is a specific kind of: class.

has as a member: oligochaete, oligochaete worm | angleworm, crawler, dew worm, earthworm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler | Branchiobdellidae, family Branchiobdellidae.

is a member of: Annelida, phylum Annelida.