Crassabwa ameliae

Kluge, Nikita J., Gattolliat, Jean-Luc & Salles, Frederico F., 2017, Redescription of the Afrotropical genus Crassabwa Lugo-Ortiz & McCafferty 1996 (Ephemeroptera: Baetidae: Protopatellata), Zootaxa 4350 (3), pp. 401-435: 428-432

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Crassabwa ameliae


Crassabwa ameliae  sp.n.

( Figs 114–132View FIGURES 114 – 118View FIGURES 119 – 124View FIGURES 125 – 132)

Etymology. This species is dedicated to Amélie Gattolliat, daughter of the second author.

Material examined. Holotype: L/S ♂, ZAMBIA, Lwakela river 22 km N Mwinilunga, 18–21.VIII.2014, 11°32'S / 24°25'E, coll. N. Kluge and L. Sheyko ( ZIN)GoogleMaps  . Paratypes: the same locality and date as holotype, 4 larvae ( ZIN)GoogleMaps  ; West Lunga river near Mwinilunga , 11°45'S / 24°26'E, 14–17.VIII.2014, coll. N. Kluge & L. Sheyko: 7 larvae ( ZIN). MALI: Koulikoro, Loc. TienfalaGoogleMaps  , Niger river , 20.III.1985, coll. J.- M. Elouard: 2 larvae ( MZL)  . GUINEA: Loc. Sassambaya , basin of Niger, Niandan river, 25.I.1985, coll. J.-M.. Elouard: 3 larvae ( MZL)  ; same data but 19.IV.1986: 3 larvae ( MZL)  .

Descriptions. Larva. CUTICULAR COLORATION. As characterized above [see Crassabwa  (1)]. Cuticle of fore protoptera in last larval instar with dark lines along all veins: convex longitudinal veins, concave longitudinal veins and cross veins ( Figs 114–116View FIGURES 114 – 118, 124View FIGURES 119 – 124); in previous larval instars, dark lines only along convex longitudinal veins ( Figs 117–118View FIGURES 114 – 118). Coloration of thorax and abdomen varies from nearly uniform ( Figs 116View FIGURES 114 – 118, 119View FIGURES 119 – 124) to light with very contrastingly darkened posterior part of mesonotum and abdominal terga III, VI and IX ( Figs 114–115View FIGURES 114 – 118).

HYPODERMAL COLORATION As characterized above [see Crassabwa  (2)], always without red coloration of proximal parts of cerci (see below) ( Fig. 121View FIGURES 119 – 124).

STRUCTURE. Head and mouth parts as characterized above [see Crassabwa  (3)–(10)]. Left mandible without setae between prostheca and mola; its mola proximad of distal molar projection forms 3 or 4 transverse ridges, which in dorsal or ventral view look as protuberances; fine molar processes do not form integral row, but are concentrated on tops of these protuberances ( Fig. 128View FIGURES 125 – 132). Right mandible with dense setae between prostheca and mola; its mola bears separate distal protuberance and 4 or 5 transverse ridges, which in dorsal or ventral view look as protuberances ( Fig. 127View FIGURES 125 – 132). Inner-apical projection of 2nd segment of labial palp large, nearly as large as 3rd segment ( Fig. 131View FIGURES 125 – 132).

Legs as characterized above [see Crassabwa  (12)–(16), (19)] ( Figs 122View FIGURES 119 – 124, 125View FIGURES 125 – 132). Fine colorless setae forming cross row near base of tibia and dispersed along posterior side of tibia and tarsus [see Crassabwa  (14)] simple (non-bifurcate). Claw relatively long, with distal portion (from distal denticle to apex) longer than remainder part (from base to distal denticle); denticles on claw equal in two rows [see Crassabwa  (19)]: two enlarged distal denticles in posterior row as large as two enlarged distal denticles in anterior row ( Fig. 126View FIGURES 125 – 132).

Abdomen as characterized above [see Crassabwa  (22)–(24)]; all scales of terga short (as in Fig. 94View FIGURES 84 – 95); sterna I – III without denticles, sternum IV with small denticles, sterna V –IX with regular row of pointed denticles (as in Fig. 104View FIGURES 104 – 107). Tergalius of first pair wide, asymmetric, with anal margin more convex than costal margin (as in Fig. 85View FIGURES 84 – 95); in last larval instar nearly half of tergalius is bent ventrally (as in Fig. 84View FIGURES 84 – 95) [see Crassabwa  (25)]. Tergalii II –V subequal (as in Figs 86–89View FIGURES 84 – 95), tergalii VI –VII gradually smaller, with anterior margin more convex (as in Figs 90– 91View FIGURES 84 – 95). Brown band on dorsal cuticle of tergalius [see Crassabwa  (26)] either poorly developed and invisible on background of main trachea, or absent. Tenth abdominal segment and caudalii as described above [see Crassabwa  (28), (29)] ( Fig. 119View FIGURES 119 – 124).

Winged stages. Unknown. Judging by male subimago extracted from mature larva, leg structure and subimaginal microlepides as characterized above [see Crassabwa  (17), (18)] ( Fig. 122View FIGURES 119 – 124). Judging by mature female larva with hypoderm started to get subimaginal shape, winged female also has shape of legs as characterized above [see Crassabwa  (17)]. Subimaginal hind wing, being extracted from larva and incompletely spread on slide in glycerine, has folds at base of costal projection ( Fig. 123View FIGURES 119 – 124), which testify that in spread condition its costal projection is long and directed perpendicular to the wing [see Crassabwa  (21)]. Abdominal terga of male with reddish coloration, sterna much lighter, without dark sigmoid maculae ( Fig. 120View FIGURES 119 – 124); cerci entirely light ocher, without red coloration ( Fig. 121View FIGURES 119 – 124).

Eggs. Unknown.

Dimension. Length of last instar larva 7–8 mm.

Comparison. Larva of the new species C. ameliae  sp. n. is very similar to C. ludmilae  sp.n., having the same unusual structure of mandibular mola, the same peculiar cuticular coloration of protoptera in last instar and the same structure of tergalii. Larva of C. ameliae  sp. n. differs from C. ludmilae  sp. n. by long claws and by absence of setae between prostheca and mola of left mandible. Judging by subimaginal parts extracted from mature larva, winged stages of C. ameliae  sp. n. differ from C. ludmilae  sp. n. and C. flava  by absence of red coloration at bases of cerci.


Russian Academy of Sciences, Zoological Institute, Zoological Museum


Musee Zoologique