Chimarra babarensis, 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 : 34-36

Chimarra babarensis , new species

Figs 6 , 31–35

Diagnosis: This species has a unique genitalic morphology, involving a combination of tergum X located nearly as low as mid-height on genitalia, and very long inferior appendages with the distal half very slender and bent mesally and crossing each other above tergum X. In addition, the phallic apparatus includes a single, large endothecal spine, and the posteroventral part of the phallotheca forms an acutely narrowed, ventral projection.

Description: Wings ( Fig. 5 ): Forewings each 4.0 mm long, membrane pale grey, except brownish at basal half and along anterior margin; veins dark brown. Hind wings each 3.3 mm long, membrane uniformly grey; veins brown.

Male Genitalia ( Figs 31–35 ): Segment IX rather short, each side with anteroventral part ellipsoid in lateral view ( Fig. 31 ); each anterodorsal margin concave, rounded; ventral margin slightly convex and angled in lateral view, without ventral process; each posterior margin shallowly concave, with small outgrowth between inferior appendage and preanal appendage; few setae restricted to posterior margin below preanal appendages; in ventral view ( Fig. 33 ) widening posteriorly, with convex lateral margins and widely and deeply concave posterior margin; anterior margin with shallow, triangular incision; in dorsal view ( Fig. 32 ) with narrowing lateral margins, each lateral margin with minute rectangular anterior apex; tergite anteriorly concave, widely U-shaped. Tergite IX short, without process near basis of tergum X. Anterior apodemes absent. Preanal appendages located well below dorsal margin of segment IX ( Fig. 31 ), dorsally and basally on tergum X, about 0.05 mm long, directed posterad; smoothly rounded in lateral view ( Fig. 31 ), narrower in dorsal view ( Fig. 32 ). Tergum X about half as long as inferior appendages, without setae, originating shortly above midheight of segment IX; formed by pair of posteroventrad-oriented, sharply tapering lateral lobes ( Fig. 31 ), widely separated at base of tergum X in dorsal view ( Fig. 32 ); in dorsal view each lateral lobe running parallel; each lateral lobe with rounded lateral process with 2 apical sensillae; apex of each lateral lobe dilated, smooth. Inferior appendages with compact, short central plate ( Fig. 31 ); basal half of each inferior appendage nearly straight, slightly narrowing; strongly bending mesad from mid-length, distal half tapering along its length, the 2 inferior appendages usually crossing above tergum X; in ventral view ( Fig. 33 ) each inferior appendage with narrow mesobasal plate with irregular mesal margin. Sclerotized portion of phallic apparatus long, slender, phallotheca nearly cylindrical from half its length in lateral view, and along its length in ventral view ( Figs 34, 35 ); phallobase about as thick as rest of phallotheca in lateral and ventral views ( Figs 34, 35 ); posteroventral margin of phallotheca strongly produced into slender horizontal spine in lateral view ( Fig. 34 ), this spine sharp and triangular in ventral view ( Fig. 35 ). Phallotremal sclerite complex with single, nearly vertical plate in lateral view; in ventral view ( Fig. 35 ) forming broad oblong plate with ray along each lateral margin; minute spines absent; single long, straight, posterad-oriented endothecal spine present immediately after phallotremal sclerite complex in retracted phallotheca.

Holotype male: Solomon Islands: Western Province, Kolombangara Island, Babare River, 1 km W main road between roads L5 and L6, loc 0 9, light trap, 13.i.2008 [M Espeland].

Etymology. Babarensis , from Babare 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 31 – 35. Chimarra babarensis, new species, holotype, male. 31 — genitalia, left lateral; 32 — genitalia, dorsal; 33 — genitalia, ventral; 34 — phallic apparatus, left lateral; 35 — phallic apparatus, ventral.