The earliest known primitive chordate is Pikaia gracilens ... (a rodlike primitive backbone), a significant step in the evolution of vertebrates. Cambrian sediments found in Canada, Greenland ...

Amphioxus is the most basal extant chordate and is thought to closely resemble the invertebrate ... and developmental changes underlying the earliest events in vertebrate evolution. Cerny, R, Cattell, ...

Name the type of modification of timing of developmental events described for human evolution. Heterochrony or, more specifically, neoteny. In chordate evolution, ancestral tunicate-like form lost ...

and other chordate animals. Form, function and evolutionary drivers of body systems in vertebrate animals are examined, especially in practical work. Evidence for evolution is emphasised in ...