Chimarra simbuensis, 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 : 46

Chimarra simbuensis sp. nov.

Figures 152–154

Holotype. Male (dried, pinned specimen CT-396 figured), PNG, Simbu (Chimbu) Province, ca north-west of Lake Piunde , 3600–3800 m, about 5° 47'S, 145° 04'E, 14–16 August 1969, J.L. Gressitt ( BPBM).

Paratype. PNG. Male (dried, pinned specimen CT-395), Simbu (Chimbu) Province, Mount Wilhelm , 3560+ m, 5°44'S, 145°04'E, 1–9 Aug 1969, J.L. Gressitt ( BPBM) .

Diagnosis. The males of C. simbuensis can be separated from all other New Guinea species, by the unique lateral protuberances on the phallus and the basi-ventral ‘flange’ on the inferior appendages. It shares with C. oláhi the character of ventral ‘flanges’ on the inferior appendages.

Description. General body colour and wings fawn to light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.6–5.8 mm. Forewing with forks 1, 2, 3 and 5 present, Rs straight, not sinuous or curved, not thickened, basad of discoidal cell.

Male. Segment IX anterior margin in lateral view, with rounded extension ventrally (fig. 152), ventral process on segment IX, in lateral view very weakly keel-like, length about 0.2 times basal width, preanal appendages, rounded in lateral view (fig. 152), in dorsal view appear sub-triangular (fig. 154). Segment X lateral lobes laterad of phallus, sensilla not discerned (figs 152, 154), in lateral view robust (fig. 152), in ventral view slender in distal third (fig. 153). Phallus with no obvious included spines but with pair of triangular, lateral protuberances or fins subapically (figs 153, 154). Inferior appendages broadest in basal half, with a flange baso-ventrally, tapered gradually distally, apices acute, directed posteromesally (figs 152, 153), in lateral view aligned horizontally, robust, length about 1.9 times width, appear subovoid, dorsal margin slightly concave, ventral margin slightly convex in basal half, apices broadly rounded (fig. 152), in ventral view lateral margins curved (fig. 153).

Female. Unknown.

Etymology. Simbuensis – named for the type locality (Simbu Province of PNG).

Remarks. Chimarra simbuensis is known from two male specimens from two very high-altitude localities in central PNG.

Figures

Figures 146–154. Chimarra spp.; 146–148, Chimarra lindyae sp. nov., male, holotype, genitalia; 146, lateral; 147, ventral; 148, dorsal. 149–151, Chimarra kebarana sp. nov., male, holotype, genitalia; 149, lateral; 150, ventral; 151, dorsal. 152–154, Chimarra simbuensis sp. nov., male, holotype, genitalia; 152, lateral; 153, ventral; 154, dorsal.