Chimarra ungula, 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 : 17-19

Chimarra ungula sp. n.

( Figure 7 )

Diagnosis. This species has an apparent close similarity to both C. thaiorum Chantaramongkol and Malicky and C. atnia Malicky and Chantaramongkol , especially in the elongate inferior appendages and the curvature of these in ventral view. It differs from either species in that the apices of the appendages are more strongly bent in their apical half, as viewed laterally, and in the very prominent basomesal protuberance of the appendages. Additionally, the lateral lobes of tergum X are much shorter and the mesal lobe of tergum X has a very distinctive Y-shaped apicomesal sclerite.

Description. Forewing length (male) 3.8 mm. Color (in alcohol) yellowish-brown. Head short (postocular parietal sclerite not elongate). Mesoscutellar setal wart pear-shaped, with usual anterior suture. Maxillary palps absent (broken off in specimen examined). Male with tarsi very narrow, tarsal claws very small, symmetrically curved (unmodified). Forewing with Rs not noticeably modified, veins at base of discal cell somewhat swollen; 1 st fork slightly proximal to s cross-vein; r-m and m cross-veins hyaline, s partially hyaline, s and r-m linearly aligned, m slightly 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 short, ventrally with short ventral process from posterior margin, process dorsoventrally flattened, acute in lateral view, subacute as viewed ventrally; tergum slightly widened dorsally, without distinct modifications. Segment IX sclerotized dorsally, dorsum very short, posterior margin concave as viewed dorsally; as viewed laterally, with dorsolateral apodemes on anterior margin only suggestively developed, anteroventral margin greatly, sinuously developed and projecting, extending almost to anterior of segment VII, mesal margin broadly truncate, as viewed dorsally or ventrally; posterior margin of segment nearly straight, with only slight angular projection below preanal appendages; ventral process emerging near middle of segment, very small, subtriangular, posteroventrally projecting. Tergum X with mesal lobe lightly sclerotized, continuous with posterior margin of segment IX, apex flared and divided mesally, forming Y-shaped apical sclerite; lateral lobes short and rounded, nearly converging ventrally below phallotheca, each lobe with 2 large prominent sensilla, 1 preapically and 1 on short rounded lobe on ventral margin. Preanal appendages very small and rounded, fused basally to base of tergum X. Inferior appendages very elongate; as viewed laterally, angled dorsally from base, very strongly posteriorly curved in apical half, apical part very narrow, curved-lanceolate in shape, tapering apically, apex acute; as viewed ventrally, very sinuously curved, bowed outward in basal half, converging in apical half, each appendage with prominent, projecting, subtruncate protuberance on mesal margin in basal half. Phallotheca moderately elongate, narrow, tubular, with usual basal expansion. Endotheca unexpanded in specimen examined, apparently granulate in texture, internally with 2 symmetrically paired, elongate spines, extending over half length of phallotheca. Phallotremal sclerite complex not clearly evident, apparently forming short, weakly sclerotized rod and ring structure, rod with small preapical sclerite.

Material examined. Holotype male: VIETNAM: Nghe An Province, W of Con Cuong, Moi Forestry Camp , 18 o 56’N, 104 o 49’E, 24-29 October 1994, D. Currie ( ROM 946105 ).

Khe

Etymology. This species is named for the claw-like shape of the inferior appendage ( ungula is Latin for claw).

Figures

Figure 7. Chimarra ungula sp. n., male genitalia. A) Lateral; B) Dorsal; C) Ventral; D) Phallic apparatus, lateral; E) Phallic apparatus, dorsal.