Chimarra pertica, 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 : 6

Chimarra pertica sp. nov.

Figures 1–3

Holotype. Male (dried, pinned specimen CT-357 figured), PNG (south-east Central Province ), Mamai Plantation, east of Port Glasgow, 150 m, about 10° 16' S, 149° 30' E, 27 January 1965, R. Straatman ( BPBM).

Diagnosis. The males of C. pertica , C. guentheri Mey and C. eltuna Oláh can be separated from other New Guinea species by the very slender, elongate ventral process on segment IX, reaching to at least midlength of inferior appendages. Chimarra pertica differs from C. guentheri and C. eltuna in that the ventral process is not dilated distally in lateral view and the inferior appendages, in lateral view, have the dorsal margin curved (slightly convex), not straight near the midlength.

Description. General body colour and wings light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.4 mm. Forewing with forks 1, 2, 3 and 5 present, Rs sinuous or curved, thickened basad of discoidal cell; hind wing with forks 1, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, with angular extension ventrally (fig. 1); ventral process a very elongate, slender, rod-like projection, reaching almost length of inferior appendages (figs 1, 2), length about 20 times width in lateral view (fig. 1); preanal appendages small, rounded apically (figs 1, 3). Segment X with pair of lateral lobes (figs 1, 3), broad basally in lateral view, tapered in distal half, slender apically (fig. 1), in dorsal view slender with slightly rounded and dilated apices (fig. 3). Phallus with one slender internal spine subapically (figs 1, 3). Inferior appendages robust, apices acute, slightly inflexed (figs 2, 3), in ventral view sub-quadrate (fig. 2), in lateral view angled at about 45° to horizontal, length about 3 times width, upturned distally (fig. 1), length in ventral and dorsal views about twice width (figs 2, 3).

Female. Unknown.

Etymology. Pertica – Latin for long pole or rod (elongate ventral process on segment IX).

Remarks. Chimarra pertica is known only from the holotype male from the type locality in south-east PNG.

Figures

Figures 1–7. Chimarra spp.; 1–3, Chimarra pertica sp. nov., male, holotype, genitalia; 1, lateral; 2, ventral; 3, dorsal. 4–6, Chimarra guentheri Mey, male, genitalia; 4, lateral; 5, ventral; 6, dorsal. 7, Chimarra ukarumpana sp. nov., male, holotype; 7, wings.