Currently a paraphyletic assemblage but with some well defined constituent clades. The lack of fascioles is primitive, as is the oblique median suture separating the sternal plates and ethmophract apical disc. Two taxa with partially developed peripetalous fascioles - Washitaster and Pseudowashitaster - are included here on account of their clear close overal similarity to Heteraster, a form lacking fascioles.
The following taxa may be toxasterids but are too poorly known to be determinate:
Allotoxaster Nisiyama, 1968
Somalechinus Checchia-Rispoli, 1945