• Jul 30, 2025 general organization and affinities of cephalochordata y of chordates and vertebrates. Phylogenetic Position within Chordata Chordate Phylum: Cephalochordates are considered the most primitive living members of the phylum, retaining ancestral features. Relation to Vertebrates: Molecular and morphological data suggest that lancelets are the closest liv By Joanna Keeling
