Chimarra talinensis, 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 : 30-31

Chimarra talinensis , new species

Figs 3 , 16–20

Diagnosis: The presence of a prominent ventral process of segment IX and short tergum X, together with a characteristic shape of the inferior appendages, and number and size of endothecal spines makes this species unique among the Solomon Island Chimarra species. Several Chimarra species from New Guinea have a long ventral process, but in C. talinensis , this process is nearly as long as segment IX. In addition to having a long ventral process, C. papuana Kimmins, 1962 , has inferior appendages divided into a broad basal part and a more narrow distal part, but in C. talinensis , the basal part is more rounded, and the distal part is thicker. In the phallic apparatus the retracted endotheca has a very large endothecal spine as well as about 5 smaller spines. This combination of spines is not seen in similar species.

Description: Wings ( Fig. 3 ): Forewings each 3.4 mm long, membrane greyish, more brownish near anterior margin and anal area; veins brown. Hind wings each 2.8 mm long, membrane uniformly greyish; veins brown.

Male Genitalia ( Figs 11–15 ): Sternite IX shorter than high, each side with anteroventral corner forming minute triangle in lateral view ( Fig. 16 ); each anterior margin nearly straight above ventral triangular process; ventral margin weakly convex in lateral view; each posterior margin forming rounded plate with setae in small group; in ventral view ( Fig. 18 ) with convex lateral margins and straight posterior margin; anterior margin weakly concave. Ventral process very large, nearly as long as segment IX in lateral view ( Fig. 16 ); widening along its length in lateral view; narrowing in ventral view ( Fig. 18 ), with dilated apex. Tergite IX short in lateral view; central part sclerotized in dorsal view ( Fig. 17 ). Anterior apodemes absent. Preanal appendages located dorsally on segment IX, about 0.05 mm long; in dorsal view ( Fig. 17 ) directed posterad. Tergum X without setae; oval in lateral view; in dorsal view with basal half fused, forming broad, parallel-sided plate ( Fig. 17 ); distal half narrowing towards apex; U-shaped incision separating pointed lateral lobes. Inferior appendages fused basally in short, irregular, compressed central plate ( Fig. 16 ); each appendage with basal part very thick in lateral view; distal half forming narrow, dorsad-oriented lobe above segment X ( Fig. 17 ); each inferior appendage with irregular posterior margin covered by stout setae. Sclerotized portion of phallic apparatus long, nearly cylindrical in lateral view ( Fig. 19 ); in ventral view ( Fig. 20 ) with broad, nearly triangular phallobase; posterior part of phallotheca cylindrical; posteroventral margin of phallobase produced into long horizontal spine. Phallotremal sclerite complex with small, slender processes in lateral and ventral view; nearly U-shaped in ventral view; endotheca without micro-spines inside phallotheca; single, large and about 5 small endothecal spines present apically in retracted phallotheca.

Holotype male: Solomon Islands: 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].

Paratypes: Solomon Islands: 1 male, same data as holotype; 1 male, 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].

Etymology: Talinensis , from Talin River, 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 16 – 20. Chimarra talinensis, new species, holotype, male. 16 — genitalia, left lateral; 17 — genitalia, dorsal; 18 — genitalia, ventral; 19 — phallic apparatus, left lateral; 20 — phallic apparatus, ventral.

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.