Chimarra aiyura Korboot, 1965

Cartwright, David, 2020, A review of the New Guinea species of Chimarra Stephens (Trichoptera: Philopotamidae), Memoirs of Museum Victoria 79, pp. 1-49 : 25-27

Chimarra aiyura Korboot, 1965

Figures 78, 79

Chimarra aiyura Kooboot, 1965: 40 , figs 1–4.— Neboiss, 1986a: 105.— Neboiss, 1987a: 132, figs 4–6.

Type material not seen. Holotype. Male. PNG, Eastern Highlands, Aiyura , 5500 feet (1676 m, 6° 20' S, 145° 53' E), 12 September 1960, J.H. Barrett ( QM, T-6205).

Paratype. PNG, male (gen prep. PT-1307 figured in Neboiss, 1986 a, 1987a), collected with holotype (Deptartment of Entomology, University of Queensland).

Material examined. 1 male (in alcohol, specimen CT-348 partly figured), PNG: Eastern Highlands, Ukarumpa, Bai River (about 6° 34' S, 145° 88' E), lt tr, 22 June 1986, A. Wells ( NMV) .

Diagnosis. The males of C. aiyura can be separated from C. newguineana and C. sedlaceki , in particular, and all other New Guinea species, by the combination of the inferior appendages in lateral view angled at about 30° to horizontal with irregular, serrated meso-ventral margin and the lateral lobes of segment X with triangular flanges in the basal half and slightly out turned apices and the emergent apical spine on the phallus (or acute ventromesal projection of the phallobase?).

Description (revised after Korboot, 1965, Neboiss, 1987a). General body colour and wings fawn (faded; personal observation) to yellowish head and thorax with blackish wings ( Korboot, 1965: p. 40). Wings ( Korboot, 1965: fig. 1) similar to those of C. ukarumpana (fig. 7). Length of forewing: male 5.5– 5.7 mm. Forewings with forks 1, 2, 3 and 5 present, Rs straight, not thickened ( Korboot, 1965: fig. 1) to slightly sinuous or curved, moderately thickened, basad of discoidal cell (personal observation); hind wing with forks 1, 2, 3 and 5 present.

Male. Segment IX anterior margin in lateral view, anteroventrally weakly angled or rounded, ventral process short, basal to distal margin of segment IX, in lateral view, keel-like, length about same as width, preanal appendages with rounded apices, in lateral view appear rounded (fig. 78; Neboiss, 1987a: fig. 4), in dorsal view appear ovate (fig. 79). Segment X lateral lobes laterally compressed with sensilla not discerned (figs 78, 79), in dorsal view, lateral lobes appear slender with small, triangular flange in basal half, apices slightly out turned (fig. 79; Neboiss, 1987a: fig. 5). Phallus with two slender spines included subapically and one emergent apical spine (or acute ventromesal projection of the phallobase?; figs 78, 79; Neboiss, 1987a: figs 4, 6). Inferior appendages slender, broadest in basal third, narrowed slightly near middle, tapered slightly in distal half, apices acute and directed slightly posteromesally (figs 78, 79), in lateral view, angled at about 30° to horizontal, length about 3.3 times width, dorsal margin slightly concave in basal half and ventral margin slightly irregularly convex in basal half and almost straight in distal half (fig. 78; Neboiss, 1987a: fig. 4), in dorsal view, mesal and lateral margins slightly curved (fig. 79; Neboiss, 1987a: fig. 5).

Female. Unknown.

Remarks. Chimarra aiyura is known from three males from two adjacent localities in the Eastern Highlands of PNG. 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 Korboot’s (1965) original and Neboiss’ (1987a) revised description. Neboiss examined the holotype abdomen mounted on a slide but found the individual appendages difficult to interpret, so he cleared the paratype abdomen, compared it with the holotype and prepared new figures ( Neboiss 1987a: 132; figs 4–6). I have followed Neboiss’ interpretation and figures.

Figures

Figures 78–85.Chimarra spp.; 78–79, Chimarra aiyura Korboot, male, genitalia; 78, lateral; 79, dorsal. 80–82, Chimarra bicuspidis sp. nov., male, holotype, genitalia; 80, lateral; 81, ventral; 82, dorsal. 83–85, Chimarra bifida sp. nov., male, holotype, genitalia; 83, lateral; 84, ventral; 85, dorsal.