Chimarra espelandae, 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 : 35

Chimarra espelandae sp. nov.

Figures 108–110

Holotype. Male (in alcohol, figured specimen CT-332), PNG, Central Province, Iomari Creek , Bereima , Port Moresby Rd , about 9° 25' S, 147° 15' E, 23 May 1986, A. Wells and W. Ismay ( NMV, T-22460).

Paratypes. PNG. 3 males (in alcohol, CT-343), collected with holotype ( NMV) .

Diagnosis. The males of C. espelandae can be separated from all other New Guinea species by the combination of the sub-triangular inferior appendages in lateral view and the digitiform projection on the mesal margin of the inferior appendages.

Description. General body colour and wings pale or fawn (faded). Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 3.8–4.0 mm. Forewing with forks 1, 2, 3 and 5 present, Rs moderately sinuous or curved, strongly thickened, basad of discoidal cell; hind wing with forks 1, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, with rounded extension ventrally (fig. 108), ventral process short, strongly basal to distal margin of segment IX (figs 108, 109), in lateral view keel-like, length about half basal width, rounded distal margin (fig. 108), in ventral view, appears slender with acute apex (fig. 109), preanal appendages appear digitiform in lateral view (fig. 108), slightly angular or sub-triangular in dorsal view (fig. 110). Segment X lateral lobes robust, sensilla not discerned (figs 108, 110), in lateral view, appear dilated slightly in distal half, angled disto-ventrally (fig. 108), in dorsal and ventral views appear sub-truncate distally (figs 109, 110). Phallus with two slender spines included subapically, basal spine more elongate. Inferior appendages broadest in basal half, tapered in distal half, apices directed posteromesally, acute (figs 108–110), in lateral view, angled at about 75° to horizontal, sub-triangular, length about twice maximum width, dorsal margin slightly concave in basal half, almost straight in distal half, ventral margin strongly angled in basal half, mostly straight in distal half (fig. 108), in ventral and dorsal views, mesal and lateral margins slightly curved (figs 109, 110), in ventral view, mesal margin with digitiform projection in basal third (fig. 109).

Female. Unknown.

Etymology. Espelandae – named after Marianne Espeland for her contribution to the study of Chimarra from the Solomon Islands.

Remarks. Chimarra espelandae is known from four males collected from the type locality in south-east PNG.

Figures

Figures 103–110. Chimarra spp.; 103–105, Chimarra erecta sp. nov., male, holotype, genitalia; 103, lateral; 104, ventral; 105, dorsal. 106–107, Chimarra kokodana Kimmins, male, genitalia; 106, lateral; 107, dorsal. 108–110, Chimarra espelandae sp. nov., male, holotype, genitalia; 108, lateral; 109, ventral; 110, dorsal.