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