Chimarra morobensis, 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 : 25

Chimarra morobensis sp. nov.

Figures 72–74

Holotype. Male (dried, pinned specimen CT-359 figured), PNG, Morobe District, Wau , 1200 m, about 7° 20' S, 146° 43' E, Malaise Trap, 7 July 1961, J. Sedlacek ( BPBM).

Diagnosis. The male of C. morobensis can be separated from all other New Guinea species, including C. sappela , by the combination of the robust pincer-like inferior appendages, with ventral margin angled obtusely near middle, tapered in distal half, with slender, meso-distally pointed digitiform apices, in lateral view, plus the ventrad directed ventral lobes of segment X, convergent ventrally supporting the phallus.

Description. General body colour and wings fawn. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 4.9 mm. Forewings 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, with acute angular extension ventrally and small rounded extension dorsally (fig. 72), ventral process short, laterally compressed, basal to distal margin of segment IX (figs 72, 73), in lateral view appears rounded apically, length about 1.1 times width (fig. 72), in ventral view appears triangular, apically acute (fig. 73), preanal appendages, in lateral view appear sub-rectangular (fig. 72), in dorsal view appear sub-triangular (fig. 74). Segment X lateral lobes aligned laterad to phallus, hard to discern, with sensilla not discerned (figs 72, 74), in lateral view, ventral lobes slightly angled downwards, supporting phallus, apices appear acute (fig. 72). Phallus with two slender, relatively elongate spines embedded subapically (figs 72–74). Inferior appendages elongate, broadest in basal half, narrowed near midlength, tapered distally, apices acute, directed posteromesally (figs 72–74), in lateral view, angled at about 30° to horizontal, length about 4 times width, dorsal margin almost straight (fig. 72), in ventral view, lateral margins curved, mesal margin irregular near midlength, slightly concave in distal half (fig. 73).

Female. Unknown.

Etymology. Morobensis – Named after the type locality (Morobe Province).

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

Figures

Figures 70–77.Chimarra spp.; 70–71, Chimarra sedlaceki Sykora, male, genitalia; 70, lateral; 71, dorsal. 72–74, Chimarra morobensis sp. nov., male, holotype, genitalia; 72, lateral; 73, ventral; 74, dorsal. 75–77, Chimarra damma sp. nov., male, holotype, genitalia; 75, lateral; 76, ventral; 77, dorsal.