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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 supported...
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proposed major clade of
bilaterian animals.
Under this hypothesis,
Xenacoelomorpha forms the
earliest diverging branch of Bilateria, with all
other bilaterians...
- 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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sister phylum of the chordates. Chordata, Ambulacraria, and
possibly Xenacoelomorpha are
believed to form the
superphylum Deuterostomia,
although this has...
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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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latter of
which contains the vertebrates. The much
smaller basal phylum Xenacoelomorpha have an
uncertain position within Bilateria.
Animals first appeared...
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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...
- ParaHoxozoa: Placozoa, Cnidaria, Bilateria/Triploblast Bilateria:
Xenacoelomorpha,
Nephrozoa Nephrozoa: Protostomes,
Deuterostomes Phylum Proarticulata...
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Echinodermata phyla, all of
which are
found in
marine environments. In the
Xenacoelomorpha, a
phylum of
bilaterally symmetrical animals,
members of the subphylum...
