Chimarra newguineana, 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 : 21-23

Chimarra newguineana sp. nov.

Figures 63– 65 Holotype. Male (dried, pinned specimen CT-397 figured), PNG, Western Highlands Province, Mount Hagen , 1600–1700 m (about 5° 52' S, 144° 13' E), September 1971, N.H. Krauss ( BPBM) .

Paratype. Male (in alcohol, specimen CT-714), PNG, Eastern Highlands Province, Ukarumpa, Bai River (about 6° 34' S, 145° 88' E), lt tr, 22 June 1986, A. Wells ( NMV) .

Diagnosis. The males of C. newguineana are similar to those of C. aiyura Korboot and C. sedlaceki Sykora , but can be separated from these and all New Guinea species by the combination of the strongly developed spine-like apicoventral projection of the phallus (phallobase), the inferior appendages angled vertically, with irregularly serrate meso-ventral margin, and the lateral lobes of segment X with triangular flange in basal half and slightly out-turned apices.

Description. General body colour and wings fawn (faded) to light brown. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.2–5.8 mm. Forewing with forks 1, 2, 3 and 5 present, Rs slightly sinuous or curved, slightly to moderately thickened basad of discoidal cell; hind wing with forks 1, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, with broad rounded extension ventrally and minute extension dorsally; ventral process short, basal to distal margin of segment IX (figs 63, 64), in lateral view keel shaped, length about 1.2–1.3 times width; preanal appendages slightly laterally flattened, appear rounded in lateral view (fig. 63), in dorsal view, appear narrowly ovate (fig. 65). Segment X lateral lobes slightly laterally flattened with sensilla not discerned, broadest in basal half, tapered in distal half (figs 63, 65), in ventral and dorsal views lateral lobes with triangular flange in basal half (possibly with sensilla), apices appear slightly out turned (figs 64, 65). Phallus with two short, slender spines embedded subapically, with spine-like apicoventral projection (figs 63, 64). Inferior appendages slender, broadest in basal half with serrated ventromesal margin, tapered slightly in distal half, with acute apices directed dorsomesally (figs 63–65), in lateral view, angled at about 90° vertically, length about 3 times width at base, dorsal margin slightly concave in basal half and ventral margin slightly, irregularly convex in basal half and almost straight in distal half (fig. 63).

Female. Unknown.

Etymology. Newguineana – named for the locality (New Guinea Island).

Remarks. Chimarra newguineana is known from only two male specimens from the Western and Eastern Highlands of PNG.

Figures

Figures 60–69. Chimarra spp.; 60–62, Chimarra clava sp. nov., male, holotype, genitalia; 60, lateral; 61, ventral; 62, dorsal. 63–65, Chimarra newguineana sp. nov., male, holotype, genitalia; 63, lateral; 64, ventral; 65, dorsal. 66–69, Chimarra pindua sp. nov., male, holotype, 66–68, genitalia; 66, lateral; 67, ventral; 68, dorsal; 69, forewing.