Potamocloeon Gillies 1990

Kluge, Nikita J., 2019, Potamocloeon edentatum sp. n. from Usambara Mountains in Tanzania (Ephemeroptera, Baetidae), Zootaxa 4648 (2), pp. 299-317 : 300-302

Potamocloeon Gillies 1990

( Figs 1–76 )

Genus Potamocloeon Gillies 1990b: 207 (imago, non larva; type species Cloeon dentatum Kimmins 1956 ); Lugo-Ortiz & Mc- Cafferty 1996 (imago, non larva).

Genus Maliqua Lugo-Ortiz & McCafferty 1997: 368 (larva and imago; type species Afroptilum plumosum Wuillot, in Wuillot & Gillies 1993 ); synonymized with Potamocloeon by Kluge (2018: 117).

Part of genus Cloeodes (= Potamocloeon = Maliqua ): Jacobus, McCafferty & Gattolliat 2006: 131.

Genus Potamocloeon: Salles & Gattolliat & Sartori 2016: 108 (larva and imago).

Type species: Cloeon dentatum Kimmins 1956 .

Species composition of Potamocloeon . This genus contains African species originally described under the names dentatum Kimmins 1956 [ Cloeon ], plumosum Wuillot (in Wuillot & Gillies) 1993 [ Afroptilum ], abdallahi McCafferty 2000 [ Maliqua ] and the new species described in this paper.

The species names dentatum [ Cloeon ], plumosum [ Afroptilum ] and abdallahi [ Maliqua ] are regarded as subjective synonyms ( Jacobus et al. 2006). Wuillot and Gillies (1993) did not originally compare Afroptilum plumosum with Cloeon dentatum ; male imagines of these forms have identical structure of genitals, that testifies that they really belong to one and the same species. Maliqua abdallahi McCafferty 2000 was originally described as larvae and compared with the larval description of Afroptilum plumosum ; most of the reported differences between these two species are inconsistent. However, it is possible that Potamocloeon abdallahi (McCafferty 2000) is a valid species characterized by colorless tracheae of tergalii, while Potamocloeon dentatum (= plumosum ) and the new species P. edentatum sp n. have well pigmented tracheae. The validity of P. abdallahi is questionable, while its imago is unknown.

In addition to these continental African species, four species were described from Madagascar and originally placed in the genus Cloeodes : portabilis Lugo-Ortiz et al. 1999 [ Cloeodes ], bicoloratus Gattolliat 2001 [ Cloeodes ], freitagae Gattolliat 2001 [ Cloeodes ], pseudogladius Gattolliat 2001 [ Cloeodes ]. Salles et al. (2016) placed them in the genus Potamocloeon as a separate subgenus Aquaediva Salles, Gattolliat & Sartori 2016.

Figures

FIGURES 1–10. Potamocloeon dentatum. 1, head and thorax of male imago from Uganda; 2, its abdominal sterna and terga; 3, abdominal sterna and terga of male imago from Mali; 4, abdominal sterna and terga of male subimago from Uganda; 5, hind leg of male imago; 6, subimaginal mesonotum; 7–10, genitals: 7, holotype; 8–9, specimens from Mali; 10, specimen from Uganda.

FIGURES 11–13. 11–12, Potamocloeon dentatum: 11, genitals of subimago; 12, genitals of imago (styligeral and gonostylar muscles shown only on left side, gonoduct shown by dotted line). 13, Potamocloeon edentatum sp. n., fore wing (holotype). Abbreviations: gd – gonoduct; gs1–gs3, segments of gonostylus; m.IX-X, areas of anterior attachment of median paraproctal muscles (i.e., muscles going from sternum IX to common base of paraprocts); m.sg, median sterno-styligeral muscle.

FIGURES 14–23. Larvae of Potamocloeon edentatum sp. n. 14, male larva of last instar with well-developed cuticular coloration; 15, female larva of penultimate instar with light cuticle and well-visible hypodermal coloration; 16, exuviae of fore leg with prothoracic pleurite; 17, exuviae of middle leg; 18, exuviae of hind leg with metathoracic pleurite and part of metanotum (arrow shows vestige of hind protopteron); 19, exuviae of abdomen; 20, exuviae of right half of pronotum and mesonotum; 21, head; 22, portion of cercus and paracercus in middle part; 23, apices of cercus and paracercus.

FIGURES 24–27. Larvae of Potamocloeon edentatum sp. n. 24, maxilla (ventral view); 25, left half of labrum (dorsal view); 26–27, apices of left and right mandibles before molt to next larval instar. Abbreviations: ds1–ds3, dentisetae.

FIGURES 28–36. Larvae of Potamocloeon edentatum sp. n. 28, 29, tergalii of 1st pair; 30–35, tergalii of 2nd–7th pairs; 36, labium (at left ventral view and musculature, at right dorsal view).

FIGURES 37–44. Larvae of Potamocloeon edentatum sp. n. 37, fore leg (dorsal view); 38, articulation of femur and tibia of middle leg (dorsal view); 39, fragment of fore tarsus (ventral view); 40, fragment of middle tarsus (ventral view); 41–42, claws; 43, exuviae of paraprocts and protogonostyli of male larva; 44, exuviae of 9th and 10th terga.

FIGURES 45–51. Larval legs of Potamocloeon edentatum sp. n. (instead of long hairs, only their bases are shown as small rings). 45, fore femur (dorsal view); 46, middle femur (dorsal view); 47, fore tibia (anterior view); 48, middle tibia (anterior view); 49, hind tibia (anterior view); 50, fore tarsus (dorsal view), 51, middle tarsus (dorsal view).

FIGURES 52–55. Larval abdominal sterna of Potamocloeon edentatum sp. n. 52, halves of abdominal sterna II–VIII; 53, frag- ment of sternum III; 54, fragment of sternum V; 55, fragment of sternum VII.

FIGURES 56–62. Potamocloeon edentatum sp. n. 56, abdominal terga of male imago; 57–59, male imagines; 60, abdominal sterna of male imago; 61–62, female imago (56, 60, holotype).

FIGURES 63–69. Potamocloeon edentatum sp. n. 63, subimaginal exuviae of tibia and tarsus of female fore leg; 64, the same, hind leg; 65, its imaginal hind leg; 66, subimaginal exuviae of mesopleuron; 67, subimaginal exuviae of left half of mesonotum; 68–69, genitals of male imagines (66–68, holotype).

FIGURES 70–72. Potamocloeon edentatum sp. n. 70, subimaginal exuviae of gonostyli; 71, genitals of male imago (gonostylar muscle shown only on right side, gonovectal muscles shown only on left side, gonoducts shown by dotted line); 72, larval protogonostyli with developing subimaginal genitas inside. Abbreviations: gs1–gs3, segments of gonostylus; m.IX-X, areas of anterior attachment of median paraproctal muscles (i.e., muscles going from sternum IX to common base of paraprocts); m.sg, median sterno-styligeral muscle; pgs, protogonostylus; usg, unistyliger.

FIGURES 73–76. Potamocloeon edentatum sp. n. 73–75, eggs; 76, tergalius IV.