Familae Indeterminatae: Larsen (2005): 242.
This is a collection of genera whose phylogenetic affinities to known families were uncertain in an analysis published by Larsen and Wilson (2002); a later listing in Larsen (2005) is also the basis for this classification of the following genus, Leptognathioides. The second genus covered, Portaratrum, was originally classified by its originator in the Colletteidae Larsen and Wilson, 2002 but was informally removed from that family by Guerrero-Kommritz and Brandt (2005); it was not mentioned in Larsen’ s classification.