Subgenus Tkalcua
The subgenus Tkalcua Kocak & Kemal is confined to the Palaearctic region. It contains 2 species. 1 Palaearctic species is still undescribed (Dathe et al., 2009).
Species accounts
Hoplitis (Tkalcua) paralias (Mavromoustakis, 1954)
1954 Osmia paralias Mavromoustakis, Bulletin of the Research Council of Israel, 4: 266. Type material: Holotype f, “Bat Yam” [Israel], DAAN (Nicosia); paratypes mm, ff.-Combination Stenosmia paralias (Mavromoustakis) in Zanden (1988b: 128), rejected by Warncke (1991b: 402). Combination Hoplitis (Microhoplitis) paralias (Mavromoustakis) in Ungricht et al. (2008).
Distribution- Northern Africa: MA, TN. Southwestern Asia: IL.
Identification-Keys, Descriptions: Zanden (1992c: 824).
Nesting biology: Unknown.
Flower preferences: Unknown.
Hoplitis (Tkalcua) zandeni (Teunissen & van Achterberg, 1992)
1992 Osmia zandeni Teunissen & van Achterberg, Zoologische Mededelingen (Leiden), 66: 313. Type material: Holotype m, “Puerto del Rosario, Fuerteventura” [Spain: Canary Islands], RMNH (Leiden); paratypes mm, ff.
1993 Osmia (Microhoplitis) hohmanni Tkalcu, Veröffentlichungen des Übersee-Museum Bremen (Naturwissenschaften), 12: 812. Type material: Holotype m, “Fuerteventura Risco del Paso” [Spain: Canary Islands], La Roche Collection; paratypes mm, ff. Type species of Microhoplitis Tkalcu.-Synonymy in Zanden (1995: 428).
Distribution-Northern Africa: E(Ca).
Identification-Keys, Descriptions: No supplementary or more detailed morphological description known.
Nesting biology: Unknown.
Flower preferences: Unknown. Flower records: Launaea arborescens, Phagnalon, Heliotropium ramosissimum, Ononis (Hohmann et al., 1993).