Chimarra vitapinensis, 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 : 36-37

Chimarra vitapinensis , new species

Figs 7 , 36–40

Diagnosis. The genitalia of C. vitapinensis are unique among Solomon Island Chimarra species, in particular segment IX is nearly drop-shaped in lateral view, the inferior appendages are sigmoid shaped in lateral view, and the membranous mesal lobe of tergum X is triangular in dorsal view. Some of the New Guinean Chimarra species have similar inferior appendages, like C. papuana, Kimmins, 1962 , and C. sabrona Kimmins, 1962 , but all these species have an anteriorly produced segment IX, and a large ventral process.

Description: Wings ( Fig. 7 ): Forewings each 4.4 mm long, membrane uniformly pale grey; veins brown to dark brown; veins and neighbourhood membrane of basal part of Dc nearly black. Hind wings each 3.7 mm long, membrane uniformly pale grey; veins brown to dark brown.

Male Genitalia ( Figs 36–40 ): Segment IX rather short, nearly drop-shaped, with anteroventral part ellipsoid in lateral view ( Fig. 36 ); each anterodorsal margin undulated; ventral margin slightly convex and angled in lateral view, without ventral process; each posterior margin undulated, with rounded outgrowth immediately above inferior appendage; setae restricted to mid-height of posterior margin; in ventral view ( Fig. 38 ) segment IX slightly narrowing posteriorly, with undulated lateral margins and widely and shallowly concave posterior margin; anterior margin convex, without mesal incision; in dorsal view ( Fig. 37 ) with nearly parallel lateral margins, each lateral plate tapering at anterior apex; tergite membranous. Tergite IX short, without process near base of tergum X. Anterior apodemes absent. Preanal appendages located on posterior margin of segment IX well below dorsal margin ( Fig. 36 ), about 0.05 mm long, directed dorsolaterad; smoothly rounded in lateral view ( Fig. 36 ), narrower in dorsal view ( Fig. 37 ). Tergum X divided into long, membranous mesal lobe and pair of sclerotized lateral lobes ( Figs 39, 37 ). Mesal lobe sharply triangular in lateral view, about half as long as and located well above lateral lobes ( Fig. 36 ), triangular in dorsal view ( Fig. 37 ); about half as long as inferior appendages, without setae. Lateral lobes without setae, originating from near bases of preanal appendages; in lateral view ( Fig. 36 ), each lateral lobe straight, with basal half parallel-sided, distal half tapering into up-curving apex; in dorsal view, lateral lobes straight, slightly converging; mesal margins slightly convex, lateral margins irregular along distal half, apex rounded ( Fig. 37 ). Lateral lobes widely separated basally by mesal lobe; distal half of each lateral lobe with 2 sensillae along dorsal margin. Inferior appendages with compact, short central plate ( Fig. 36 ); basal half of each inferior appendage nearly straight, oriented posteroventrad; lateral part bending dorsad to form vertical, narrowing plate, and long, cylindrical, posteromesad-oriented apex ( Figs 36, 38 ); in ventral view ( Fig. 38 ) each inferior appendage with long mesobasal plate with irregular mesal margin. Sclerotized portion of phallic apparatus long, slender; phallotheca nearly cylindrical from before half its length in lateral and ventral views ( Figs 39, 40 ); phallobase about as thick as rest of phallotheca in lateral view, and twice as thick as rest of phallotheca in ventral view; posteroventral margin of phallotheca apparently not strongly produced posterad in lateral view ( Fig. 39 ). Phallotremal sclerite complex not observed; pair of equally long, slightly curved endothecal spines present distally in retracted phallotheca.

Holotype male: Solomon Islands: Guadalcanal Province, Guadalcanal, Weather Coast, Kusumba Region, small stream 400 m S Vutapinau Village, loc 22, 9 °36.713'S 159°40.598'E, light trap, 26.i.2008 [M Espeland].

Paratypes: Solomon Islands: 11 males, same data as holotype; 4 males, Western Province, Kolombangara Island, stream crossing main road, 200 m N road L 2, 158 m, loc 0 6, 8 °04.520'S 157°08.845'E, Malaise trap, 11–15.i.2008 [M Espeland].

Etymology. Vitapinensis , derived from Vitapinau Village, the type locality of the 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 36 – 40. Chimarra vitapinensis, new species, holotype, male. 36 — genitalia, left lateral; 37 — genitalia, dorsal; 38 — genitalia, ventral; 39 — phallic apparatus, left lateral; 40 — phallic apparatus, ventral.