Chimarra ismayi, 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 : 47

Chimarra ismayi sp. nov.

Figures 161 –163

Holotype. Male (figured specimen PT-1778), PNG, Oro Province, Myola 2, 2080 m, forest river, about 9° 05' S, 147° 42' E, 26 July 1986, J. W. Ismay ( NMV, T-22483).

Diagnosis. Chimarra ismayi can be separated from all other New Guinea species by the shape of the inferior appendages, which are short and robust with an acute, mesal, subapical process. Superficially the shape of the inferior appendages seems most similar to south-east Asian species such as C. concolor Ulmer and C. spinifera Kimmins.

Description. General body colour and wings fawn (faded). Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 5.1 mm. Forewing with forks 1, 2, 3 and 5 present, Rs slightly sinuous or curved, moderately thickened, basad of discoidal cell; hind wing with forks 1, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, anteroventrally weakly angled, distal margin broadly rounded (fig. 161), ventral process on segment IX, not obvious (figs 161, 162), preanal appendages in lateral view ovoid (fig. 161), in dorsal view appear irregular (fig. 163). Segment X mesal lobe damaged?, lateral lobes dorso-ventrally flattened in distal third, with sensilla not discerned (figs 161, 163), in lateral view, tapered distally (fig. 161). Phallus not discerned (or has been removed?; figs 161, 162). Inferior appendages short, robust with triangular, meso-subapical process (figs 161–163), in lateral view appear ovoid, aligned horizontally, length about 1.8 times width, broadest near midlength, dorsal and ventral margins convex, broadly rounded distally (fig. 161), in ventral and dorsal views, lateral margins slightly convex (figs 162, 163).

Female. Unknown.

Etymology. Ismayi – named for J.W. Ismay (collector).

Remarks. Chimarra ismayi is known from the holotype male specimen from south-east PNG. This specimen has probably been damaged slightly with the possible removal of the phallus?

Figures

Figures 155–161. Chimarra spp.; 155–157, Chimarra maai sp. nov., male, holotype, genitalia; 155, lateral; 156, ventral; 157, dorsal. 158–160, Chimarra supia sp. nov., male, holotype, genitalia; 158, lateral; 159, ventral; 160, dorsal. 161–163, Chimarra ismayi sp. nov., male, holotype, genitalia; 161, lateral; 162, ventral; 163, dorsal.