Rediviva (Deriviva), 2020

Kuhlmann, Michael, Jürgensen, Lea-Sophie & Michez, Denis, 2020, Subgeneric classification of the bee genus Rediviva Friese (Hymenoptera: Apiformes: Melittidae), Zootaxa 4790 (2), pp. 318-328 : 320-322

Rediviva (Deriviva) subgen. nov.

Type species: Notomelitta intermixta Cockerell 1934: 450 ; designated here.

Rediviva intermixta (Cockerell 1934) : Transferred to Rediviva by Michener (1981: 47).

The five species placed in this subgenus (clade A of Kahnt et al. 2017) are listed in table 1.

Diagnosis. Males of Deriviva have a unique combination of lateral lobes of S7 either smooth (not striate) or completely reduced (striate in Rediviva s.str.), and median lobes either short and hardly longer than their basal width (much broader than long in Gigaviva ) or if longer forming jointly ± a right angle (acute-angled or parallel in Rediviva s.str.); median lobes not distinctly apically broadened ( Figs 2 a–b, d–e) (spatulate in Albiviva ). Apical plate of S8 distally notched ( Fig. 2c ) (strait, deeply cleft, emarginate or semi-circular in other subgenera), except in R. intermedia where it is evenly rounded ( Fig. 2f ). Males of Redivivoides species fit this diagnosis and are currently indistinguishable from Deriviva so can only be assigned to a subgenus through the associated female.

Females of three of the five species (Table 1) in this subgenus ( R. intermedia , R. intermixta , R. rufipes ) can be identified by a broadened hind tibia and basitarsus with the scopa consisting of densely plumose pubescence for transporting floral oil ( Fig. 3f ) (in Redivivoides hind tibia not broadened and without plumose pubescence), bidentate mandible (tridentate in Gigaviva ) and inconspicuous yellowish apical tergal hair bands ( Fig. 3b ) (distinct white apical hair bands in Albiviva ) in combination with a small shiny scale-like projection on the distal-dorsal angle of the hind basitarsus ( Fig. 3e ). In R. intermedia and R. rufipes this projection is in combination with an apical hairy spine on the front coxa ( Fig. 3d ). The remaining two species, R. colorata and R. saetigera , lack this projection and cannot be distinguished from females of Rediviva s. str.

Etymology. The new subgeneric name is an anagram of the generic name Rediviva . The gender of the name is feminine.

Distribution. Species of Deriviva occur in most parts of the range of the genus ( Whitehead & Steiner 2001, Whitehead et al. 2008).

Figures

FIGURE 2. Rediviva (Deriviva) intermixta Cockerell ♂: a. metasomal sternum 7, dorsal view; b. metasomal sternum 7, lateral view; c. metasomal sternum 8, apical plate. R. (Deriviva) intermedia Whitehead & Steiner ♂: d. metasomal sternum 7, dorsal view; e. metasomal sternum 7, lateral view; f. metasomal sternum 8, apical plate.

FIGURE 3. Rediviva (Albiviva) albifasciata Whitehead & Steiner ♀: a. metasoma with distinct white apical hair bands. R. (s. str.) whiteheadi Kuhlmann ♀: b. metasoma with indistinct yellowish apical hair bands. R. (Redivivoides) capensis (Kuhlmann) ♀: c. hind leg. R. (Deriviva) intermedia Whitehead & Steiner ♀: d. front leg, coxa with apical hairy spine (s). R. (Deriviva) intermixta Cockerell ♀: e. hind basitarsus with shiny scale-like projection; f. hind leg.