Between the turbellarian and the annelid many aberrant lines diverged.
He isolated the first two blastomeres of the egg of Lanice, an annelid.
The actions of all animals below the annelid are mainly reflex or automatic, unconscious and involuntary.
But in the annelid the mouth is on the second segment; here it is on the fourth.
Sometimes an annelid worm lives inside the shell along with the hermit and often the outside is covered with zoophytes.
They transformed the annelid parapodia into legs and developed wings.
The eye of the turbellaria distinguishes only light from darkness, that of the annelid is a true visual organ.
Clitellum, kli-tel′um, n. the saddle of an annelid, as the earthworm:—pl.
He was afterwards associated with H. Milne Edwards in works on annelid worms.
Dohrn assumed also that the primitive annelid ancestor must have possessed a notochord to give support in swimming.