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For Insects, Spiders & Their Kin
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Subgenus Opandrena, formerly included in Holandrena

Unidentified bee - Andrena cressonii Andrena? with yellow face - Andrena cressonii Andrena cressonii? - Andrena cressonii Andrena on Toothwort - Andrena cressonii Andrena  - Andrena cressonii Andrena  - Andrena cressonii Andrena  - Andrena cressonii Hylaeus Bee - Andrena cressonii - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Aculeata - Ants, Bees and Stinging Wasps)
No Taxon (Apoidea (clade Anthophila) - Bees)
Family Andrenidae (Miner, Fairy, Allied Panurgine, and Oxaeine Bees)
Subfamily Andreninae (Mining Bees)
Genus Andrena
No Taxon Subgenus Opandrena, formerly included in Holandrena
Explanation of Names
Opandrena Robertson 1902
Numbers
4 spp. in our area, 18 spp. total(1)
Range
holarctic, more diverse in the Old World; in our area, 1 sp. transcontinental in the US and adjacent Canada + 3 in sw. US(1)