Chimarra kewabi, 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 : 28-30

Chimarra kewabi sp. nov.

Figures 87–89

Holotype. Male (dried, pinned specimen CT-405 figured), PNG, Southern Highlands District, Mount Ialibu , 2650 m?, about 6° 15' S, 144° 03' E, 8–14 September 1968, J.L. Gressitt ( BPBM).

Diagnosis. The male of C. kewabi can be separated from all other New Guinea species, including C. sinuosa and C. falcata , by the combination of characters that include the lateral lobes of segment X, which are dorso-ventrally flattened in the distal half in lateral view, with two small projections (sensilla?) subapically (like C. sinuosa ), but in dorsal and ventral views, they are dilated in the distal half and the inferior appendages are slender, inflexed apically, almost positioned perpendicularly and tapered gradually distally, in lateral view.

Description. General body colour and wings light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 6.8 mm. Forewing with forks 1, 2, 3 and 5 present, Rs slightly 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 (fig. 87), ventral process short, sub-triangular, apex acute, apex nearly level with distal margin of segment IX (figs 87, 88), in lateral view, length about 0.7 width, preanal appendages slightly laterally flattened, in lateral view, rounded (fig. 87), in dorsal view, appear rod-shaped (fig. 89). Segment X lateral lobes slightly dorso-ventrally flattened in distal half, apices slightly outwardly angled, in lateral view, broadest in basal half, tapered in distal half, with two subapical projections (sensilla?; fig. 87), in dorsal and ventral views, lobes robust, slightly dilated with curved margins in distal half (figs 88, 89). Phallus with one short, slender spine embedded subapically (figs 87, 89). Inferior appendages broadest in basal half, tapered distally, apices acute and directed posteromesally (figs 87–89), in lateral view, angled nearly vertically at about 80° to horizontal, length about 4 times width at base, dorsal and ventral margins mostly straight (fig. 87), in dorsal view, mesal and lateral margins angled near midlength (fig. 89).

Female. Unknown.

Etymology. Kewabi – named for the native PNG language spoken in the area near the type locality.

Remarks. Chimarra kewabi is known from the type locality in central PNG.

Figures

Figures 86–93. Chimarra spp.; 86, Chimarra biramosa Kimmins, male, genitalia, lateral. 87–89, Chimarra kewabi sp. nov., male, holotype, genitalia; 87, lateral; 88, ventral, 89, dorsal. 90: Chimarra ulmeri Kimmins, male, genitalia, lateral. 91–93, Chimarra bicornis sp. nov., male, holotype, genitalia; 91, lateral; 92, ventral; 93, dorsal.