Chimarra kolombangensis, 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 : 33-34

Chimarra kolombangensis , new species

Figs 5 , 26–30

Diagnosis. This species resembles C. veveensis (described above), particularly in the greatly produced anteroventral margin of segment IX, elongate inferior appendages, and elongate, slender phallobase. Chimarra kolombangensis is distinguished from C. veveensis in lateral view of the genitalia, by having a nearly triangular anteroventral part of segment IX, and inferior appendages are shorter, with basal part more angular.

Description. Wings ( Fig. 5 ): Forewings each 4.1 mm long, membrane pale grey, except brownish at basal half and along anterior margin; veins dark brown. Hind wings each 3.4 mm long, membrane uniformly grey; veins brown.

Male Genitalia ( Figs 26–30 ): Segment IX very long, anteroventral part narrowly triangular in lateral view ( Fig. 26 ); each anterodorsal margin concave, rounded; ventral margin slightly convex in lateral view and without ventral process; each posterior margin nearly straight, without outgrowth above inferior appendage; setae restricted to posterior margin below preanal appendages; in ventral view ( Fig. 28 ) with nearly straight, nearly parallel-sided lateral margins and evenly concave posterior margin; anterior margin deeply concave; in dorsal view ( Fig. 27 ) parallel-sided, lateral margins pointed anteriorly; tergite anteriorly deeply concave, Ushaped. Tergite IX short much shorter than sternite, without process near base of tergum X. Anterior apodemes absent. Preanal appendages located basally on tergum X, about 0.05 mm long, directed posterolaterad; irregularly rounded in lateral and dorsal views ( Figs 26, 27 ). Tergum X about half as long as inferior appendages, without setae, formed by pair of thick, ventrad-curving lateral lobes being separated at base of tergum X; nearly parallel-sided in lateral view ( Fig. 26 ); in dorsal view each lateral lobe parallel-sided along its length; each lateral lobe with apex obliquely truncate, longer laterally, with 2 of sensillae seen in lateral view. Inferior appendages nearly straight along their length; central plate compact, short ( Fig. 26 ); basal half of each inferior appendage slightly wider than distal half; each inferior appendage parallel-sided from distal half in lateral view; in ventral view inferior appendages subparallel ( Fig. 28 ), each inferior appendage with broad meso-basal plate with rounded posteromesal corner; appendage sharply narrower beyond this plate, slightly sigmoid, with slightly mesad-curving apex. Sclerotized portion of phallic apparatus long, slender, phallotheca nearly cylindrical from half its length in lateral and ventral views ( Figs 29, 30 ); phallobase about 3 times thicker than rest of phallotheca in lateral view ( Fig. 29 ), and twice as thick as rest of phallotheca in ventral view ( Fig. 30 ); posteroventral margin of phallotheca produced into short horizontal spine. Phallotremal sclerite complex with thin dorsal and thick ventral plates in lateral view; in ventral view ( Fig. 30 ) forming broad plate with 4 anterior lobes and 2 posterior lobes; minute spines densely packed immediately posteriorly of phallotremal sclerite inside retracted phallotheca; pair of nearly equally large endothecal spines present apically in retracted phallotheca, posterior spine more strongly curved than anterior spine.

Holotype male: Solomon Islands: Western Province, Kolombangara Island, Poitete River 200 m WSW Poitete on road L 44, 103 m, loc 15, 7 °53.440'S 157°07.516'E, light trap, 14.i.2008 [M Espeland].

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]; 1 male, Western Province, Kolombangara Island, ENE slope, 1 km W end of road L 28, 291 m, loc 0 2, 7 °56.583'S 157°08.427'E, light trap, 7.i.2008 [M Espeland]; 13 males, Western Province, Kolombangara Island, ENE slope, 2.5 km W end of road L 28, 421 m, loc 0 3, 7 °56.629'S 157°07.603'E, light trap, 8.i.2008 [M Espeland]; 1 male, Western Province, Kolombangara Island, stream between roads R3 and R3A, crossing main road 2 km N Shadow River, loc 10, light trap, 14.i.2008 [M Espeland]; 1 male, 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]; 12 males, Western Province, Kolombangara Island, Poitete River 200 m WSW Poitete on road L 44, 99 m, loc 16, 7 °53.375'S 157°07.529'E, light trap, 14.i.2008 [M Espeland]; 6 males, Western Province, Kolombangara Island, Vila River 1 km N Ringi Company Town, 70 m, loc 18, 8 °06.382'S 157°07.916'E, light trap, 15.i.2008 [M Espeland]; 27 males, Guadalcanal Province, Guadalcanal, Weather Coast, Kusumba Region, Talin River, 30 m S junction with Rosava River, 70 m, loc 19, 9 °36.724'S 159°41.234'E, light trap, 25.i.2008 [M Espeland].

Etymology. Kolombangensis , derived from Kolombangara Island, 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 26 – 30. Chimarra kolombangensis, new species, holotype, male. 26 — genitalia, left lateral; 27 — genitalia, dorsal; 28 — genitalia, ventral; 29 — phallic apparatus, left lateral; 30 — phallic apparatus, ventral.