Chimarra antap, 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 : 36-38

Chimarra antap sp. nov.

Figures 117–119

Holotype. Male (dried, pinned specimen PT-1482 figured), PNG, Southern Highlands Province, Mount Ialibu , 2660 m, about 6° 15' S, 144° 03' E, 8–18 Apr 1968, J.L. Gressitt ( BPBM).

Diagnosis. The male of C. antap can be separated from all other New Guinea species by the shape of the inferior appendages, which are sub-semicircular in lateral view, with dorsal margin almost straight and ventral margin irregularly convex, together with the plate-like, laterally flattened lateral lobes of segment X.

Description. General body colour and wings light brownish. Wings similar to those of C. ukarumpana (fig. 7), except forewing with discoidal cell apparently open. Length of forewing: male 6.5 mm. Forewing with forks 1, 2, 3 and 5 present, Rs slightly sinuous or curved, not thickened, basad of (open) discoidal cell; hind wing with forks 1, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, anteroventrally angular or truncate (fig. 117), ventral process short, basal to distal margin of segment IX (figs 117, 118), in lateral view, keel-like, length about half basal width, distal margin weakly rounded (fig. 117), in ventral view appears sub-triangular, apex acute (fig. 118), preanal appendages appear ovate in lateral view (fig. 117), rod-like in dorsal view (fig. 119). Segment X lateral lobes laterally compressed, aligned alongside phallus, sensilla not discerned (figs 117, 118), in lateral view appear robust, sub-rectangular (fig. 117), in dorsal view, plate-like (fig. 117). Phallus with two slender spines included near midlength. Inferior appendages broadest near midlength, tapered distally, apices directed posteromesally (figs 117–119), in lateral view angled at about 30° to horizontal, length about 2.3 times width, appears sub-semicircular, dorsal margin almost straight, ventral margin slightly convex (fig. 117), in ventral view lateral margins curved, mesal margin crenulate near midlength (fig. 118).

Female. Unknown.

Etymology. Antap – New Guinea Pidgin for summit (type locality near summit of Mount Ialibu).

Remarks. Chimarra antap is known from a relatively high-altitude locality in central PNG.

Figures

Figures 111–119. Chimarra spp.; 111–113, Chimarra lolakiana sp. nov., male, holotype, genitalia; 111, lateral; 112; ventral, 113, dorsal. 114–116, Chimarra verticas sp. nov., male, holotype, genitalia; 114, lateral; 115, ventral; 116, dorsal. 117–119, Chimarra antap sp. nov., male, holotype, genitalia; 117, lateral; 118, ventral; 119, dorsal.