Chimarra devoensis, Johanson, Kjell Arne & Oláh, János, 2012

Johanson, Kjell Arne & Oláh, János, 2012, Revision of the Fijian Chimarra (Trichoptera, Philopotamidae) with description of 24 new species, Zootaxa 3354, pp. 1-58 : 46-47

Chimarra devoensis , new species

Figs. 26 , 139–144

The male genitalia of this species resemble those of C. lavensis and C. vanuensis , particularly in the presence of a strongly dorsad-oriented dorsal branch of tergum X. In C. devoensis the dorsal process of tergum X is accompanied by a triangular, posterad oriented process between on the dorsal branches of tergum X. Segment IX has very long, anterolateral plates that are shorter in C. lavensis and C. vanuensis . In addition, the base of each gonopod is more strongly expanded ventrad compared to the other species. The species is easily distinguished from C. vanuensis by the absence of a large pale spot between Cu1 and end of Cu2 (arculus) in each forewing.

Male. Head and thorax greyish brown, dorsal part of meso- and metathorax dark brown. Foreleg anterior claw as long as foreleg spur.

Wings ( Fig. 26 ). Forewings 5.1 mm (n=1), brown. Forewings broad, ratio of length to breadth 3.2; R1 nearly straight before crossvein r; radial sector slightly 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 originating from basis of fork I; fork I originating before crossvein s at distance equal to length of crossvein s; nygma located near base of fork II; fork III 1 /6th as long as wing; fork V shorter than fork II; Cu2 ending in wing margin well separated from A. Hind wings 4.2 mm (n=1), brown; ratio of length to breadth 3.0; margin weakly incurved where Cu1 and Cu2 fused with margin; fork I originating slightly before anterodistal corner of discoidal cell; fork III as long as discoidal cell and1/10th as long as wing; fork V slightly shorter than fork I; 1A+2Ab 3x as long as 1A.

Male genitalia ( Figs. 139–144 ). Segment IX about 1.5x taller than long in lateral view; anterodorsally produced into long, narrow, rounded, anterodorsad oriented plate; anteroventral plate large, triangular, pointing posterad in lateral view; anterodorsal margin widely and deeply concave, U-shaped; ventral margin irregularly convex, incised at vertical apodeme; each posterior margin forming uniformly convex plate originating immediately below cercus; segment IX ventrally with setae restricted to narrow band before posterior margin ( Fig. 141 ). Dorsal margin of segment IX undulating in lateral view; anterior margin straight, membranous in dorsal view. In ventral view segment IX with almost parallel lateral margins, slightly narrower at transverse apodeme; anterior margin concave; posterior margin straight, without central projection. Tergum X nearly as long as segment IX, divided into pair of lateral branches at basis; in lateral view each lateral branch with large, straight, dorsad oriented dorsal branch, short, widely triangular posterad orienting process below dorsal branch, and long tube-shaped, nearly straight ventral branch with 2 apical sensillae. In dorsal and ventral view, ventral processes oriented posterad, slightly diverging, tapering along their length. Cerci small, wart-like, located at posterior margin of segment IX at mid-height of tergum X and covered by long setae. Gonopods longer than length of segment IX; divided into very broad basal third and narrow distal 2/3rds in lateral view; distal 2/3rds nearly parallel-sided; each gonopod unbranched in lateral view; with well-developed dorsomesal lobe and ventromesal lobe of mesal process in ventral view. Anterodorsal margin of each gonopod basally convex, distally straight; posteroventral margin concave, with strongly expanded setal bases; ventral margin of basis strongly expanded ventrad; distal apex without megasetae. In ventral view, gonopods slightly broader at base than rest of gonopods, with undulating margins; gonopods weakly curved mesad along their length. Mesal branch of each gonopod divided into well-developed ventromesal and dorsomesal lobe; ventromesal lobe strongly produced dorsad, darkly pigmented, covered by minute setae; dorsomesal lobe curved ventrad, with pointed apex. Phallic apparatus slightly longer than rest of genitalia, straight along its length; phallotheca, in lateral view nearly 4x thicker than posterior part; in ventral view nearly 2x thicker than posterior part; apicoventral spine absent; phallotremal sclerite forming simple, 3-rayed structure in lateral view; in ventral view forming single posterad directed arrow head situated on basis with 4 anterad pointing spines; 4 nearly black, short, variously directed endothecal spines present, about as long as diameter of narrowest part of phallotheca; endothecal spicules pointing posterodorsad, present in group below phallotremal sclerite.

Female. Unknown.

Holotype male: TAVEUNI: Cakadrove Prov., Devo Peak, Malaise trap, 10–16.i.2003, leg. M. Irwin, E. Schlinger & M. Tokota’a [loc#37] [ FNIC].

Etymology: Devoensis , after Devo Peak, the type locality of the species.

Distribution: Taveuni.

Figures

FIGURES 22 – 29. Right wings, dorsal views. 22 — C. cartwrighti, new species, holotype; 23 — C. kimminsi, new species, holotype; 24 — C. kadavuensis, new species, holotype; 25 — C. lavensis, new species, holotype; 26 — C. devoensis, new species, holotype; 27 — C. helomyzida, new species, holotype; 28 — C. tipulida, new species, holotype; 29 — C. psychodida, new species, holotype.

FIGURES 139 – 144. Chimarra devoensis, new species, holotype. 139 — genitalia, left lateral view; 140 — genitalia, dorsal view; 141 — genitalia, ventral view; 142 — left gonopod, caudal view; 143 — phallic apparatus, left lateral view; 144 — phallic apparatus, ventral view.