Chimarra mina, 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 : 8-10

Chimarra mina sp. n.

( Figure 3 )

Diagnosis. Chimarra mina belongs to a subgroup of species in the tsudai Group characterized by having a distinctive lateral brush of very elongate setae on the inferior appendages. The subgroup includes C. crepidata Kimmins , C. haimuoi Malicky , C. lahuorum Chantaramongkol and Malicky , C. oreithyia Malicky , C. pontus Malicky , C. scopulifera Kimmins , C. semiramis Malicky , and C. suthepensis Chantaramongkol and Malicky. Species differ in details of the shape of the inferior appendages, especially the position and shape of the apicomesal projections, the shape of the lateral lobes of tergum X, and in the armature of the phallic apparatus. Distinctive characters of C. mina include apicomesal projections on the inferior appendages that are relatively narrow basally (and thus more distinctly awl-like than some others in this group), a short tergum X with a basolateral bulge, and endothecal spines that include a pair of clustered spines.

Description. Forewing length (male) 6.0 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 elongate, subequal to segment 5, 4 th segment short. Tarsi of males distinctly modified, tarsal claws enlarged and sinuous, 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 somewhat swollen, length of discal cell about 3 times width; r-m and m cross-veins hyaline (unpigmented), s not or only slightly 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, ventral margin with very short posteroventral process, process broadly rounded as viewed ventrally, posterior margin of sternum with staggered row of moderately elongate setae on either side of ventral process; tergum slightly widened dorsally, without distinct modifications. Segment IX unsclerotized dorsally, with dorsolateral apodemes minute, scarcely developed; as viewed laterally, with anterior margin extending linearly from apodemes, curved in ventral half to form projecting ventral margin, anteroventral margin subtruncate mesally (as viewed dorsally or ventrally); segment short dorsally (anterior and posterior margins narrowly separated), abruptly, angularly lengthened on posterior margin below preanal appendages and additionally lengthened below inferior appendages; ventral process absent; ventrolateral margins of segment with brush of moderately elongate setae, as apparent extension of lateral brush of inferior appendages, brush extending half or more length of segment, mesal surface of segment (between brushes) very scabrously developed. Segment X with lateral lobes moderately elongate (shorter than inferior appendages); each lobe, as viewed laterally, with broadly rounded dorsal bulge near middle and apparent lateral bulge near base, apex of lobe broadly rounded; as viewed dorsally, with distinct, densely sensillate, basolateral bulge, apex of lobe digitate, rounded apically, apices of opposite lobes slightly converging; sensilla numerous on apical and lateral margins of lobes, very dense on basolateral bulges; mesal lobes of tergum X more or less upright, somewhat posteriorly directed, each lobe moderately broad basally, narrowed apically, extreme apex with small anteriorly hooked spine, each lobe (apparently) with 2 minute sensilla, located preapically on dorsal and ventral margins. Preanal appendages very small, rounded, fused basally to lateral margin of segment IX. Inferior appendages moderately elongate, linear; as viewed laterally, wide at base and narrowed apically, apex subtruncate, ventral margin of apex rounded, dorsal margin with acute angle (apicomesal projection), lateral margin of each appendage with brush of very elongate, posteriorly directed setae, not quite extending to apex; as viewed ventrally, with lateral margins broadly rounded, apices subtruncate, each with distinct, sclerotized, flattened apicomesal projection on mesal surface, projection relatively narrow basally, very distinctly acute as viewed ventrally, ventral surface of appendages without setae, except for distinctly demarcated lateral brush. Phallotheca moderately elongate, tubular, with usual basal expansion, apex with distinct rounded lateral expansions (possibly sclerotized base of endotheca) and also slight ventral expansion. Endotheca with 2 short, narrow, distinctly sclerotized spines and also paired clusters of shorter, sclerotized spines (about 4-6, varying in length), endothecal membrane unexpanded in specimen examined, but apparently moderately elongate and textured with minute spines. Phallotremal sclerite complex composed of short rod and ring structure, rod with small sclerite near apex.

Material examined. Holotype male: VIETNAM: Ha Tinh Province, Huong Son , 900 m, 18 o 21’N, 105 o 15’E, 15 May 1998, Malaise trap, J. Carpenter, D. Grimaldi, L. Herman, K. Long, D. Silva ( AMNH).

Etymology. This species is named for the non-hairy ventral surface of the inferior appendage ( mina is Latin for hairless).

Figures

Figure 3. Chimarra mina sp. n., male genitalia. A) Lateral; B) Dorsal; C) Ventral; D) Phallic apparatus, lateral; E) Phallic apparatus, dorsal.