Chimarra forcellinii, 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 : 10-11

Chimarra forcellinii sp. nov.

urn:lsid:zoobank.org:act:656986B7-7CBD-45A3-B73D-6C12058B2079

Figs 5 , 16

Diagnosis

Chimarra forcellinii sp. nov. is a close relative of C. fenoevo sp. nov. These two species differ by the shape of the inferior appendages (lateral view), L-shaped in C. forcellinii sp. nov. ( Fig. 5A ), whereas triangular in C. fenoevo sp. nov. ( Fig. 4A ). Another useful diagnostic character is the maximum width of the phallotheca: that is at the apex in C. fenoevo sp. nov. ( Fig. 4D ), whereas in C. forcellinii sp. nov. it is in the middle of the tubular part ( Fig. 5D ).

Etymology

This species is dedicated to Maxence Forcellini in tribute to his work for the aquatic biomonitoring of La Réunion.

Type material

Holotype

MADAGASCAR: ♂, Sahatandra River near Ambodiriana, 19°01′32″ S, 48°20′28″ E, 980 m, 4 Apr. 1992, leg. J.-M. Elouard.

Description

SIZE. Forewing 6.3 mm, hind wing 5.3 mm. TERGUM X. Both dorsal and ventral branches elongated, ventral branch almost straight, dorsal branch slightly and regularly curved ventrad in lateral view, strongly angled inward in dorsal view ( Fig. 5B ).

INFERIOR APPENDAGES. L-shaped (lateral view), anterior branch twice as long as ventral one, distal margin sinuous.

PHALLIC APPARATUS. Ventral lamina shorter than dorsal lamina, digitiform (dorsal view); dorsal lamina with prominent median bulge and straight distal edge ( Fig. 5D ); internal sclerite strong and globular; phallotremal sclerite well developed including an indistinct dorsal element ( Fig. 5E ) and a broad plate ending in two hooks ( Fig. 5D ).

Distribution

Madagascar (endemic), Rianila River basin.

Figures

Fig. 5. Chimarra forcellinii sp. nov. A–B. Abdominal segments IX and X. A. Lateral view. B. Dorsal view. C. Inferior appendage, dorsal view. D–E. Apex of the phallic apparatus. D. Dorsal view. E. Lateral view. Scale bar = 0.5 mm.

Fig. 16. Chimarra lehibemavo sp. nov., Chimarra tamara sp. nov., Chimarra gattolliati sp. nov. and Chimarra forcellinii sp. nov., schematic distribution map and ecological profile of the capture sites in Madagascar.

Fig. 4. Chimarra fenoevo sp. nov. A–B. Abdominal segments IX and X. A. Lateral view. B. Dorsal view. C. Inferior appendage, dorsal view. D–E. Phallic apparatus. D. Dorsal view. E. Lateral view. Scale bar = 0.5 mm.