Phylum: Platyhelminthes (FLATWORMS)

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class: Turbellaria - Planarians class: Trematoda - Flukes class: Cestoidea - Tapeworms

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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