Chimarra hamatra, Ird & Inra, 2017

Gibon, François-Marie, 2017, The Chimarra lehibemavo species-group, new and endemic to Madagascar (Trichoptera, Philopotamidae), European Journal of Taxonomy 319, pp. 1-31 : 19-20

Chimarra hamatra sp. nov.

urn:lsid:zoobank.org:act:EA3CF81A-84AF-4AF0-8997-F48E8E00ADB4

Figs 10 , 17

Diagnosis

The closest species to C. hamatra sp. nov. is C. makiorum sp. nov. The tergum X of these two species are relatively small (as in C. jejyorum sp. nov. and in C. gattolliati sp. nov.) but, their inferior appendages are roughly rectangular and not triangular or L-shaped as in all the other species of the group. Moreover, these appendages have a distinct and heavily sclerotized supplementary branch on the distal edge. This branch is inserted at mid-height in C. hamatra sp. nov. ( Fig. 10A ), whereas almost apically in C. makiorum sp. nov. ( Fig. 11A ).

Etymology

The name is a Malagasy adjective that means ‘uncommon’.

Type material

Holotype

MADAGASCAR: ♂, mounted on three slides, tributary of the Sahatandra River , near Moramanga, 18°56′27″ S, 48°29′12″ E, 800 m, 28 Apr. 1998, leg. J.-M. Elouard.

Description

SIZE. Forewing 7.1 mm, hind wing 5.6 mm.

TERGUM X. Lateral lobe reduced; dorsal branch straight (lateral view), relatively short with, at midlength, a small lateral bump bearing two sensillae; ventral branch short and thin.

INFERIOR APPENDAGES. Wide, roughly rectangular in lateral view; ventral branch weakly developed; median branch protruding, inserted on distal edge (lateral view), making the apex claw-shaped on dorsal view ( Fig. 10C ).

PHALLIC APPARATUS. Long, distal half of the phallotheca poorly sclerotized with the exception of a strip terminated by a triangular tip; internal sclerite long, with a basal triangular extension and curved apex; phallotremal sclerite relatively small, ending in a pair of hooks.

Distribution

Madagascar (Moramanga area).

Figures

Fig. 10. Chimarra hamatra sp. nov. A–B. Abdominal segments IX and X. A. Lateral view with ventral margin of sternite VIII. B. Dorsal view. C. Inferior appendage, dorsal view. D–E. Phallic apparatus. D. Dorsal view. E. Lateral view. Scale bar = 0.5 mm.

Fig. 17. Chimarra fotobohitra sp. nov., Chimarra saha sp. nov., Chimarra hamatra sp. nov., Chimarra moramanga sp. nov. and Chimarra cebegepi sp. nov., schematic distribution map and ecological profile of the capture sites in Madagascar.

Fig. 11. Chimarra makiorum sp. nov. A–B. Abdominal segments IX and X. A. Lateral view with ventral margin of sternite VIII. B. Dorsal view (partim). C. Inferior appendage, dorsal view. D–E. Phallic apparatus. D. Dorsal view. E. Lateral view. Scale bar = 0.5 mm.