Opinions from M. S. Engel 2001
- 'Andrenetae is corrected as Andrenidae and belongs to Apoidea'
- 'Andreninae belongs to Andrenidae'
- 'Anthidiina belongs to Anthidiini'
- 'Anthidiinae was reranked as the tribe Anthidiini and belongs to Megachilinae'
- 'Anthidium belongs to Anthidiina'
- 'Anthophoridae was reranked as the tribe Anthophorini and belongs to Apinae'
- 'Apes is corrected as Apinae and belongs to Apidae'
- 'Apiariae is corrected as Apidae and belongs to Apoidea'
- 'Apini belongs to Apinae'
- 'Apis meliponoides is recombined as Electrapis meliponoides'
- 'Apis palmnickenensis is recombined as Roussyana palmnickenensis'
- 'Apis proava is recombined as Melikertes proavus'
- 'Augochlora belongs to Augochlorina'
- 'Augochloridae was reranked as the tribe Augochlorini and belongs to Halictinae'
- 'Augochlorina belongs to Augochlorini'
- 'Bombini belongs to Apinae'
- 'Bombus carbonarius is a nomen dubium'
- 'Bombus pusillus is a nomen dubium'
- 'Boreallodape belongs to Boreallodapini'
- 'Boreallodape baltica belongs to Boreallodape'
- 'Boreallodape mollyae belongs to Boreallodape'
- 'Boreallodape striebichi belongs to Boreallodape'
- 'Boreallodapini belongs to Xylocopinae'
- 'Ceratinidae was reranked as the tribe Ceratinini and belongs to Xylocopinae'
- 'Chalcobombus is a subjective synonym of Protobombus'
- 'Chalcobombus hirsutus is recombined as Protobombus hirsutus'
- 'Chalcobombus humilis is a subjective synonym of Protobombus indecisus'
- 'Chalcobombus martialis is recombined as Electrapis martialis'
- 'Colletidae belongs to Apoidea'
- 'Ctenoplectrella belongs to Ctenoplectrellina'
- 'Ctenoplectrella cockerelli belongs to Ctenoplectrella'
- 'Ctenoplectrella dentata is a subjective synonym of Ctenoplectrella viridiceps'
- 'Ctenoplectrella grimaldii belongs to Ctenoplectrella'
- 'Ctenoplectrella splendens is a subjective synonym of Ctenoplectrella viridiceps'
- 'Ctenoplectrella viridiceps belongs to Ctenoplectrella'
- 'Ctenoplectrellina belongs to Osmiini'
- 'Ctenoplectrinae was reranked as the tribe Ctenoplectrini and belongs to Apinae'
- 'Cyrtapis belongs to Halictina'
- 'Dasypoda belongs to Dasypodaini'
- 'Dasypodaini belongs to Dasypodainae'
- 'Dasypodinae is corrected as Dasypodainae and belongs to Melittidae'
- 'Dianthidium belongs to Anthidiina'
- 'Eckfeldapis is a subjective synonym of Electrapis'
- 'Electrapini belongs to Apinae'
- 'Electrapis belongs to Electrapini'
- 'Electrapis (Electrapis) apoides is a subjective synonym of Protobombus indecisus'
- 'Electrapis (Melikertes) was reranked as Melikertes and belongs to Melikertini'
- 'Electrapis (Melikertes) stilbonota is recombined as Melikertes stilbonotus'
- 'Electrapis (Roussyana) was reranked as Roussyana and belongs to Melikertini'
- 'Electrapis bombusoides belongs to Electrapis' according to Kelner-Pillaut 1974
- 'Electrapis bombusoides is a subjective synonym of Electrapis tornquisti'
- 'Electrapis krishnorum belongs to Electrapis'
- 'Electrapis minuta is a subjective synonym of Apis palmnickenensis'
- 'Electrapis tornquisti belongs to Electrapis'
- 'Electrobombini belongs to Apinae'
- 'Electrobombus belongs to Electrobombini'
- 'Electrobombus samlandensis belongs to Electrobombus'
- 'Electrolictus belongs to Halictini'
- 'Electrolictus antiquus belongs to Electrolictus'
- 'Eomacropidini belongs to Macropidinae'
- 'Eomacropis belongs to Eomacropidini'
- 'Eomacropis glaesaria belongs to Eomacropis'
- 'Eucerini belongs to Apinae'
- 'Euglossae was reranked as the tribe Euglossini and belongs to Apinae'
- 'Glaesosmia belongs to Osmiini'
- 'Glaesosmia genalis belongs to Glaesosmia'
- 'Glyptapinae was reranked as the subtribe Glyptapina and belongs to Osmiini'
- 'Glyptapis belongs to Glyptapina'
- 'Glyptapis densopunctata belongs to Glyptapis'
- 'Glyptapis disareolata belongs to Glyptapis'
- 'Glyptapis fuscula belongs to Glyptapis'
- 'Glyptapis mirabilis belongs to Glyptapis'
- 'Glyptapis neglecta is a subjective synonym of Glyptapis fuscula'
- 'Glyptapis reducta is a subjective synonym of Glyptapis fuscula'
- 'Glyptapis reticulata is a subjective synonym of Glyptapis fuscula'
- 'Halictidae belongs to Apoidea'
- 'Halictina belongs to Halictini'
- 'Halictinae belongs to Halictidae'
- 'Halictini belongs to Halictinae'
- 'Halictus belongs to Halictina'
- 'Hypotrigona eocenica is recombined as Kelneriapis eocenica'
- 'Kelnermelia is a subjective synonym of Kelneriapis'
- 'Liotrigonopsis belongs to Meliponini'
- 'Liotrigonopsis rozeni belongs to Liotrigonopsis'
- 'Lithanthidium belongs to Anthidiina'
- 'Lithurge belongs to Lithurgini'
- 'Lithurginae belongs to Megachilidae'
- 'Lithurgini belongs to Lithurginae'
- 'Macropidinae belongs to Melittidae'
- 'Macropidini belongs to Macropidinae'
- 'Macropis belongs to Macropidini'
- 'Megachiles is corrected as Megachilinae and belongs to Megachilidae'
- 'Megachilidae belongs to Apoidea'
- 'Melectides was reranked as the tribe Melectini and belongs to Apinae'
- 'Melikertes clypeatus belongs to Melikertes'
- 'Melikertini belongs to Apinae'
- 'Meliponites is corrected as Meliponini and belongs to Apinae'
- 'Meliponorytes belongs to Meliponini'
- 'Meliponorytes succini belongs to Meliponorytes'
- 'Melissites belongs to Melikertini'
- 'Melissites trigona belongs to Melissites'
- 'Melitta belongs to Melittini'
- 'Melittidae belongs to Apoidea'
- 'Melittinae belongs to Melittidae'
- 'Melittini belongs to Melittinae'
- 'Neocorynura belongs to Augochlorina'
- 'Oligochlora belongs to Augochlorina'
- 'Osmiini belongs to Megachilinae'
- 'Paleomelitta belongs to Paleomelittidae'
- 'Paleomelitta nigripennis belongs to Paleomelitta'
- 'Paleomelittidae belongs to Apoidea'
- 'Panurginae belongs to Andrenidae'
- 'Protandrenini belongs to Panurginae'
- 'Protobombus belongs to Electrapini'
- 'Protobombus basilaris belongs to Protobombus'
- 'Protobombus indecisus belongs to Protobombus'
- 'Protobombus tristellus belongs to Protobombus'
- 'Protolithurgini belongs to Lithurginae'
- 'Protolithurgus belongs to Protolithurgini'
- 'Protolithurgus ditomeus belongs to Protolithurgus'
- 'Sinostigma belongs to Vespidae'
- 'Sinostigma spinalata belongs to Sinostigma'
- 'Sophrobombus is a subjective synonym of Protobombus'
- 'Sophrobombus fatalis is recombined as Protobombus fatalis'
- 'Succinapis belongs to Melikertini'
- 'Succinapis goeleti belongs to Succinapis'
- 'Succinapis micheneri belongs to Succinapis'
- 'Succinapis proboscidea belongs to Succinapis'
- 'Thaumastobombus belongs to Electrapini'
- 'Thaumastobombus andreniformis belongs to Thaumastobombus'
- 'Trigona (Kelneriapis) was reranked as Kelneriapis and belongs to Meliponini'
- 'Xeromelissinae belongs to Colletidae'
- 'Xylocopae is corrected as Xylocopinae and belongs to Apidae'
- 'Xylocopini belongs to Xylocopinae'