Wikipedia
Sagenista
Sagenista is a group of heterokonts which at one time contained the bicosoecids and the slime nets Labyrinthulids. However at present the bicosoecids have been removed in order to make the group monophyletic, also a new group (class Eogyrea) of as yet uncultured protists were added as sister to the Labyrinthulids.
It has a special organelle called a Bothrosome. It is usually found in a marine environments rich in algae and sea grass. It is capable of movement by use of this organelle.
They are generally decomposers.