Labiobaetis, Novikova & Kluge, 1987

Kaltenbach, Thomas & Gattolliat, Jean-Luc, 2021, Labiobaetis Novikova & Kluge in West Africa (Ephemeroptera, Baetidae), with description of a new species, African Invertebrates 62 (1), pp. 355-382 : 370

Key to the Labiobaetis species of West Africa (nymphs)

1	With six pairs of gills	2
-	With seven pairs of gills	4
2	With distolateral process at scape; labrum rectangular; mandibles with incisor and kinetodontium apically cleft; glossae much shorter than paraglossae; paraproct with two or three spines (Fig. 8a-g )	L. elouardi
-	Without distolateral process at scape; labrum subrectangular; mandibles with incisor and kinetodontium fused; glossae somewhat shorter than paraglossae; paraproct with many spines	3
3	Labial palp segment II with broad thumb-like, distomedial protuberance (Fig. 2h )	L. vinosus
-	Labial palp segment II with narrow thumb-like, distomedial protuberance (Fig. 7h )	L. ediai sp. nov.
4	Labial palp segment II narrow thumb-like (Fig. 9b, d )	5
-	Labial palp segment II broad thumb-like (Fig. 2d, f )	6
5	Hind protoptera small (Fig. 9a ); labial palp segment III enlarged (Fig. 9b )	L. gambiae
-	Hind protoptera well developed (Fig. 9c ); labial palp segment III not enlarged (Fig. 9d )	L. piscis
6	Scape with distolateral process (Fig. 2g ); femoral patch at fore femur absent (Fig. 3c )	L. latus
-	Scape without distolateral process (Fig. 2e ); femoral patch at fore femur well developed (Fig. 3a, b )	7
7	Fore femur length 3.1-4.1 × maximal width, dorsally with row of 9-12 spine-like setae (Fig. 3a ); maxillary palp segment II with strongly developed, distolateral excavation, segment II 1.8-1.9 × length of segment I (Fig. 2a )	L. boussoulius
-	Fore femur length 2.7-3.2 × maximal width, dorsally with row of 13-18 spine-like setae (Fig. 3b ); maxillary palp segment II with distolateral excavation, segment II ca. 1.5 × length of segment I (Fig. 2b, c )	L. glaucus

Figures

Figure 2. Nymph morphology a Labiobaetis boussoulius, maxillary palps b-e Labiobaetis glaucus b, c maxillary palps d labial palp e base of antenna f, g Labiobaetis latus f labial palp g base of antenna h Labiobaetis vinosus, labial palp. Scale bar: 0.1 mm.

Figure 3. Nymph morphology, fore femur a Labiobaetis boussoulius b Labiobaetis glaucus c Labiobaetis latus. Scale bar: 0.1 mm.

Figure 7. Labiobaetis ediai sp. nov., nymph morphology a labrum b right mandible c right prostheca d left mandible e left prostheca f hypopharynx and superlinguae g maxilla h labium. Scale bar: 0.1 mm.

Figure 8. a-i Labiobaetis elouardi, nymph morphology a labrum b incisor and kinetodontium of right mandible c incisor and kinetodontium of left mandible d glossa and paraglossa e base of antenna f, g paraproct. SEM photos, Labrum, dorsal surface, right side, submarginal arc of setae (h section of figure i) j seta of submarginal arc on dorsal surface of labrum k usual type of feathered seta of submarginal arc on dorsal surface of labrum. Scale bar: 0.1 mm (h, i).

Figure 9. Nymph morphology a, b Labiobaetis gambiae a metanotum (left side), with small hind protopteron (mature nymph) b labial palp c, d Labiobaetis piscis c metanotum (left side), with well-developed hind protopteron (mature nymph) d labial palp. Scale bar: 0.1 mm.