Chimarra cristata, 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 : 12

Chimarra cristata sp. nov.

Figures 26–28

Holotype. Male (dried, pinned specimen, CT-353 figured), PNG, Eastern Highlands Province, Karimui, south of Goroka , 1000 m, about 6° 32' S, 144° 47' E, lt tr, 5 June 1961, J.L. Gressitt ( BPBM).

Paratype. PNG. 1 male (dried, pinned specimen CT-372), Eastern Highlands Province, Kassam, 48 km east of Kainantu , 1350 m, about 6° 18' S, 145° 52' E, 7 November 1959, T.C. Maa ( BPBM) .

Diagnosis. The males of C. cristata can be separated from all other New Guinea species by the combination of having the inferior appendages with acute apices bearing a distinctive tuft of two or three elongate setae, and the ventral process on segment IX slightly angled near midlength, in lateral view.

Description. General body colour and wings fawn. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.2–4.3 mm. Forewing with forks 1, 2, 3 and 5 present, Rs moderately sinuous or curved, thickened basad of discoidal cell; hind wing with forks 1?, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, with angular extension ventrally (fig. 26); ventral process in form of short slender projection with apex almost level with distal margin of segment IX (figs 26, 27), in lateral view length about 3 times width, slightly bent near middle (fig. 26), in ventral view slightly tapered distally (fig. 27); preanal appendages small, rounded apically (figs 26, 28). Segment X with sensilla not obvious, lateral lobes stout, tapered to pointed apices (figs 26, 28). Phallus with two slender spines embedded subapically (fig. 26, 27). Inferior appendages robust, tapered in distal quarter with acute, inflexed apices, bearing tuft of two or three elongate setae (figs 26–28), in lateral view, angled at about 45° to horizontal, length about 3.2 times width, almost parallel sided in basal three quarters (fig. 26), in ventral view, broadest in basal half, angled at about right angles basomesally (fig. 27).

Female. Unknown.

Etymology. Cristata – Latin for tufted or crested (hairs at tip of inferior appendages).

Remarks. Chimarra cristata is known from two male specimens from separate localities in the Eastern Highlands of PNG.

Figures

Figures 26–34. Chimarra spp.; 26–28, Chimarra cristata sp. nov., male, holotype, genitalia; 26, lateral; 27, ventral; 28, dorsal. 29–31, Chimarra projectura sp. nov., male, holotype, genitalia; 29, lateral; 30, ventral; 31, dorsal. 32–34, Chimarra toliana sp. nov., male, holotype, genitalia; 32, lateral; 33, ventral; 34, dorsal.