Chimarra vitapinensis Johanson & Espeland, 2010, new species
Creators: name: Johanson, Kjell Arne
name: Espeland, Marianne
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Philopotamidae
Chimarra
Chimarra vitapinensis

description: 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.
description: Published as part of Johanson, Kjell Arne & Espeland, Marianne, 2010, Description of new Chimarra (Trichoptera: Philopotamidae) species from the Solomon Islands, pp. 25-43 in Zootaxa 2638 on pages 36-37, DOI: 10.5281/zenodo.198496