Chimarra gensonae, 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 : 15-16

Chimarra gensonae sp. nov.

urn:lsid:zoobank.org:act:D0D40DA2-B53D-4699-812D-A4BA6B5C80EF

Figs 8 , 18

Diagnosis

Chimarra gensonae sp. nov. is closely related to C. tamara sp. nov. When viewed laterally, their tergum X are very similar, characterized by a thick and short dorsal branch and a thin ventral branch ( Figs 8A , 14A ). The two species differ by the phallotheca, short and stout in C. gensonae sp. nov. ( Fig. 8 D–E), long and slim in C. tamara sp. nov. ( Fig. 14 D–E).

Etymology

It is a pleasure to dedicate this species to my colleague Gwenaelle Genson in recognition of her efforts for the barcoding of caddisflies.

Type material

Holotype

MADAGASCAR: ♂, mounted on 2 slides, remaining parts in alcohol, Tamara River , 4 km from Ranomafana, 21°14′45″, 47°25′37″ E, 850 m, 24 May 1995.

Paratypes

MADAGASCAR: 3 ♂♂, same data as holotype, in alcohol; 1 ♂, Ambatoharanana River near Ranomafana, 21°15′15″ S, 47°27′34″ E, 850 m, 23 May 1995.

Other specimens

MADAGASCAR: 1 ♂, mounted on 3 slides, remaining parts in alcohol, Ranomafana National Park, tributary of the Namorona, 21°15′50″ S, 47°25′15″ E, 1230 m, 7 Nov. 1996.

Description

SIZE. Forewing 7.6 mm, hind wing 6.0 mm.

TERGUM X. Dorsal branch wide and short, thumb-shaped when viewed laterally, toward the apex a small protuberance with two sensillae; ventral branch thin as long as dorsal branch; dorsal and ventral branches forming an angle of 65°.

INFERIOR APPENDAGES. Roughly triangular, anterior margin almost twice as long as ventral margin; dorsal part curved distad, inner lobe long, thin, slightly protruding.

PHALLIC APPARATUS. Short compared to other species of the group. Phallotheca split nearly from the base; ventral lamina as long as dorsal lamina, thinner and digitiform; when viewed dorsally, dorsal lamina with a lateral fold and a sudden narrowing after mid-length ( Fig. 8D ); internal sclerite short, stout,

bullet-shaped ( Fig. 8E ); phallotremal sclerite including an ovoid basal part, a thin spine and a pair of hooks.

Distribution

Madagascar (endemic), Ranomafana National Park and surroundings areas.

Figures

Fig. 8. Chimarra gensonae sp. nov. A–B. Abdominal segments IX and X. A. Lateral view. B. Dorsal view. C. Inferior appendages, dorsal view. D–E. Phallic apparatus. D. Dorsal view. E. Lateral view. Scale bar = 0.5 mm.

Fig. 18. Chimarra makiorum sp. nov., Chimarra gensonae sp. nov. and Chimarra jejyorum sp. nov., schematic distribution map and ecological profile of the capture sites in Madagascar.

Fig. 14. Chimarra tamara 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.