Chimarra denticulata, 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 : 42-44

Chimarra denticulata sp. nov.

Figures 140–142

Holotype. Male (dried, pinned specimen PT-1393 figured), PNG, Morobe Province, near Wau, Mount Missim , 1600 m, 7° 20' S, 146° 43' E, Malaise trap, 25 April 1966, J.L. Gressitt and O.R. Wilkes ( BPBM).

Diagnosis. The male of Chimarra denticulata can be separated from other New Guinea species, particularly C. missim , by the shape of the inferior appendages, which have two prominent teeth on the mesal margin in ventral view and the broad, keel shaped ventral process on segment IX.

Description. General body colour and wings light brownish. Wings similar to those of C. ukarumpana (fig. 7), length of forewing: male 4.6 mm. Forewing with forks 1, 2, 3 and 5 present, Rs sinuous or curved, thickened, basad of discoidal cell.

Male. Segment IX anterior margin in lateral view, anteroventrally rounded (fig. 140), ventral process in lateral view broad, weakly keel-like, length about 0.2 times basal width (fig. 140). Preanal appendages, in lateral view ovate (fig. 140), in dorsal view appear rounded (fig. 142). Segment X lateral lobes laterad and ventral to phallus, with sensilla not discerned (figs 140, 142), in lateral view appear tapered distally (fig. 140), in ventral view lobes appear tongue-shaped (fig.141). Phallus with two elongate, slender spines included subapically (figs 140–142). Inferior appendages broadest in basal half, tapered in distal half, apices directed posteriorly, acute (figs 140, 141), in lateral view angled at about 30° to horizontal, length about 4.5 times width with dorsal margin nearly straight, ventral margin with angular projection present near midlength (fig. 140), in ventral view lateral margins slightly curved, mesal margins curved with two prominent teeth near midlength (figs 141, 142).

Female. Unknown.

Etymology. Denticulata – Latin for finely toothed, serrated (two teeth on inner margin of inferior appendages).

Remarks. Chimarra denticulata is known from the type locality in north-east PNG.

Figures

Figures 137–145. Chimarra spp.; 137–139, Chimarra missim sp. nov., male, holotype, genitalia; 137, lateral; 138, ventral; 139, dorsal. 140–142, Chimarra denticulata sp. nov., male, holotype, genitalia; 140, lateral; 141, ventral; 142, dorsal. 143–145, Chimarra sepikana, male, holotype, genitalia; 143, lateral; 144, ventral; 145, dorsal.