Phylogenetic tree on Apoidea is c. 2018 and does not match the phg. relationships given in family articles, e.g. Bembici(n/d)ae given as outgroup of Sphecidae rather than as subfamily nested within Crabronidae
Move to a template of its own and transclude onto relevant page(s)?
diffinis – update: diffinis as species complex; splitting off of thetis in 2009, aethra in 2018; potential remaining cryptic species (Schmidt 2009, 2018)
gracilis – do quick lit review; occurrence? decline? extremely spotty distribution + many modern records are unreliable or wrong & actually thysbe or diffinis