Download Basal phyla - Robert D. Podolsky

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.
< special cell type
< atypical life cycle
< form of locomotion
< gravity detection structures
< body composition
< body construction
< special cell type
< endoskeleton components
Directions >
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 clade—you are recording the
first origins of character changes.]
special cell type >
locomotory structures >
digestive system openings >
body axis >
nervous system >
excretion >
grade of organization >
tissue layers >
digestive system >
contractile structure >
fluid-filled space lined by tissue >
name/embryonic source of tissue >
body axis >
arrangement of cells >
epithelial features >
digestion location >
nervous system type >
number of cells >
extracellular material >
grade of organization >
connective tissue protein >
feeding method >
digestion organelle >
osmoregulatory organelle >
locomotory organelle >
special cell type >