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Xenacoelomorpha (/ˌzɛnəˌsɛloʊˈmɔːrfə/) is a
small phylum of
bilaterian invertebrate animals,
consisting of two
sister groups:
xenoturbellids and acoelomorphs...
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acoelomorphs were
placed in
phylum Xenacoelomorpha,
together with the xenoturbellids, and the
sister relationship between Xenacoelomorpha and
Nephrozoa confirmed...
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bilaterians other than
Xenacoelomorpha. It
contrasts with the
Xenambulacraria hypothesis,
which instead posits that
Xenacoelomorpha is most
closely related...
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sister phylum of the chordates. Chordata, Ambulacraria, and
possibly Xenacoelomorpha are
believed to form the
superphylum Deuterostomia,
although this has...
- and spiralians, as well as the
extinct Kimberella.
Together with the
Xenacoelomorpha,
these constitute the
large clade Bilateria, i.e.
animals with bilateral...
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latter of
which contains the vertebrates. The much
smaller basal phylum Xenacoelomorpha have an
uncertain position within Bilateria.
Animals first appear in...
- ParaHoxozoa: Placozoa, Cnidaria, Bilateria/Triploblast Bilateria:
Xenacoelomorpha,
Nephrozoa Nephrozoa: Protostomes,
Deuterostomes Phylum Proarticulata...
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together sometimes are
called the
lower deuterostomes.)
Whether the
Xenacoelomorpha clade is the
sister group to the
Ambulacraria remains a contentious...
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schizocoely typically occurs in them.
Together with the
Deuterostomia and
Xenacoelomorpha,
these form the
clade Bilateria,
animals with
bilateral symmetry, anteroposterior...
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Xenoturbellida is the
sister group to acoelomorphs,
constituting the so-called
Xenacoelomorpha clade. The
close evolutionary relationship between Acoelomorpha and...
