Chimarra maculata, Johanson, Kjell Arne & Espeland, Marianne, 2010

Johanson, Kjell Arne & Espeland, Marianne, 2010, Description of new Chimarra (Trichoptera: Philopotamidae) species from the Solomon Islands, Zootaxa 2638, pp. 25-43 : 28-30

Chimarra maculata , new species

Figs 2 , 11–15

Diagnosis: This species is unique among the Chimarra of the Solomon Islands in having dark forewings and hind wings, each with a large, nearly circular, whitish hyaline field centrally on the wing area. Another species in the genus, C. formosae Botosaneanu & Vos, 2006 , from West Papua ( Indonesia), has similar wing pattern, except that the wing spots cover a larger proportion of the wing surface in C. formosae . In addition, the genitalia of C. maculata are completely different from those of C. formosae , particularly in the much more slender and nearly straight inferior appendages, and the presence of a ventral process on segment IX. Two Northern Territory Australian Chimarra species, C. luminaris Cartwright, 2002 , and C. locolo Cartwright, 2002 , also have a hyaline area centrally in each forewing. A similar hyaline area is present in each hind wing of C. locolo . In these 2 species, the hyaline areas are much smaller than in C. maculata , and the genitalia are different, i.e. in C. maculata a ventral process is present on sternite IX (absent in C. luminaries and C. locolo ), the inferior appendages are nearly parallel sided and slender (broad in C. luminaries and strongly tapering apically in C. locolo ), the superior appendages are circular (slender in C. luminaries and C. locolo ), and the lateral lobe of tergum X is broad, long, and ventrad-curving (short, slender and nearly straight in C. luminaries and C. locolo )

Description: Wings ( Fig. 2 ): Forewings each 6.8 mm long, membrane dark brown and veins nearly black; large, whitish, hyaline area present centrally in wing. Hind wings each 5.7 mm long, membrane brown, more grey posteriorly, veins dark brown; large, whitish, hyaline area present centrally in wing.

Male Genitalia ( Figs 11–15 ): Sternite IX long, produced anterad into rounded plate in lateral view; in ventral view ( Fig. 13 ) with convex lateral margins and straight posterior margin; setae restricted to posterior and posteroventral margins; anterior margins each with deep, triangular incision. Ventral process of sternite IX rectangular in lateral view ( Fig. 11 ), rounded triangular in ventral view ( Fig. 13 ). In lateral view, segment IX much shorter from about mid-height ( Fig. 11 ). Tergite short in lateral view; central part membranous in dorsal view ( Fig. 12 ). Pair of anterior apodemes about as long as ventral process ( Fig. 11 ). Preanal appendages located immediately above mid-height of segment IX; rounded, setose; in dorsal view ( Fig. 12 ) directed posterolaterad. Tergum X with pair of long, ventrad-curving lateral lobes; slightly narrowing apically in lateral view; in dorsal view nearly parallel-sided; without setae; 2 sensillae located dorsolaterally on apex of each lateral lobe. Inferior appendages fused basally on compressed central plate projecting horizontally anterad; curving dorsad before mid-length; distal 2/3rds of each appendage nearly straight in lateral view; curving mesad from mid-length and apices nearly meeting above tergum X ( Fig. 12 ). Phallic apparatus long, with bulbous anterior half and tubular posterior half in lateral and ventral views ( Figs 14, 15 ). Phallotremal sclerite complex with small processes in lateral view; nearly heart-shaped in ventral view; endotheca with many endothecal micro-spines inside distal part of retracted phallotheca; single, large ventroapical spine forming posterior continuation of phallobase.

Holotype male: Solomon Islands: Western Province, Kolombangara Island, N slope of Mt. Veve, 2.5 km S end of road L 57, 723 m, loc 11, 7 °55.494'S 157°02.986'E, light trap, 12.i.2008 [M Espeland].

Paratypes: Solomon Islands: 2 males, Western Province, Kolombangara Island, ENE slope, 1 km W end of road L 28. 291 m, loc 0 1, 7 °56.583'S 157°08.427'E, light trap, 7.i.2008 [M Espeland].

Etymology: Maculata , from macula, “spot” in Latin, referring to the pale wing spots in the forewings and hind wings of this species.

Figures

FIGURES 2 – 10. Right forewing and hind wing of holotypes of new Chimarra species. 2 — C. maculata, new species; 3 — C. talinensis, new species; 4 — C. veveensis, new species; 5 — C. kolombangensis, new species; 6 — C. babarensis, new species; 7 — C. vitapinensis, new species; 8 — C. ventrospina, new species; 9 — C. solomonensis, new species; 10 — C. rosavensis, new species.

FIGURES 11 – 15. Chimarra maculata, new species, holotype, male. 11 — genitalia, left lateral; 12 — genitalia, dorsal; 13 — genitalia, ventral; 14 — phallic apparatus, left lateral; 15 — phallic apparatus, ventral.