While this seems far more reasonable than some of the more extreme arrangements sometimes seen in Gelechioidea taxonomy and systematics, the relationships among Blastobasidae genera are not yet sufficiently studied to allow a well-supported subdivision of this family.

[2][3] The adults are generally small, slender moths which at a casual glance lack conspicuous and characteristic features – noted entomologist Edward Meyrick once described the group as "obscure and dull-coloured moths, decidedly the least attractive family of Lepidoptera".

The antenna base bears a small brush of dense hairs and is flat, with a concave underside and may cover part of the compound eyes.

The forewings lack a tornus and are about 4-5 times as long as they are wide, with a convex outer margin and a rather blunt tip.

The edge of the hindwings is surrounded by a fringe of hairs about two times as long as the wing is wide.

[5] Most of the roughly 30 genera of the Blastobasidae presently recognized are small or even monotypic, though Auximobasis and Pigritia are fairly diverse and Blastobasis and Holcocera are quite large.