Echinoderms

1
Echinoderms
Feather star
Sea lily
2
Echinoderms
Sand dollar
Sea cucumber
Brittle star
3
Deuterostomes vs. protostomes
Body cavities form differently Mouth forms in
different place
4
Plane of cleavage differs
5
(Cephalochordate)
(Urochordate)
(4) Neoteny
(Enteropneusts)
(3) Free-swimming larva
(2) Shift to gills for feeding
(1) Bottom-dwelling filter feeder with lophophore
arms
Possible evolutionary tree of early vertebrates
6
Mass extinctions
Origins of synapsids
Cotylosaurs (stem reptiles)
Age of amphibians
Crossopterygians
Age of fishes
Placental mammals monotremes, marsupials
droughts
Land invasion
Mass extinctions
Initial radiation of the vertebrates
1st angiosperms
Lots of soft-bodied invertebrates
Origin of birds
Agnathans
Thecodonts
Origin of mammals