Chimarra guentheri Mey, 2006

Cartwright, David, 2020, A review of the New Guinea species of Chimarra Stephens (Trichoptera: Philopotamidae), Memoirs of Museum Victoria 79, pp. 1-49 : 6

Chimarra guentheri Mey, 2006

Figures 4–6

Chimarra guentheri Mey, 2006: 261 , figs 1–4.

Type material (not seen). Holotype. Male (abdomen mounted as microscope preparation, genitalia slide Mey 22/06). ( PNG, East Sepik Province) “D.N. Guinea T.40/Lager 7 26. V. 12/Kaiserin Augusta Fluss Expedition/Burgers S.G.” ( MNHU).

Material examined. PNG. 1 male (dried, pinned specimen CT-398 figured), (south-east Oro Province), Mount Suckling , 500 m (about 9° 45' S, 148° 58' E), 11–16 July 1972, J.L. Gressitt ( BPBM) .

Diagnosis. The males of C. guentheri Mey and C. eltuna Oláh can be separated from other New Guinea species by the very elongate and distally slightly dilated ventral process on segment IX. Chimarra guentheri is most similar to C. eltuna , especially in the length and shape of the ventral process on segment IX, but differs slightly in lateral view in that the ventral margin of the inferior appendages is less incised in the distal third, the elongate ventral process has a cluster of fine spinules on the ventral surface, and the phallus has one or two elongate, internal spines subapically.

Description. (Revised after Mey, 2006). General body colour and wings light brown to brown. Wings ( Mey, 2006: fig. 4) similar to C. ukarumpana (fig. 7). Length of forewing: male 4.1–4.4 mm. Forewing with forks 1, 2, 3 and 5 present, Rs sinuous or curved, thickened basad of discoidal cell; hind wing with forks 1, 2, 3 and 5 present ( Mey, 2006).

Male. Segment IX anterior margin in lateral view, with angular extension ventrally (fig. 4); ventral process slender, rod-like, very elongate, reaching almost length of inferior appendages, dilated in apical third, with fine spinules along ventral margin (figs 4, 5), length in lateral view about 6.5 times maximum width (fig. 4), preanal appendages small and rounded apically (figs 4, 6). Segment X with pair of lateral lobes, short, hair-like sensilla visible in basal half (fig. 6; Mey, 2006: figs 1–2), lobes, in lateral view, broad basally, tapered slightly in distal half (fig. 4), in dorsal view, slender, with apices slightly out-turned (fig. 6). Phallus with one or two (two shown in Mey 2006: figs 1–2) slender internal spines subapically (figs 4, 6). Inferior appendages robust, somewhat semicircular, with acute, posteromesally directed apices (figs 4–6), in lateral view angled at about 45° to horizontal, length about 2.8 times width, broadest near middle, ventral margin rounded, dorsal margin straight, narrowed in basal third, tapered distally (fig. 4), appearing truncate in Mey (2006: fig. 1) due to obscured, inflexed apices, in ventral and dorsal views, broadest in basal two thirds, with outer margin rounded and apices acute and inflexed, nearly meeting dorsal to phallus (fig. 5; Mey, 2006: figs 2–3).

Female. Unknown.

Remarks. Chimarra guentheri is known from the holotype male and one other male from two localities in the East Sepik and Oro provinces of PNG. These localities are about 1000 km apart (in a straight line). New figures have been drawn to allow direct comparisons and to accompany the description that is revised in light of new interpretations of Chimarra genitalic structures from Mey’s (2006) original description.

Figures

Figures 1–7. Chimarra spp.; 1–3, Chimarra pertica sp. nov., male, holotype, genitalia; 1, lateral; 2, ventral; 3, dorsal. 4–6, Chimarra guentheri Mey, male, genitalia; 4, lateral; 5, ventral; 6, dorsal. 7, Chimarra ukarumpana sp. nov., male, holotype; 7, wings.