Definition that contains annelid worm
- family branchiobdellidae small annelid worms with the posterior end modified into an adhesive sucker; especially formerly regarded as modified leeches
- polychaeta marine annelid worms
- peripatus any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms
- branchiobdellidae small annelid worms with the posterior end modified into an adhesive sucker; especially formerly regarded as modified leeches
- velvet worm any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms
- chaeta a stiff chitinous seta or bristle especially of an annelid worm
- class polychaeta marine annelid worms
- onychophoran any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms