Chimarra assambae, Gibon, 2015

Gibon, François-Marie, 2015, The Chimarra minima group in West Africa and Madagascar (Trichoptera, Philopotamidae), Zoosystema 37 (2), pp. 333-350 : 335-336

Chimarra assambae n. sp.

( Fig. 4 A-E)

TYPE MATERIAL. — Holotype: Cameroon, Assamba River (Sanaga bassin) near Ndjoré, 4°23’59”N, 11°49’11”E, 27.XII.1989, F.-M. Gibon, 1 ♂ (2 slides: genitalia / head and thorax) ( MNHN). Paratypes: Same data, 1 ♂ (ethanol), 1 ♂ (1 slide) ( CBGP).

TYPE LOCALITY. — Cameroon, Assamba River (Sanaga bassin) near Ndjoré, 4°23’59”N, 11°49’11”E.

DISTRIBUTION. — Cameroon. This species is only known from the type locality.

ETYMOLOGY. — Named after the Assamba River, tributary of the Sanaga.

DIAGNOSIS. — Chimarra assambae n. sp. belongs to subgroup 1, with a latero-ventral lobe sheet or leaf-shaped. It is distinguished from most other species ( C. bertrandi , C. loffae n. sp., C. lufirae , C. prodhoni Gibon, 1985 , C. sassandrae , C. toubaensis ) by the absence of the endothecal spine. It is distinguished from C. callasae and C. cereris , also devoid of an endothecal spine, by its ax-shaped latero-dorsal lobe (hook-shaped in the other species).

DESCRIPTION

Size: forewing 4.3 mm, hindwing 3.5 mm. Preanal appendages small, setose and oval in lateral view. Inferior appendages roughly quadrangular in lateral view, dorsal branch strong and long, ventral protruding process small. Latero-dorsal lobe of tergum X strong, distal part projected ventrad and extended in a characteristic ax-shaped extremity (dorsal view). Lateroventral lobe of tergum X plate like, long and relatively narrow. Lateral rods of Phallotheca long, thin, distally curved.Endotheca devoid of internal spine; phallotremal sclerite present, reduced.

Figures

FIG. 4. — Chimarra assambae n. sp.: A, segments IX and X, caudal view; B, segments IX and X, lateral view; C, segments IX and X, dorsal view; D, phallic apparatus, lateral view; E, inferior appendage, dorsal view. Abbreviations: ai, inferior appendage; db, dorsal branch; ib, inferior branch; pa, preanal appendage, sg, abdominal segment; t, tergite; vb, ventral branch. Scale bar: 0.1 mm.