Chimarra bicuspidis, 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 : 27

Chimarra bicuspidis sp. nov.

Figures 80–82

Holotype. Male (specimen in alcohol, CT-349, figured), PNG, Central Province, Aieme River, about 9° 25' S, 147° 15' E, net, 23 June 1986, A. Wells ( NMV, T-22458).

Diagnosis. The male of C. bicuspidis is similar to C. bifida and C. kokodana Kimmins in the bifid apices on the inferior appendages, but can be separated from the latter two and all other New Guinea species by the combination of the inferior appendages being relatively straight, angled at about 70° to horizontal in lateral view and with bifid apices.

Description. General body colour and wings pale (faded). Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.5 mm. Forewing with forks 1, 2, 3 and 5 present, Rs not sinuous or curved, slightly thickened, basad of discoidal cell; hind wing with forks 1, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, anteroventrally broadly rounded, ventral process short, basal to distal margin of segment IX, in lateral view, appears triangular, apex acute, length about 0.8 times basal width (fig. 80), in ventral view appears rounded apically (fig. 81), preanal appendages ovate (figs 81, 82). Segment X with lateral lobes (difficult to discern) relatively long, laterally compressed, aligned laterally and mostly adpressed to phallus, apices acute, sensilla not discerned (figs 80, 82), in lateral view, lateral lobes appear ovate (fig. 80), in dorsal and ventral views, appear slender, dilated or flanged subapically (figs 81, 82). Phallus without any included spines discerned, but with robust ventral projection (or acute ventromesal projection of the phallobase?) subapically (figs 80, 81). Inferior appendages slender, broadest in basal third, tapered slightly in distal two thirds, apices bifid and directed posteromesally (figs 80, 82), in lateral view, angled at about 70° to horizontal, length about 4.5 times width, dorsal margin slightly concave, ventral margin mostly straight (fig. 80), in dorsal view, mesal and lateral margins curved (fig. 82).

Female. Unknown.

Etymology. Bicuspidis – Latin for two points (of a spear; apices of inferior appendages).

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

Figures

Figures 78–85.Chimarra spp.; 78–79, Chimarra aiyura Korboot, male, genitalia; 78, lateral; 79, dorsal. 80–82, Chimarra bicuspidis sp. nov., male, holotype, genitalia; 80, lateral; 81, ventral; 82, dorsal. 83–85, Chimarra bifida sp. nov., male, holotype, genitalia; 83, lateral; 84, ventral; 85, dorsal.