsal.