The remaining peracarida orders are the cryptic and either moderately plentiful , Cumacea and Tanaidacea , or are extremely rare and Relictual , Mictacea , Spelaeogriphacea and Thermosbaenacea .
The other Peracarida orders are the abundant and either moderately cryptic , Cumacea and Tanaidacea , or are extremely rare and Relictual , Mictacea , Spelaeogriphacea and Thermosbaenacea .