Chimarra corneola, 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 : 19-21

Chimarra corneola sp. n.

( Figure 8 )

Diagnosis. Among described species, Chimarra corneola is perhaps most similar to C. georgensis , sharing a number of similarities, including, especially, the divided, spine-like lateral lobes of tergum X; and, the shape of the phallotheca, which is very short and has its apex strongly deflexed, with a pair of spine-like apical projections. However, it differs in the details of the shape of the lateral lobes and inferior appendages. The minutely spined ventral division of the lateral lobe of tergum X is especially distinctive.

Description. Forewing length (male) 4.6-5.2 mm, (female) 5.1-5.4 mm. Color (in alcohol) medium brown. Head short (postocular parietal sclerite not elongate). Mesoscutellar setal wart pear-shaped, with usual anterior suture. Maxillary palps with 1 st segment very short (about as long as wide), 2 nd segment short (length about 2 times width), 4 th segment subequal to 2 nd, 3 rd segment very long (about 3 times length of segment 2), 5 th segment subequal to or longer than segment 3. Tarsi of male very narrow, tarsal claws very small, symmetrically curved (unmodified). Forewing with Rs weakly inflected (curved toward costal margin), veins at base of discal cell distinctly swollen; 1 st fork nearly sessile or slightly proximal to s cross-vein; s, r-m, and m cross-veins hyaline (unpigmented) and linearly aligned; 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 short ventrally, slightly longer dorsally; tergum gradually lengthened dorsally, dorsal margin projecting mesally, about 3-4 times length of sternum at ventral margin, without distinct modifications. Segment IX short throughout; dorsal margin sclerotized, concave mesally, forming sclerotized ridge, continuous with anterolateral margin of segment; as viewed laterally, without distinct dorsolateral apodemes, anterior margin undulate (not expanded ventrally), posterior margin with subangulate projection below preanal appendages; ventral margin very short, with short, subacute, posteriorly-oriented ventral process; dorsal margin with paired, digitate projections from posterior margin, these fused basally with basomesal margins of preanal appendages, processes (as viewed dorsally) converging mesally, apices acute and curved outward. Tergum X with mesal lobe membranous, very short, scarcely evident; lateral lobes strongly sclerotized, short, divided into complex, spined structure, these fused on either side to sclerotized lateral wings of phallocrypt, lobes dorsomesally forming a pair of short, scabrous spines, ventrolaterally forming outward curved, sclerotized process with numerous short spines, each process with basoventral digitate projection, projection with single apical sensillum. Preanal appendages short, rounded, dorsoventrally flattened, each partially fused mesally with projecting dorsal process of tergum IX and ventrolateral lobe of tergum X. Inferior appendages short, more or less ovate, but with apical margins very irregular due to stout, projecting marginal setae; as viewed ventrally with basomesal margins subparallel, apices irregular; mesal surface (sparsely) with stiff erect setae. Phallotheca very short, fused to and securely anchored by sclerotized lateral wings of phallocrypt, basal expansion only weakly developed; ventral apex very strongly ventrally curved, almost from base of phallotheca, apex, as viewed ventrally, forming pair of sclerotized spines. Endotheca weakly sclerotized in basal part, ventrally with pair of symmetrical, short, recurved spines. Phallotremal sclerite complex difficult to interpret; as interpreted here, composed of relatively short rod and ring structure with associated, very prominent dorsomesal spine-like structure, spine recurved near apex, bordered basolaterally by short, curved sclerites (paired basal sclerites lyre-shaped, as viewed dorsally).

Material examined. Holotype male: VIETNAM: Gia Lai Province, An Khe District, 10 km NW Buoebloy, Cha River, on road to Tram Lap , 27 June 1996, UV light, D. Currie ( ROM 961098 ) . Paratypes: 1 female, same data as holotype ; 7 males, 11 females, Gia Lai Province, An Khe District, Tram Lap, Azun River , 2 km NW on trail from forestry building, 14 o 27’N, 108 o 33’E, 17 June 1996, D. Currie, J. Swann ( ROM 961056 ) ; 48 males, 55 females, ibid., 23 June 1996 ( ROM 961084 ) ; 2 males, 1 female, ibid., 3 km NE forestry building, 21 June 1996 ( ROM 961076 ) .

Etymology. This species is named for the several hornlike projections of the genitalia (cornu is Latin for horn).

Figures

Figure 8. Chimarra corneola sp. n., male genitalia. A) Lateral (inset – paratype); B) Dorsal; C) Ventral; D) Phallic apparatus, lateral; E) Phallic apparatus, dorsal; F) Phallic apparatus, ventral.