The Chimarra lehibemavo species-group, new and endemic to Madagascar (Trichoptera, Philopotamidae) Author Gibon, François-Marie text European Journal of Taxonomy 2017 2017-05-18 319 1 31 journal article 22104 10.5852/ejt.2017.319 e352bb73-0c07-4e6d-af55-f369bdab1aab 2118-9773 3829226 256407D2-64CC-4B3C-8C24-FA7C8CBF50B2 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 ). 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. 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).