Lestagella Demoulin, 1970

Pereira-Da-Conceicoa, Lyndall L. & Barber-James, Helen M., 2013, Redescription and lectotype designation of the endemic South African mayfly Lestagella penicillata (Barnard, 1932) (Ephemeroptera: Teloganodidae), Zootaxa 3750 (5), pp. 450-464 : 452

Lestagella Demoulin, 1970

Lestagella Demoulin 1970: 130 , Figure 15 (a–r); McCafferty & Wang 1997: 403–405, Figures 7 , 16 , 25, 34, 43, 52, 61, 68, 72, 86.

Type species: Lithogloea penicillata by original designation

Diagnosis. Nymph. Lestagella nymphs can be distinguished from other Teloganodidae by the following combination of characters: a well-developed marginal fringe of setae on the head ( Fig. 2 c–e), spatulate setae on margin of prothorax, simple filamentous gills present on abdominal segment I, lamellate gills on segments II–IV with fully operculate gill on segment II, tibia lined with a single row of setae on the antero-dorsal surface, tarsal claw with well-developed subapical denticle, other denticles small. Abdominal segments with moderately developed posterolateral processes that are slightly separated from the base of the following segment, three caudal filaments with lateral, hair-like setae and a subequal median caudal filament.

Imago. Lestagella adults can be distinguished from other Teloganodidae by the combination of the following characters: three caudal filaments, forewings with a relatively short, detached iMP and the presence of gill socket vestiges on abdominal segments II–IV.

Figures

FIGURE 2. Paralectotypes of Lestagella penicillata. (a) Lateral view of adult female; (b) lateral view of adult male. Dorsal views of (c) female nymph and (d) male nymph, arrow showing foreleg regeneration where one foreleg is noticeably smaller than the other and without various types of setae. (e) Ventral view of male nymph. Scale bars = 1 mm.

FIGURE 15. Paralectotype nymph gills of Lestagella penicillata. (a) Filamentous first gill I on abdominal segment I; (b) operculate lamellate gill II found on abdominal segment II; (c) lamellate gill III; (d) lamellate gill IV.

FIGURE 16. Regrowth of mouthparts of Lestagella penicillata. (a) Left mandible; (b) right mandible; (c) maxilla; (d) hypopharynx; (f) labium and (f) labrum.

FIGURE 6 – 8. Paralectotype nymph of Lestagella penicillata. Fig. 6. Labrum showing (a) feathered setae; (b) remnant setal bases; (c) long, smooth setae (not feathered); Fig. 7. Hypopharynx, dorsal view (right) and ventral view (left); Fig. 8. Labium.