Chimarra nathani Johanson & Oláh, 2012, new species
Creators: name: Johanson, Kjell Arne
name: Oláh, János
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Philopotamidae
Chimarra
Chimarra nathani

description: Chimarra nathani, new species
Figs. 10, 55–59
Chimarra nathani has a large pale, hyaline spot on both wing pairs, like C. signata, C. schlingeri, C. braueri and C. vitiensis. It is easily distinguished from those species by the genitalia of the male. The gonopods each have a dorsal branch that appears as a small but distinct, triangular projection in lateral view, but in dorsal and ventral views this branch is seen to form a large, rectangular plate below the phallus.
Male. Head and thorax pale yellowish-brown. Area between ocelli yellowish-brown. Foreleg anterior claw as long as foreleg spur.
Wings (Fig. 10). Forewings 6.9 mm (n=1), brown; large pale, hyaline, nearly circular spot occupying central part of wing, including median cell and basal third of discoidal cell. Forewings broad, ratio of length to breadth 3.3; R1 nearly straight before crossvein r; radial sector strongly produced anterad immediately before discoidal cell; discoidal cell originating at mid-length of wing, nearly 3x longer than wide; median cell as long as discoidal cell; crossvein r fusing with basis of fork I; fork I originating before crossvein s at distance nearly equal to length of crossvein s; nygma located near base of fork II; fork III 1 /6th as long as wing; fork V about as long as fork II; Cu2 ending in wing margin close to A. Hind wings 5.6 mm (n=1), brown, with large, oval, pale hyaline spot centrally on anterior 1/2 of wings, occupying basal 1/2 of discoidal cell; broad, ratio of length to breadth 3.2; margin slightly incurved at arculus, where Cu1 and Cu2 fused with margin; fork III as long as discoidal cell and 1/9 as long as wing; fork V about as long as fork I; 1A+2A nearly as long as 1A.
Male genitalia (Figs. 55–59). Segment IX slightly longer than high; anterodorsal margins strongly concave in lateral view; ventral margins uniformly convex; each posterior margin produced posterad into narrow plate well below each cercus; ventral side of posterior 1/2 of segment IX densely covered by setae (Fig. 57). In dorsal view with pointed anterior lobes; anterodorsal margin with wide, shallow incision in dorsal view. In ventral view segment IX with concave anterior margin and very slightly concave posterior margin; posterior margin without central projection. Tergum X simple; slightly tapering till distal 3/ 4 in lateral view (Fig. 55); distal1/4 expanded dorsad into nearly triangular process; in dorsal view divided at mid-length into 2 parallel lateral branches (Fig. 56); each lateral branch nearly parallel-sided in dorsal and ventral view, apically nearly truncate, with strongly laterad-producing apicolateral corner; pair of sensillae located at mid-length of each lateral branch. Cerci slender in lateral view, located dorsally on segment IX and oriented slightly dorsad in lateral view and oriented posterad in dorsal view; covered by long setae. Gonopods shorter than segment IX, nearly quadrangular in lateral view; anterodorsal margin slightly concave; ventral margin nearly straight, undulating; dorsal branch forming strong, triangular process in lateral view, in dorsal and ventral view forming long, broad, nearly horizontal plates oriented postero mesad; ventral branch broad, posteriorly rounded in lateral view; in ventral view produced into nearly rectangular, darkly pigmented mesal plates; each mesal plate margin undulating. Mesal process situated centrally on gonopods, strongly sclerotized, slightly curved mesad. Phallic apparatus about as long as rest of genitalia; phallotheca, in lateral and ventral view, with anterior part 2x thicker than posterior part; apicoventral spine absent; phallotremal sclerite not observed; pair of nearly black, posterad directed, sub-equally large endothecal spines present, slightly longer than diameter of narrowest part of phallotheca.
Female. Unknown.
Holotype male: VITI LEVU: Naitasiri Prov., 3.3 km N Veisari, logging rd. to Waivudava, Malaise trap, 8–31.iii.2003, 18.0592°S, 178.367°E, 300 m, leg. M. Tokota’a [loc#20] [FNIC].
Paratype: VITI LEVU: Naitasiri Prov., 4 km WSW Colo-i-Suva Vlg., Mt. Nakobalevu, Malaise trap, 24.iv–12.v.2004, 18.055°S, 178.424°E, 372 m, leg E. Schlinger & M. Tokota’a [loc#11] — 1 male [NHRS, DNA voucher IL 9].
Etymology: Nathani, named after Nathan Banks who described several Chimarra from Fiji. Distribution: Viti Levu.
description: Published as part of Johanson, Kjell Arne & Oláh, János, 2012, Revision of the Fijian Chimarra (Trichoptera, Philopotamidae) with description of 24 new species, pp. 1-58 in Zootaxa 3354 on pages 20-22, DOI: 10.5281/zenodo.210736