A fifth class of LOCATION@1 consisting of just two species , the Concentricycloidea -LRB- sea daisies -RRB- , were recently merged into the Asteroidea .

Concentricycloidea -LRB- sea daisies -RRB- , notable -LRB- important -RRB- for their unique -LRB- unusual , different -RRB- water vascular system ; two species ; recently merged into LOCATION@2 .
