Rhopalum Saini & Dey, 2022, s. str.
Creators: name: Saini, Varun
name: Dey, Debjani
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Crabronidae
Rhopalum

description: Key to the species of subgenus Rhopalum s. str. Stephens from Indian subcontinent
(Males of R. peterseni Tsuneki and R. gulmargense sp. nov. are unknown)
1. Female............................................................................................. 2
- Male............................................................................................... 6
2. Inter-antennal projection indistinct........................................................................ 3
- Inter-antennal projection conspicuous, prominent........................................................... 4
3. Clypeus: medial lobe truncate apically with inconspicuous lateral indentation; antennomere III not longer than wide; admedian line on scutum inconspicuous, mesopleuron smooth; hindtibia inconspicuously swollen apically.. R. croisseti Leclercq, 2011
- Clypeus: anterior margin rounded and slightly notched or broad with conspicuous lateral indentation (Fig. 4); antennomere III as long as or longer than wide; admedian line on scutum distinct; mesopleuron at least with distinct micro punctures; hindtibia different............................................................................................ 5
4. Clypeus: anterior margin minimally indented; inter-antennal tooth more or less truncate, directed downwards; punctation on mesoscutum very fine but clear and relatively dense; narrow yellow stripe on posterior surface of hindtibia, starting from base, not reaching apex; petiole moderately nodose apically.................................... R. avexum Leclercq, 1963
- Clypeus: anterior margin truncate (Fig. 181 of Tsuneki 1976); inter-antennal tooth rounded apically, directed forward (Fig. 182 of Tsuneki 1976); punctation on mesoscutum large; basal ring of hindtibia broad; petiole largely nodose apically (Fig. 184 of Tsuneki 1976)................................................................... R. peterseni Tsuneki, 1976
5. Body length: 6.4 mm; face narrow; anterior margin of clypeus rounded, slightly notched with inconspicuous lateral indentation; inner margin of compound eyes without carina; orbital fovea absent; hindtibia 3 inconspicuously swollen apically; pygidial area narrow at base..................................................................... R. adamsi Leclercq, 2011
- Body length: 7.4−7.6 mm; face broad; clypeus broad, slightly swollen medially, anterior margin dentate with conspicuous lateral indentation (Fig. 4); inner margin of compound eyes with well-defined carina (Fig. 4); orbital fovea indistinct but not absent, elliptical (Fig. 3); hindtibia markedly swollen apically (Fig. 2); pygidial area broader at base (Fig. 8)................................................................................... R. gulmargense Saini & Dey, sp. nov.
6. Antennomere VI or VII indented; clypeus free margin not tridentate; pygidial area without lateral border or with well-defined border.............................................................................................. 7
- Antennomere VI and VII not indented; clypeus free margin tridentate; pygidial area bordered laterally but not apically; length 4.2 mm ......................................................................... R. croisseti Leclercq, 2011
7. Clypeus: medial lobe subtruncate; tergum VII without border laterally; length 6 mm ............. R. adamsi Leclercq, 2011
- Clypeus: median lobe rounded apically; tergum VII forming flat pygidial area, with well-defined border; length 6.5 mm ................................................................................... R. avexum Leclercq, 1963
description: Published as part of Saini, Varun & Dey, Debjani, 2022, Description of Rhopalum (s. str.) gulmargense n. sp. with a key to the Indian species of the subgenus Rhopalum Stephens, 1829 s. str. (Hymenoptera: Crabronidae: Crabronini), pp. 139-144 in Zootaxa 5105 (1) on page 140, DOI: 10.11646/zootaxa.5105.1.6, http://zenodo.org/record/6332496