Author: Popov, 1947

Type species: Dioxys formosa Morawitz, 1875, by original designation.
Clade: Anthophila
Family: Megachilidae
SubF: Megachilinae
Tribe: Dioxyini
Distinctive traits
  •  2 submarginal cells
  • females without scopa (cleptoparasite)
  • bidentate mandible
  • scutellum with two lateral spines
  • metanotum with a small median tubercle
  • labrum with a basal transverse carina
Pictures of distinctive traits.
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Morphologically close genera, and how to distinguish them:
  • Metadioxys - Aglaoapis
Metadioxys species only have a tubercle on their metanotum. Anterior surface of the front coxa is impunctate, with a strong carina at the top.
Aglaoapis species have a strong median spine on their metanotum. Anterior surface of the front coxa is punctate, with a tubercle at the top.
  • Metadioxys - Dioxys & Paradioxys
Metadioxys species have a transverse carina on the labrum above the closed mandibles.
Dioxys & Paradioxys species have no transverse carina on the labrum.
  • Metadioxys - Ensliniana
Metadioxys species have a scutellum with two spines.
Ensliniana species have a rounded scutellum.
  • Metadioxys - Stelis
Metadioxys species have the second recurrent vein reaching within the second submarginal cell.
Stelis species have the second recurrent vein reaching at or beyond (apically) to the second submarginal cell.
  • Metadioxys - Coelioxys
Metadioxys species have rounded axillae, and 2 spine-like postero-lateral projections of the scutellum. Tip of the abdomen not pointed in females.
Coelioxys species have 2 tooth-like axillae and a rounded scutellum. Tip of the abdomen pointed in females.
General comments on Metadioxys species identification
There is only one species of Metadioxys recorded in Europe.
Metadioxys species found in Europe (IUCN 2014 + Rasmont et al 2017):
Metadioxys (Metadioxys) graeca (Mavromoustakis, 1963)
Online resources:
Exotic Bee ID (World)
WestPalBees (West Palearctic)
Page contributors:
  • Adrien Perrard (Dec. 2019)

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References used to write this page:
  • Michener, C.D. 2007. The Bees of the World, 2nd Edition. The John Hopkins University Press, Baltimore.
  • Michez D., Rasmont P., Terzo, M., Vereecken, N. 2019. Abeilles d'Europes. Hymenoptères d'Europes, Volume 1. N.A.P. Editions.
  • Nieto, A., Roberts, S. P., Kemp, J., Rasmont, P., Kuhlmann, M., García Criado, M., ... & Michez, D. 2014. European red list of bees. Luxembourg: Publication Office of the European Union, 98.
  •  Rasmont, P., Devalez, Jelle, Pauly, A., Michez, D. & Radchenko, V.G. 2017. Addition to the checklist of IUCN European wild bees (Hymenoptera: Apoidea). Annales de la Société entomologique de France 53: 17-32.