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Search Results: acoela phylogeny and systematics

Acoelomates are triploblastic animals that lack an internal body cavity. Included in this group are the Acoela (acoel flatworms), which represent the...


= Encyclopedia Article; = Research Update
Figure 1.Bilateral symmetry, in which only a section along the sagittal plane divides the body into two symmetrically identical halves.
Figure 2.Classical and new hypotheses regarding the first bilaterian taxa. (a) Acoelomate platyhelminths are the sister group of all the other Bilateria. (b) Platyhelminths appear within the lophotrochozoans. Acoels are not grouped with the rest of the flatworms. Acoels represent the extant descendants of one of the first organisms with bilateral symmetry, occupying a pivotal position between diploblast and triploblast organisms.
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