Alphabetical Listing of Families within this Taxa Group:

family     Brissidae		T4009661
family     Eurypatagidae		T4023642
family     Loveniidae		T4015835
family     Macropneustidae		T4023650
family     Maretiidae		T4023651
family     Palaeotropidae		T4023658
family     Spatangidae		T4015802