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1 Tree was published in this study

A mid-cretaceous origin of sociality in xylocopine bees with only two origins of true worker castes indicates severe barriers to eusociality.
Rehan, Leys, Schwarz. (2012). PLoS One.
Ceratina calcarata Ceratina floridana Ceratina strenua Ceratina nanula Ceratina cockerelli Ceratina rectangulifera Ceratina japonica Ceratina flavipes Ceratina okinawana Ceratina_(Hirashima)_sp._S._Africa_1 Ceratina_(Hirashima)_sp._S._Africa_2 Ceratina lativentris Ceratina chalcites Ceratina azurea Ceratina ericia Ceratina malindae Ceratina moerenhouti Ceratina rhodura Ceratina braunsi Ceratina smaragdula Ceratina binghami Ceratina_(Pithitis)_sp._Kenya Ceratina tarsata Ceratina dentipes Ceratina_(Neoceratina)_sp._Samoa_268 Ceratina satoi Ceratina bispinosa Ceratina propinqua Ceratina minutula Ceratina australensis Exoneura nigrescens Exoneura robusta Exoneura angophorae Inquilina excavata Inquilina schwarzi Brevineura xanthoclypeata Brevineura elongata Brevineura ploratula Exoneurella setosa Exoneurella eremophila Exoneurella lawsoni Exoneurella tridentata Braunsapis unicolor Braunsapis vitrea Allodape friesei Allodapula empeyi Compsomelissa borneri Exoneuridia hakkariensis Halterapis minuta Halterapis seyrigi Macrogalea antanosy Macrogalea zanzibarica Manuelia postica Manuelia gayatina Manuelia gayi Xylocopa caffra Xylocopa pubescens Xylocopa lieftincki Xylocopa nigrita Xylocopa bombylans Xylocopa aeratus Xylocopa sicheli Xylocopa lugubris Xylocopa auripennis Xylocopa frontalis Xylocopa grisescens Xylocopa tranquebarica Xylocopa violacea Xylocopa sulcatipes Bombus terrestris Apis mellifera
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