Baetidae, Leach, 1815

Kaltenbach, Thomas, Mary, Nathalie & Gattolliat, Jean-Luc, 2021, The Baetidae (Ephemeroptera) of the Comoros and Mayotte, African Invertebrates 62 (2), pp. 427-463 : 427

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Key to the Baetidae species of the Comoros and Mayotte (nymphs)

1 Legs stocky with tibiae and tarsi almost fused, claws short and without denticles Potamocloeon (A.) freitagae
- Legs elongated with free tibiae and tarsi, claws with denticles 2
2 Claws elongated, with numerous denticles; at least part of the gills formed by two lamellae; abdominal segments VI-IX laterally with strong, apically pointed spines 3
- Claws not elongated, with less than 15 denticles; all gills formed by a single lamella; abdominal segments VI-IX laterally without spines 4
3 Upper lamella of gills rounded, almost as developed as lower one Cloeon smaeleni
- Upper lamella of gills elongated, sometimes as long as lower one, but much narrower Procloeon (O.) cylindroculum
4 Antennae close to each other with small carina in between; posterior margin of tergite IV with discontinuous row of few reduced, triangular spines (Fig. 12d View Figure 12 ) Nigrobaetis richardi sp. nov.
- Antennae without carina in between; posterior margin of tergite IV with continuous row of triangular spines 5
5 Labial palp segment II with large distomedial protuberance; maxillary palp segment II with distolateral excavation; mandibles without setae between prostheca and mola; fore tibia with patellotibial suture ( Labiobaetis ) 6
- Labial palp segment II without distomedial protuberance; maxillary palp segment II without excavation; at least right mandible with setae between prostheca and mola; fore tibia without patellotibial suture (Protopatellata) 7
6 Seven pairs of gills; hind protoptera well developed Labiobaetis glaucus
- Six pairs of gills; hind protoptera absent or vestigial Labiobaetis vinosus
7 Incisor of both mandibles blade-like, kinetodontium with denticles (Fig. 6b, d View Figure 6 ); tibia with an arc of long, fine, simple setae (Fig. 7a View Figure 7 ); claw with one row of denticles, without subapical setae (Fig. 7b View Figure 7 ) Dabulamanzia mayottensis sp. nov.
- Incisor and kinetodontium of both mandibles with denticles (Fig. 3b, d View Figure 3 ); tibia without arc of fine, simple setae; claw with two rows of denticles and a pair of subapical setae (Fig. 4a, b View Figure 4 ) Afroptilum bicorne