Chimarra bifida, 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 : 27-28

Chimarra bifida sp. nov.

Figures 83–85

Holotype. Male (dried, pinned specimen CT-384 figured), Indonesia, Papua Province, W Sentani, 75 m, about 2° 36' S, 140° 37'E, June 1959, T.C. Maa ( BPBM).

Paratypes. 1 male (dried, pinned specimen CT-385), Indonesia, Papua Province, collected with holotype ( BPBM) ; 1 male (in alcohol, specimen CT-710), PNG, Western Highlands, Baiyer River Sanctuary, Trauna River , 5 35' S, 144 10' E, UV light, 17 June 1985, A. Wells ( NMV) .

Diagnosis. The males of C. bifida are similar to C. kokodana and C. bicuspidis in the bifid apices on the inferior appendages but can be separated from the latter two and all other New Guinea species, including C. sinuosa , by the combination of features on the inferior appendages, which in lateral view are sinusoidal with bifid apices.

Description. Male. General body colour and wings light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.5–4.7 mm. Forewing with forks 1, 2, 3 and 5 present, Rs straight, not sinuous or curved, slightly thickened, basad of discoidal cell.

Male genitalia. Segment IX anterior margin in lateral view, anteroventrally rounded (fig. 83), ventral process short, triangular, apex acute, basal to distal margin of segment IX (figs 83, 84), in lateral view, length about 0.7–0.8 times width, preanal appendages small, ovate (fig. 83). Segment X lateral lobes laterally compressed in basal half, apices narrowly rounded, with sensilla not discerned (figs 83–85), in lateral view, lobes broadest in basal half, narrowed strongly near middle, slender in distal third (fig. 83), in dorsal and ventral views mostly adpressed to phallus (figs 84, 85). Phallus without any spines discerned. Inferior appendages broadest in basal half, tapered slightly distally, apices bifid, directed posteromesally (figs 83–85), in lateral view, angled near perpendicularly, sinusoidal, dorsal margin convex, ventral margin convex in basal half, concave in distal half (fig. 83).

Female. Unknown.

Etymology. Bifida – Latin for forked, split, divided into two parts (apices of inferior appendages).

Remarks. Chimarra bifida is known from three males collected from both north-east West Papua and central PNG. The two sites are separated by about 530 km in a straight line.

Figures

Figures 78–85.Chimarra spp.; 78–79, Chimarra aiyura Korboot, male, genitalia; 78, lateral; 79, dorsal. 80–82, Chimarra bicuspidis sp. nov., male, holotype, genitalia; 80, lateral; 81, ventral; 82, dorsal. 83–85, Chimarra bifida sp. nov., male, holotype, genitalia; 83, lateral; 84, ventral; 85, dorsal.