Chimarra olahi, 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 olahi sp. nov.

Figures 50–52

Holotype. Male (dried, pinned specimen CT-341 figured), Indonesia, Papua Province (West Papua), Star Range, 1300 m, about 5° 00' S, 141° 00' E, 26 June 1959, Museum Leiden, Netherlands, New Guinea exp. ( RMNH).

Diagnosis. The male of C. oláhi can be separated from all other New Guinea species by the combination of a distinctive flange on the posteroventral margin of the inferior appendages and a ventral process on segment X, which is short and acute apically. Chimarra simbuensis sp. nov. (fig. 153) also has a strong flange, but on the mesal margin of the inferior appendages, and the ventral process on segment IX is a very weak keel.

Description. General body colour and wings fawn (faded). Wings similar to those of C. ukarumpana (fig. 7). Length of forewing:male 5.5 mm. Forewing with forks 1, 2, 3 and 5 present, Rs moderately sinuous or curved, moderately 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, weak extension ventrally (fig. 50); ventral process short, triangular, apically acute, inserted at about half length of ventral margin of segment IX (figs 50, 51), in lateral view length about twice width (fig. 50); preanal appendages ovoid, rounded apically (figs 50, 51). Segment X with sensilla not discerned (fig. 52), lateral lobes robust, platelike, laterad of and ventral to phallus, slightly tapered distally to rounded apices (figs 50–52). Phallus with two slender spines included subapically (figs 50– 52). Inferior appendages robust, broadest in basal half, tapered slightly distally, acute apices directed slightly posteromesally, in lateral view angled at about 60° to horizontal, sub-triangular, length about 2.6 times maximum width, ventral margin angled obtusely in basal half, dorsal margin almost straight (fig. 50), in ventral view slender in distal half, mesal margin angled at about 90° near middle, narrow flange on posteroventral margin (fig. 51).

Female. Unknown.

Etymology. Named for János Oláh for his contribution to the study of Chimarra from Fiji and Batanta Island ( Indonesia).

Remarks. Chimarra olahi is known only from the holotype male from Papua.

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.