Cisanthrena Ramos & Melo, 2021

Ramos, Kelli S. & Melo, Gabriel A. R., 2021, Three new genera of Protandrenini bees from South America (Hymenoptera, Apidae, Andreninae), Revista Brasileira de Entomologia (e 20210096) 65 (4), pp. 1-10 : 6-7

Cisanthrena Ramos & Melo , new genus

( Figs. 4-5 )

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Type species. Cisanthrena perforata Ramos & Melo , new species

Diagnosis and comments. The new genus differs from all other genera of Protandrenini bees by the very coarsely punctate body, pronotum with a transverse lamella, protuberant interantennal area, metapostnotum slightly depressed with few longitudinal striae, rounded propodeum (without flat dorsal surface), marginal zones of metasomal terga smooth and depressed in relation to disc. Male with tentorial pit clearly below intersection between outer subantennal suture and epistomal sulcus ( Fig.4C ), strong postgradular depressions on metasomal terga of male ( Fig. 4D ), T7 with pigidial plate ( Fig. 5A ), S7 with two short apical lobes not constricted at their bases ( Fig. 5C ). It seems most similar to Pseudopanurgus and can be distinguished from it by the front coxae of females without large hairy apical spine or process, omaulus smoothly curved from lateral to anterior mesepisternal surfaces, scopa composed of sparse simple hairs, and outer margin of the hind tibia of the male toothed. The new genus also resembles Parapsaenythia, from which it differs mainly in its glabrous eyes, forewings with two submarginal cells, short and hairless basal portion of metapostnotum, and absence of basal hair bands on the metasomal terga.

Description. Small bees, body length between 5-6 mm. Body mostly black to brownish with yellow markings in females restricted to small spots on tibia of fore- and midlegs, and to head and legs in males. Tibial spurs, wing veins, and tarsi light brown; tegula and marginal zone of metasoma translucent brown. Pubescence predominantly short and very sparse in both sexes.Eyes glabrous; pronotal collar, pronotal lobe, mesepisternum, and lateral corners of propodeum with more dense and finely branched hairs; basal portion of metapostnotum glabrous; female hind tibial scopa loose with long and simple setae; T5–T6 of female with prepygidial and pygidial fimbriae sparse with plumose light brown hairs; T7 of males with very sparse hairs and glabrous pygidial plate; metasomal sterna with semierect long branched hairs in female and decumbent short pilosity in male, without modified specialized hairs. Integument surface very coarsely, deeply, and densely punctate. Metapostnotum and marginal zone of metasomal terga smooth, without punctures; basal portion of metapostnotum deep with longitudinal striations; pygidial plate of females reticulated, smooth in males; sterna of female reticulated with coarse punctures and in male mostly shiny, with weak reticulation and shallow punctures. Head as broad as long, slightly shorter than mesosoma; first labial palpomere shorter than the length of three distal palpomeres combined; maxillary palpus with six subequal palpomeres; outer subantenal suture converging below to inner suture; tentorial pit in intersection between outer subantennal suture and epistomal sulcus; antenna slightly longer than head width, especially in males; facial fovea deep; inner orbits of compound eyes convergent below; mesoscutum with mid and parapsidal lines evident; episternal groove extending below scrobal groove into omaulus area; forewing with two submarginal cells; pterostigma clearly wider than prestigma, margin within marginal cell convex; first submarginal cell longer than second; marginal cell truncate at apex and longer than the distance from its apex to wing tip; mid tibial spur finely serrate; apex of mid tibiae of males with small acute projection; tarsal claws distinctly bifid; hind tibia of male toothed on posterior margin; hind tibial spurs straight apically with similar length; marginal zone of metasomal terga strongly depressed in relation to disc; lateral foveae of T2 weakly depressed, inconspicuous; lateral line evident at least on Tl and T2; pygidial plate V-shaped in females, deeply notched apically in males; S6 of male slightly emarginated on distal margin ( Fig. 5B ); S7 with two short apical lobes not constricted at their bases ( Fig. 5C ); S8 of male gradually tapering to a distal projection ( Fig. 5D ); genitalia of male without basal sclerite; volsella with short digitus and cuspis, sclerotized dark teeth present on their opposable surfaces; gonocoxite without deep oblique impression; gonostylus about as long as gonocoxite, not articulated to gonocoxite, and with sparse long branched setae; penis valves simple, not surpassing the gonostylus length ( Figs. 5 E-F).

Species included. Cisanthrena perforata Ramos & Melo , new species.

Distribution. This genus is only known from southeastern Peru.

Etymology. The new genus-group name is a combination of the Latin “cis”, meaning “on this side of”, in reference to its occurrence on the eastern side of the Andes, in Peru, and Anthrena, an unjustified emendation of Andrena, used previously to form the names of other andrenine genera. The gender is feminine.

Figures

Figure 4 Cisanthrena perforata Ramos & Melo new species.A, head of female (holotype) in frontal view.B, female (holotype) in lateral view. C, head of male (paratype) in frontal view. D, male (paratype) in dorsal view. Scale bar: 1.0 mm.

Figure 5 Cisanthrena perforata Ramos & Melo new species, male paratype. A, apex of metasoma, showing the T7, in postero-dorsal view. B, S6 in ventral view. C, S7 in ventral view. D, S8 in ventral view. E, genitalia in lateral view. F, genitalia in ventral view.Scale bar 0.2 mm.