On the study of the central nervous system, axial skeleton and anterior metamerism of the balanoglossid, Ptychodera sp., and their bearing on the phylogeny of chordates.
D000818:Animals; D001842:Bone and Bones; D002490:Central Nervous System / Q000033:anatomy & histology*; D043344:Chordata; D006801:Humans; D009141:Musculoskeletal System; D009835:Oligochaeta; D010802:Phylogeny; D012863:Skeleton
CENTRAL NERVOUS SYSTEM/anatomy and histology; EARTHWORMS; SKELETON