LIFESCI 1 Chapter Notes - Chapter 35: Water Vascular System, Neoteny, Evolution Of Fish
Document Summary
The most prominent deuterstome lineages are the echinoderms and the vertebrate groups called ray-finned fishes and tetrapods. Echinoderms and vertebrates have unique body plans. Echinoderms are radially symmetric as adults and have a water vascular system. All vertebrates have a skull, and most have an extensive endoskeleton made of cartilage or bone. The diversification of echinoderms was triggered by the evolution of appendages called podia. (what is podia?) The diversification of vertebrates was driven by the evolution of the jaw and limbs. Initially grouped because of similarities in early development. Feeding, locomotion, and reproductive modes are highly diverse. Approaching the world in more than one direction. Phylum chordata consists of three major subgroups. Paedomorphosis an alteration of the timing when adult and larval characters are expressed. Progenesis- the juviniles form becomes reproductively mature. Can be different for different stages in the life cycle. Gas exchange is different in aquatic and terrestrial environments.
