Alphabetical Listing of Families within this Taxa Group:

family     Acanthochiasmidae		T2006523
family     Acanthometridae		T2002482
family     Actinommidae		T2006513
family     Artostrobiidae		T2006519
family     Astrolonchidae		T2004076
family     Cannobotryidae		T2004078
family     Carpocaniidae		T2006517
family     Coccodiscidae		T2006520
family     Collozoidae		T2006515
family     Heliodiscidae		T2006689
family     Litheliidae		T2006522
family     Plagiacanthidae		T2006516
family     Pterocorythidae		T2006518
family     Pyloniidae		T2004144
family     Spongodiscidae		T2006514
family     Theoperidae		T2004105
family     Tholoniidae		T2006521
family     Trissocyclidae		T2004061