Assertion: sponge's muscle | /r/CapableOf | arise in bilaterian
Facets:
value: from the mesoderm
type: LOCATION
Source sentences:
text: However, in 2005 Katja Seipel and Volker Schmid suggested that cnidarians and ctenophores are simplified descendants of triploblastic animals, since ctenophores and the medusa stage of some cnidarians have striated muscle, which in bilaterians arises from the mesoderm.