What characteristic is responsible for the branching off of the flatworms from earlier animals?
What characteristic first shows up in this phylum?
ascoelomates
bilateral symmetry
What level of organization do these organisms demonstrate?
organ system level
How many tissue layers do these organisms have?
triploblastic -->epidermis, mesodermis, endodermis
What type of digestive system is seen in these animals?
gastrovascular cavity
When did they show up in the evolutionary history?
unknown
Where are they found?
worldwide
Type of Body Cavity
Acoelomate
Type of nervous system
Pair of anterior ganglia with longitudinal nerve cords
Type of Excretory system
Protonephridia (flame cells)
Type of Asexual reproduction
Regeneration