1 . Labiobaetis boussoulius (Gillies, 1993)

Labiobaetis boussoulius: Gillies 1993: figs 4-12 ( Baetis boussoulius)

Differential diagnoses.

Nymph. Following combination of characters: A) scape without distolateral process; B) labial palp segment II with broad, thumb-like distomedial protuberance; C) maxillary palp segment II with strongly developed excavation at inner distolateral margin, segment II 1.8-1.9 × length of segment I (Fig. 2a); D) fore femur mostly rather slender, length 3.1-4.1 × maximum width; dorsal margin with 9-12 spine-like setae; femoral patch well developed (Fig. 3a); E) hind protoptera well developed; F) seven pairs of gills.

Material examined.

Holotype. Guinea • Exuviae and male imago; Milo River, Boussoule; 13.02.1986; leg. M.T. Gillies and J.-M. Elouard; on slides; NHM10017042, NHM10017043; NHM . Other material. Guinea • 4 nymphs; same data as holotype; on slides; NHM10017044, NHM10017045, NHM10017046, NHM10017047; NHM • 7 nymphs, 3 imagos; Milo River, Boussoule; 22.12.1984; 2 nymphs on slides; GBIFCH00592438, GBIFCH00592763; 5 nymphs, 3 imagos in alcohol; GBIFCH00515625; MZL .

Distribution.

Guinea (Fig. 4a).