Chimarra insolita, 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 : 6-8

Chimarra insolita sp. n.

( Figure 2 )

Diagnosis. We are unsure about the closest affinity of this species, which has a general similarity to a number of species in the tsudai Group. It is most readily diagnosed by the distinctive, angled apicomesal projection on the dorsal margin of each inferior appendage. This projection is also evident in lateral view. Description. Forewing length (male) 6.2 mm. Color (in alcohol) yellowish-brown. Head relatively elongate (postocular parietal sclerite extended behind eye). Mesoscutellar setal wart pear-shaped, with usual 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, slightly shorter than segment 5, 4 th segment short. Tarsi of males somewhat modified, tarsal claws moderately enlarged, asymmetric in length and curvature. Forewing with Rs strongly deflected (curved toward anal margin) and sinuously inflected before base of discal cell; veins at base of discal cell somewhat 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 widened dorsally, dorsal margin rounded, projecting, without distinct modifications, about twice length of sternum VIII. Segment IX unsclerotized dorsally, with distinct, short dorsolateral apodemes on anterior margin, 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 simple in structure, elongate, narrow, rounded apically, with numerous sensilla along dorsal, ventral, and apical margins; mesal lobes digitate, nearly uniform in width, apices acute, lobes strongly reclinate and posteriorly projecting, apices of lobes, as viewed dorsally, curved outward, each lobe with two small subapical sensilla. Preanal appendages short, rounded, somewhat constricted basally (knob-like). Inferior appendages relatively short, subquadrate, each with mesally curved process from posterodorsal margin; as viewed ventrally, with apicoventral margin rounded and dorsomesal process narrowing apically to form very distinct, acute, posteromesally angled process; extreme apex of process mesally incurved, resulting in apices of paired appendages being nearly proximate. Phallotheca moderate in length, tubular, with usual basal expansion. Endotheca short, membranous, apicomesally with moderately elongate, narrow spine-like projection, apparently formed of several closely apposed seta-like spines; apex also with pair of small, rounded, membranous lobes, each with numerous, minute, weakly-sclerotized spines. Phallotremal sclerite complex elongate, more than half length of phallotheca, formed of elongate curved rod and ring structure with paired lateral sclerites.

Material examined. Holotype male: VIETNAM: Ha Giang Province, 1210 m, 22 o 45.55’N, 104 o 50.02’E, 22 September 2000, aerial Malaise trap, C. Johnson ( AMNH) . Paratype: 1 male, Ha Giang Province, 1170 m, 22 o 46.15’N, 104 o 49.38’E, 7 September 2000, Black light/ MV lamp, C. Johnson, T.C. Nguyen, R. Hanner ( AMNH).

Etymology. This species is named for the unusually long, spine-like projection of the endotheca ( insolita is Latin for unusual or strange).

Figures

Figure 2. Chimarra insolita sp. n., male genitalia. A) Lateral; B) Dorsal; C) Ventral; D) Phallic apparatus, lateral; E) Phallic apparatus, dorsal.