sister to the Apocrita. Orussidae genera and species of the World An identification key for the genera of the World was published by Vilhemsen (2003). The following list summarizes the genera and species and their gross distribution together with indications on identification keys: Argentophrynopus Vilhelmsen & D.R. Smith, 2002: 2 species, Costa Rica and supposedly Mexico. Taxonomy: Vilhelmsen & Smith (2002). †Baltorussus Schedl, 2011: 1 fossil species, Baltorussus velteni Schedl, 2011 from Baltic amber. Taxonomy: Schedl (2011). Chalinus Konow, 1897: 9 Afrotropic species. Taxonomy: Vilhelmsen (2001), Vilhelmsen (2005). Guiglia Benson, 1938: 7 Australian species, plus Guiglia chiliensis Benson, 1955 in Chile. Taxonomy: Vilhelmsen & Smith (2002). Kulcania Benson, 1935: 2 species in Colombia, Costa Rica, Mexico and the USA. Taxonomy: Vilhelmsen & Smith (2002). Leptorussus Benson, 1955: 2 Afrotropic species. Taxonomy: Vilhelmsen (2003), Vilhelmsen (2007). †Mesorussus Rasnitsyn, 1977: 1 fossil species, Mesorussus taimyrensis Rasnitsyn, 1977. Taxonomy: Rasnitsyn (1977). †Minyorussus Basibuyuk, Quicke & Rasnitsyn, 2000: 1 fossil species, Minyorussus luzzii Basibuyuk, Quicke & Rasnitsyn, 2000. Taxonomy: Basibuyuk et al. (2000). Mocsarya Konow, 1897: 2 species, Mocsarya metallica (Mocsáry, 1896) in Indonesia and Sri Lanka, Mocsarya syriaca Benson, 1936 in Greece and Turkey (not in Syria!). Taxonomy: Vilhelmsen (2001)., Ophrella Middlekauff, 1985: 3 species, O. amazonica (Westwood, 1874) in French Guiana, Brazil and Panama, O. eldorado Vilhelmsen, 2013 and O. seagi Vilhelmsen 2016 in French Guiana. Taxonomy: Vilhelmsen & Smith (2002), Vilhelmsen et al. (2013), Vilhelmsen (2016). Ophrynon Middlekauff, 1983: 4 species in California (USA). Taxonomy: Vilhelmsen & Smith (2002), Blank et al. (2010). Ophrynopus Konow, 1897 (synonym: Stirocorsia Konow, 1897): 17 species in Japan, Indonesia, Laos, Malaysia, Philippines, Papua New Guinea and in the Neotropic realm. Taxonomy: Vilhelmsen & Smith (2002), Vilhelmsen et al. (2013). Orussella Benson, 1935: 1 species, Orussella dentifrons (Philippi, 1783), in Chile. Taxonomy: Vilhelmsen (2003). Orussobaius Benson, 1938: 9 species in Australia, Papua New Guinea and the Tanimbar Islands. Taxonomy: Schmidt & Vilhelmsen (2002)., Blank & Vilhelmsen (2016) Orussonia Riek, 1955: 2 species in Australia. Taxonomy: Schmidt & Gibson (2001). Orussus Latreille, 1797: 29 species in the Holarctic and Oriental realms. Taxonomy: Vilhemsen (2003, species of the World), Blank et al. (2006, O. abietinus and O. smithi), Vilhelmsen et al. (2013, species of the World). Pedicrista Benson, 1935: 1 species, Pedicrista hyalina Benson, 1935, in Malawi, South Africa and Zimbabwe. Taxonomy: Vilhelmsen (2003). Pseudoryssus Guiglia, 1954: 2 species in the West Palaearctic. Taxonomy: Kraus (1998), Blank et