Procloeon (Oculogaster) cylindroculum Kimmins, 1956

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

8. Procloeon (Oculogaster) cylindroculum Kimmins, 1956

Procloeon (O.) cylindroculum : Kluge 2016: figs 1-29.

Diagnosis.

Nymph. Following combination of characters: A) maxillary palp 2-segmented; B) labial palp with enlarged, falcate segment III; C) claw elongate, with two rows of denticles, minute in proximal part and larger in proxomedial part; D) hind protoptera absent; E) seven pairs of gills, gills I-V or I-VI with two lamellae, upper lamella much narrower than lower one; F) laterally strong, pointed spines at least on abdominal segments V-IX; G) paracercus subequal to cerci.

Distribution

(Fig. 13 ). Gambia, Ghana, Mali, South Africa, Tanzania, Uganda, Zambia, Zimbabwe ( Kluge 2020, 2021).

Biological aspects.

In the Comoros, the specimens were collected at altitudes of 150 m and 750 m, partly together with A. bicorne . The characteristics and environmental conditions of the sampling sites (Anjouan, Riv. Foumbani, Riv. Santsa) are described in Starmühlner (1979: pp. 651, 656): river width 0.5-2 m, depth 1-10 cm, water temperature 24 °C-26 °C, bottom substrata consisted of basaltic rock, boulders, stones, gravel and sand. In Mayotte, the specimens were collected at an altitude of 30 m, together with D. mayottensis sp. nov. and L. glaucus .

Material examined.

Comoros • 2 nymphs; Anjouan, Riv. Foumbani, Foumbani , near Sima; 150 m; 26.03.1974; leg. F. Starmühlner; 1 on slide; GBFCH00592756 ; 1 in alcohol; GBIFCH00515657 ; MZL • 2 nymphs; Anjouan, Riv. Santsa, upper course, near Adda-Douéni; 750 m; 21.03.1974; leg. F. Starmühlner; 1 on slide; GBIFCH00592755; 1 in alcohol; GBIFCH00515658; FAMU . Mayotte • 1 nymph; Riv. Longoni, Loc. Longoni aval ; 12°44'20"S, 45°09'53"E; 30 m; 14.05.2006; leg. N. Mary; on slide; GBIFCH00592750 ; MZL • 2 nymphs; Riv. Longoni, Loc. Longoni aval ; 12°44'20"S, 45°09'53"E; 30 m; 16.04.2009; leg. N. Mary; 1 on slide; GBIFCH00592717 ; 1 in alcohol; GBIFCH00515725 ; MZL .

Figures

Figure 13. Distribution of Nigrobaetis richardi sp. nov., Potamocloeon (A.) freitagae and Procloeon (O.) cylindroculum in the Comoros Archipelago.