Phylogeny%20of%20basal%20animal%20groups

1
Phylogeny of basal animal groups Note On an exam
you would not be given the labels, only the
phylogeny. Use this exercise to organize your
understanding of when major features evolved.
Choanoflagellates
Ctenophores
Cnidaria
Bilateria
Porifera
special cell type gt locomotory structures
gt digestive system openings gt
lt special cell type lt atypical life cycle lt form
of locomotion
body axis gt nervous system gt excretion gt grade of
organization gt tissue layers gt digestive system
gt contractile structure gt fluid-filled space
lined by tissue gt name/embryonic source of
tissue gt
lt gravity detection structures lt body composition
lt body construction lt special cell type lt
endoskeleton components
body axis gt arrangement of cells gt epithelial
features gt digestion location gt nervous system
type gt
number of cells gt extracellular material gt grade
of organization gt connective tissue protein gt
Directions gt Pictured is a phylogeny and a set of
branches along which characters evolved. Fill in
the state change next to each label to identify
the shared, derived character that evolved along
the branches leading to each clade. Base your
answers only on the phylogenetic hypothesis for
the organisms shown. Note that characters could
change or reverse on branches higher in the
cladeyou are recording the first origins of
character changes.
feeding method gt digestion organelle
gt osmoregulatory organelle gt locomotory organelle
gt special cell type gt