Xenacoelomorpha (/ˌzɛnəˌsɛloʊˈmɔːrfə/) is a small phylum of bilaterian invertebrate animals, consisting of two sister groups: xenoturbellids and acoelomorphs...

acoelomorphs were placed in phylum Xenacoelomorpha, together with the xenoturbellids, and the sister relationship between Xenacoelomorpha and Nephrozoa confirmed...

bilaterians other than Xenacoelomorpha. It contrasts with the Xenambulacraria hypothesis, which instead posits that Xenacoelomorpha is most closely related...

together sometimes are called the lower deuterostomes.) Whether the Xenacoelomorpha clade is the sister group to the Ambulacraria remains a contentious...

the extinct Kimberella. Together with Protostomia and their outgroup Xenacoelomorpha, they constitute the large infrakingdom Bilateria, i.e. animals with...

chordates, the latter of which contains the vertebrates. The simple Xenacoelomorpha have an uncertain position within Bilateria. Animals first appear in...

this hypothesis, Centroneuralia would be sister to Xenambulacraria (Xenacoelomorpha + Ambulacraria) at the base of Bilateria. Centroneuralia, as a proposed...

ParaHoxozoa: Placozoa, Cnidaria, Bilateria/Triploblast Bilateria: Xenacoelomorpha, Nephrozoa Nephrozoa: Protostomes, Deuterostomes Phylum Proarticulata...

Xenoturbellida is the sister group to acoelomorphs, constituting the so-called Xenacoelomorpha clade. The close evolutionary relationship between Acoelomorpha and...

sister phylum of the Chordates. Chordata, Ambulacraria, and possibly Xenacoelomorpha are believed to form the superphylum Deuterostomia, although this has...