Chimarra absida, 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 : 18

Chimarra absida sp. nov.

Figures 47–49

Holotype. Male (specimen in alcohol, CT-346 figured), PNG, West Highlands Province, Trauna River , Bayer River Sanctuary , 1160 m, about 5° 30' S, 144° 10' E, UV light, 16 June 1986, A. Wells ( NMV, T-22456).

Paratype. 1 Male (CT-370), PNG, north-east, Lae , Singuawa R., 30 m, about 6° 45' S, 147° 10' E, 3 April 1966, O.R. Wilkes ( BPBM) .

Diagnosis. The males of C. absida are most similar to C. holda Oláh in having the ventral margin of the inferior appendages short, curved and convex in lateral view, and a series of small embedded spines positioned across the phallus subapically. Chimarra absida can be separated from C. holda Oláh by the more robust inferior appendages with right angle present basomesally, as viewed ventrally. Chimarra absida is also superficially similar to the northern Australian species C. stclairae Cartwright but lacks the two small processes on the mid-mesal margin of the inferior appendages.

Description. General body colour and wings light brown. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.4 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 anteroventral margin in lateral view greatly produced and rounded (fig. 47); ventral process short, triangular with acute apex, basal to posterior margin of segment IX (figs 47, 48), length about twice width (fig. 47); preanal appendages rounded apically (figs 47, 48). Segment X mesal lobes robust, appear truncate in lateral view and triangular in dorsal view (figs 47, 49), lateral lobes robust, with sensilla not discerned (fig. 49), in lateral view, lateral lobes dilated and downturned slightly in distal half, apices rounded (fig. 47), in ventral and dorsal views lateral lobes tapered slightly distally to attenuate apices (figs 48, 49). Phallus with four short, slender spines included subapically and at about two-thirds length, angled across phallus. Inferior appendages short, stout, with acute apices directed posteromesally (figs 47, 49), in lateral view angled at about 30° to horizontal, length about 2.4 times width, broadest near middle, tapered slightly basally and distally with dorsally directed apices, dorsal margin slightly concave, ventral margin strongly convex (fig. 47), in ventral view appears truncate, disto-mesal margin with 90° angle (fig. 48).

Female. Unknown.

Etymology. Absida – Latin for arc, segment of circle (ventral margin of inferior appendages).

Remarks. Chimarra absida is known from two male specimens from separate localities in in central and eastern PNG.

Figures

Figures 44–52. Chimarra spp.; 44–46, Chimarra kuka sp. nov., male, holotype, genitalia; 44, lateral; 45, ventral; 46, dorsal. 47–49, Chimarra absida sp. nov., male, holotype, genitalia; 47, lateral; 48, ventral; 49, dorsal. 50–52, Chimarra oláhi sp. nov., male, holotype, genitalia; 50, lateral; 51, ventral; 52, dorsal.