Chimarra solomonensis, 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 : 39-40

Chimarra solomonensis , new species

Figs 9 , 46–50

Diagnosis: This species is characterized among the Chimarra species from the Solomon Islands by the combination of segment IX oblong, rhomboid in lateral view, and inferior appendages long, triangular in lateral view and nearly rectangular in ventral view. Chimarra species from the Fiji Islands, like C. manni ( Banks, 1924) and C. obscurella ( Banks, 1924) , and the E Australian C. australica Ulmer, 1916 , have similar triangular inferior appendages, but a shorter and more rounded segment IX.

Description: Wings ( Fig. 9 ): Forewings each 5.0 mm long, membrane uniformly grey; veins brown. Hind wings each 4.1 mm long, membrane uniformly pale grey; veins brown.

Male Genitalia ( Figs 46–50 ): Segment IX long, nearly rectangular in lateral view ( Fig. 46 ); each side with anterodorsal margin nearly straight, anterior margin rounded, ventral margin nearly straight and rounded in lateral view, without ventral process; below each preanal appendage posterior margin forming short, nearly rounded convex plate; setae present along each posterior margin from well below preanal appendage; in ventral view ( Fig. 48 ) segment IX about as wide as long, nearly uniformly wide along its length, with slightly rounded lateral margins at posterior ends; posterior margin widely and shallowly concave; anterior margin with wide triangular incision; in dorsal view ( Fig. 47 ) tergum IX very short, forming narrow, transverse band above tergum X; lateral margins slightly convex, each lateral plate narrow anteriorly. Pair of anterior apodemes visible in dorsal view at U-shaped mesal margin, each located about 0.1 mm anteriorly of preanal appendages. Preanal appendages originating from posterodorsal end of tergum IX and base of dorsal margin of tergum X, about 0.05 mm long, orienteddirected posterad; each with irregularly dilated apex in lateral view ( Fig. 46 ), forming short, irregular wart in dorsal view ( Fig. 47 ). Tergum X divided into membranous mesal lobe and pair of sclerotized lateral lobes ( Figs 46, 47 ). Mesal lobe visible in lateral view as oblong tissue immediately above basal part of lateral lobes, about 1/3rd as long as lateral lobes ( Fig. 46 ), without setae; basally parallel-sided, narrowing apically in dorsal view ( Fig. 47 ), with wide posteromesal incision. Lateral lobes without setae, originating from dorsal part of segment IX; in lateral view ( Fig. 46 ), each lateral lobe broad at base, narrowing apically, oriented posteroventrally, apex forming dorsal hook; in dorsal view ( Fig. 47 ), lateral lobes uniformly curving laterad, each forming narrow lateral plate outside mesal lobe; lateral and mesal margins of each lateral lobe nearly parallel-sided. Lateral lobes well separated basally; sensillae on lateral lobes not detected. Inferior appendages with long central plate ( Fig. 46 ); irregular anteriorly in lateral view; inferior appendages forming large, sharp triangular plates, pointing posterodorsally, nearly twice as long as high; each appendage with dark ridge running transversely on dorsal face of mesobasal plates ( Fig. 48 ), forming dark spot at posteroventral corner of inferior appendages in lateral view ( Fig. 46 ); dorsal and ventral margins above dark ridge nearly straight; in ventral view ( Fig. 48 ) inferior appendages nearly rectangular, oriented posterad, almost parallel, with nearly straight lateral margins; each with mesobasal plate long, uniformly broad, with irregularly concave mesal margin. Sclerotized portion of phallic apparatus long, thick; phallobase occupying about half length of phallotheca, almost 3 times thicker than cylindrical posterior part of phallotheca ( Figs 49, 50 ); posteroventral margin of phallotheca produced ventrally into irregular, rectangular plate in lateral view ( Fig. 49 ). Phallotremal sclerite complex small, slender, U-shaped with small additional posterior spine on transverse bar; 2-branched in ventral view; 2 large, posterad-pointing endothecal spines present distally in phallotremal sclerite complex.

Holotype male: Solomon Islands: Western Province, Kolombangara Island, stream parallel to road L 8, 4 km NW main road, 269 m, loc 0 8, 8 °01.233'S 157°08.090'E, light trap, 11.i.2008 [M Espeland].

! "

# $ %& ' ()*+&*%,- *)(%&" - & & ((%./ 0 "

# $ % ' ()*+&*%,- *)(%&" - & & ((%./ 0 4 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]; 3 males, Western Province, Kolombangara Island, ENE slope, 2.5 km W end of road L 28, 421 m, loc 0 4, 07 °56.629'S 157°07.603'E, light trap, 8.i.2008 [M Espeland]; 3 males, 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]; 2 males, 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]; 1 male, Western Province, Kolombangara Island, Vila River 1 km N Ringi Company Town, 70 m, loc 17, 8 °06.382'S 157°07.916'E, light trap, 15.i.2008 [M Espeland]; 1 male, 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]; 10 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. Solomonensis , from Solomon Islands, the type country 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 46 – 50. Chimarra solomonensis, new species, holotype, male. 46 — genitalia, left lateral; 47 — genitalia, dorsal; 48 — genitalia, ventral; 49 — phallic apparatus, left lateral; 50 — phallic apparatus, ventral.