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I think platyhelminthes is faux phyla of animals.

Acoelomates: not actually platyhelminthes but they should be their own phylum.
-flat
-free living
-often predatory
-zero hooks around mouth

Human/Pork/Cow tapeworms:
I think they are modified earthworms, they have been tapeworms for 330 million years but have gradualle moved out from frog/lizard hosts and eventually ended as parasites of mammals, also it is worth noting first mammal like creatures appeared already 220 million years ago, its a long time ago

why they are not platyhelminthes:
-head is not flat altough everything that comes after the creatures head is infact flat
-mouth has a number of hooks it uses to keep itself attached into a intestine, acoelomates have nothing like this
-acoelomate mouth is in the CENTER of the worm and they are not even segmented animals
-tapeworm is segmented with headcapsule being the first segment, tapeworm head is almost as complicated as earthworms

things that is shared between "both types of flatworms"
-they can regenerate

are acoelamates and tapeworms genes identical?
-not even close