Chimarra milneana, 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 milneana sp. nov.

Figures 41–43

Holotype. Male (specimen in alcohol, CT-390 figured), PNG, Milne Bay Province, Milne Bay, about 10° 22' S, 150° 30' E, 14–23 February 1969, J. and M. Sedlacek ( BPBM).

Diagnosis. The male of C. milneana aligns vaguely with the C. papuana group in possessing a filiform dorsoapical process on the inferior appendages but lacking an elongate ventral process on segment IX (after Mey, 2006) and is most similar to C. bobita Oláh, 2012 . Chimarra milneana can be separated from C. bobita and other members of the group by the relatively short ventral process on segment IX and the sharply and complexly angled ventral margin of the inferior appendages.

Description. General body colour and wings light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.3 mm. Forewing with forks 1, 2, 3 and 5 present, Rs moderately sinuous or curved, moderately thickened, basad of discoidal cell.

Male. Segment IX anterior margin in lateral view, with narrowly rounded extension ventrally (fig. 41); ventral process short, tapered and acute distally (fig. 42), almost reaching distal margin of segment IX (figs 41, 42), in lateral view length about 2.5 times width (fig. 41); preanal appendages sub-rectangular with rounded apices (figs 41, 43). Segment X mesal lobe with dorsally directed, dorso-ventrally flattened projection, lateral lobes elongate, laterally compressed distally, with sensilla not discerned (fig. 43), in lateral view lateral lobes appear robust, with slightly downturned apices (fig. 41), in dorsal view lateral lobes tapered near middle, appear very slender in distal half (fig. 43). Phallus with two slender spines included subapically (fig. 43). Inferior appendages robust in basal two thirds, narrowed in distal third, with dorso-subapical projection bearing three hairs apically, directed posteromesally (figs 41– 43), in lateral view inferior appendages angled at about 45° to horizontal, length about 1.6 times width, ventral margin angled at about 90° both near distal two thirds and distally (fig. 41), in ventral view mesal margin angled at about 90° distally, with projection on the mesal surface (fig. 42).

Female. Unknown.

Etymology. Milneana – named after the type locality (Milne Bay).

Remarks. Chimarra milneana is known only from the type locality in south-east PNG.

Figures

Figures 35–43. Chimarra spp.; 35–37, Chimarra trigona sp. nov., male, holotype, genitalia; 35, lateral; 36, ventral; 37, dorsal. 38–40, Chimarra harpes sp. nov., male, holotype, genitalia; 38, lateral; 39, ventral; 40, dorsal. 41–43, Chimarra milneana sp. nov., male, holotype, genitalia; 41, lateral; 42, ventral; 43, dorsal.