Chimarra damma, Cartwright, 2020

Cartwright, David, 2020, A review of the New Guinea species of Chimarra Stephens (Trichoptera: Philopotamidae), Memoirs of Museum Victoria 79, pp. 1-49 : 25

Chimarra damma sp. nov.

Figures 75–77

Holotype. Male (dried, pinned specimen CT-409 figured), PNG, New Britain, Gazelle Peninsula, Gaulim , 140 m, about 4° 44' S, 152° 08' E, Malaise Trap, 21–27 October 1962, J. Sedlacek ( BPBM).

Diagnosis. The male of C. damma can be separated from all other New Guinea species, including the somewhat superficially similar C. kebarana , by the combination of the bifid apices on the plate-like lateral lobes of segment X and the short inferior appendages, with the ventral margin slightly curved in lateral view.

Description. General body colour and wings fawn or light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.6 mm. Forewings with forks 1, 2, 3 and 5 present, Rs moderately sinuous or curved, thickened, basad to discoidal cell.

Male. Segment IX anterior margin in lateral view, with weak angular extension ventrally (fig. 75), ventral process short, basal to distal margin of segment IX (figs 75, 76), in lateral view triangular, length about same as width, preanal appendages, relatively large, in lateral view ovate with rounded apices (fig. 75). Segment X lateral lobes appear rod-like but are plate-like laterad of phallus, apices bifid, situated ventral to phallus, sensilla not discerned (figs 75–77). Phallus (with endotheca possibly not fully everted) with two slender spines included subapically and small field of short spines appear apically (figs 75–77). Inferior appendages short, broadest basally, tapered slightly distally, strongly incurved in about apical third, apices acute (figs 75, 76), in lateral view appear sub-ovate, angled at about 60° to horizontal, length about 3 times width, dorsal margin almost straight and ventral margin slightly convex (fig. 75), in ventral view obtusely angled on basomesal margin, mesal and lateral margins curved meso-distally (fig. 76).

Female. Unknown.

Etymology. Damma – Latin for gazelle or deer (type locality – Gazelle Peninsula).

Remarks. Chimarra damma is known from one locality on north-east New Britain Island, PNG.

Figures

Figures 70–77.Chimarra spp.; 70–71, Chimarra sedlaceki Sykora, male, genitalia; 70, lateral; 71, dorsal. 72–74, Chimarra morobensis sp. nov., male, holotype, genitalia; 72, lateral; 73, ventral; 74, dorsal. 75–77, Chimarra damma sp. nov., male, holotype, genitalia; 75, lateral; 76, ventral; 77, dorsal.