the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Annelida > [noun] > class Chaetopoda > order Oligochaeta > family Lumbriculidae > member of genus Lumbriculus (1)
An aquatic, oligochæte worm of the genus so called, resembling an earthworm.