Suctorian

noun

1. Any of various aquatic protozoans of the subclass Suctoria that have a free-swimming ciliated immature form and a sessile, stalked adult form that lacks cilia and feeds by means of suctorial tentacles.
2. A suctorial animal; a member of the Suctoria, in any sense; especially, a cyclostomous fish.
3. A cartilaginous fish with a mouth adapted for suction, as the lampery.
4. One of the Suctoria.
5. A protist of the subclass Suctoria in the class Phyllopharyngea; a predatory sessile ciliate.