Chimarra kuka, 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 : 16

Chimarra kuka sp. nov.

Figures 44–46

Holotype. Male (dried, pinned specimen CT-375 figured), PNG, Eastern Highlands Province, Kassam , 1350 m, about 6° 18' S, 146° 15' E, sweeping, 28 October 1959, T.C. Maa ( BPBM).

Diagnosis. The male of C. kuka can be separated from all other New Guinea species in having distinctive slender, pincer-like inferior appendages. Superficially, the inferior appendages are similar to the pincer-like ones of C. atnia Malicky and Chantaramongkol from Peninsula Malaysia and Thailand; however, other features of the genitalia such as the shape of the lateral lobes of segment X and ventral processes on segments VIII and IX and phallic structure differ slightly.

Description. General body colour and wings fawn. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 5.4 mm. Forewing with forks 1, 2, 3 and 5 present, Rs sinuous or curved, thickened, basad of discoidal cell.

Male. Segment IX anterior margin in lateral view, without extension ventrally (fig. 44); ventral process short, sharply triangular in ventral view, arising close to base, apex well short of distal margin of segment IX (figs 44, 45), in lateral view length about 2.3 times width (fig. 44); preanal appendages sub-ovate, rounded apically (fig. 44). Segment X lateral lobes slightly laterally compressed (left lobe damaged distally), robust in basal half tapered slightly distally to narrowly rounded apices, sensilla not discerned (figs 44–46), in dorsal and ventral views lobes with apices slightly out turned (figs 45, 46). Phallus without any discernible spines. Inferior appendages broadest basally, tapered and slightly dorso-ventrally flattened distally, with apices acute, directed slightly posteromesally (figs 44–46), in lateral view angled at about 45° to horizontal, length about 4 times width at base, very slender in distal half (fig. 44).

Female. Unknown.

Etymology. Kuka – New Guinea Pidgin for pincers (inferior appendages).

Remarks. Chimarra kuka is known only from the holotype male from central PNG.

Figures

Figures 44–52. Chimarra spp.; 44–46, Chimarra kuka sp. nov., male, holotype, genitalia; 44, lateral; 45, ventral; 46, dorsal. 47–49, Chimarra absida sp. nov., male, holotype, genitalia; 47, lateral; 48, ventral; 49, dorsal. 50–52, Chimarra oláhi sp. nov., male, holotype, genitalia; 50, lateral; 51, ventral; 52, dorsal.