Phylogeny%20of%20basal%20animal%20groups%20(character%20mapping)

1
Phylogeny of basal animal groups (character
mapping)
Choanoflagellates
Ctenophores
Cnidaria
Bilateria
Porifera
body axis gt nervous system gt excretion gt
tissue layers gt grade of organization gt digestive
system gt
lt digestive system openings lt special cell
type lt locomotory structures
lt special cell type lt life cycle lt form of
locomotion
muscle location gt
grade of organization gt body axis gt digestion
gt nervous system gt
lt body construction
Directions gt 1. Fill in the state next to each
name to identify the shared, derived character
that evolved along branches leading to each
clade. Base your answers only on the
phylogenetic hypothesis and organisms shown.
Note that characters could change or reverse on
branches higher in the cladeyou are recording
the first origins of character changes. 2. For
the alternative phylogeny, dashes at the same
level imply the need for independent evolution of
the same trait. What are the traits?
extracellular material gt cell number gt grade of
organization gt
Alternative phylogeny (weak but consistent
molecular support)
digestion gt osmoregulatory organelle gt locomotory
structure gt
? gt
? gt
? gt