Comparisons with amphioxus and tunicates have indicated that the vertebrate brain and peripheral nervous system were elaborated from those of an ancestral chordate with a bipartite brain ...

Specifically, the team found that the chordate nervous system, such as those in humans, evolved from an embryonic region of the ancestor that corresponds to echinoderm ciliary bands (Fig.

To address these questions, I am using the invertebrate chordate Ciona. Ciona with its fast development and fixed lineages, is an incredible model. During metamorphosis, most of the Ciona larval ...

Trichoplax "behaves as if it has a nervous system, yet lacks typical nerves ... to humans fit into just one subgroup of the phylum Chordata.) [Cambrian Creatures: See Photos of Primitive Sea ...