Phylum vertebrata: New concepts based on advances in animal systematics Date: September 17, 2014 ... Chordates include all animals with a notochord or dorsal neural tube, ...

The Middle Cambrian chordate known as Pikaia gracilens was once thought to be humanity’s earliest known ancestor, and the earliest known member of the phylum Chordata.; Now, a new study flips ...

The presumed blood vessel was a dorsal nerve cord, a feature associated with the animal group known as chordates, in the phylum Chordata. Annotated photos show the newly revised organization of ...

Several seemingly unusual schemes have been put forward recently, but now Bourlat et al. resolve these in a new study that affirms that the chordates form a single phylum, and finds an ...

The planktonic organism Oikopleura dioica, an animal model in the study of evolution and embryonic development in our phylum (chordates), has lost most of the genes related to retinoic acid ...