Chimarra kebarana, 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 kebarana sp. nov.

Figures 149–151

Holotype. Male (dried, pinned specimen CT-379 figured), Indonesia, Papua Province, Vogelkop, Kebar Valley , W of Manokwari, 550 m, about 0° 52' S, 134° 05' E, 4–31 January 1962, S. and L. Quate ( BPBM).

Paratype. Indonesia. Male (dried, pinned specimen CT-380), Papua Province, Oransbari, south of Manokwari , 3 m, about 1° 21' S, 134° 16' E, 12 February 1963, R. Straatman ( BPBM) .

Diagnosis. The males of C. kebarana can be separated from all other New Guinea species, in particular C. oláhi , C. aiyura Korboot and C. falcata Kimmins , by the combination of the shape of the lateral lobes of segment X, which are situated laterad of and below the phallus and appear as a pair of slender processes ventral to the phallus, which diverge subapically and the short, sub-triangular inferior appendages, in lateral view.

Description. General body colour and wings light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 5.4–5.7 mm. Forewing with forks 1, 2, 3 and 5 present, Rs slightly sinuous or curved, slightly thickened, basad of discoidal cell.

Male. Segment VIII with acute ventral process. Segment IX anterior margin in lateral view, anteroventrally narrowly rounded (fig. 149), ventral process on segment IX, in lateral view, very weakly keel-like, length about 0.2 times basal width, preanal appendages, in lateral view rounded, narrowed basally (fig. 149), in dorsal view appear sub-triangular (fig. 151). Segment X lateral lobes laterad of and ventral to the phallus (hard to discern), sensilla not discerned (figs 149, 151), in lateral view apices appear acute (fig. 149), in ventral view lateral lobes appear as pair of slender processes, apices acute, directed slightly outwardly (fig. 150). Phallus with two slender, subapical internal spines (figs 149–151). Inferior appendages broadest in basal half, tapered gradually distally, apices acute, directed posteromesally (figs 149, 150), in lateral view angled at about 45° to horizontal, length about 2.3 times width, appear sub-triangular, dorsal margin mostly straight, ventral margin right angled in basal third, sub-truncate distally (fig. 149), in ventral and dorsal views lateral margins curved (figs 150, 151).

Female. Unknown.

Etymology. Kebarana – named for the type locality (Kebar Valley of Indonesian Papua).

Remarks. Chimarra kebarana is known only from two male specimens from north-east Papua.

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.