Chimarra talinensis 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 talinensis

description: 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.
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 30-31, DOI: 10.5281/zenodo.198496