-
Bilateria (/ˌbaɪləˈtɪəriə/) is a
large clade of
animals characterised by
bilateral symmetry during embryonic development. This
means their body
plans are...
- specialized,
because they lack both true
tissues and organs. The
earliest triploblasts are
thought to have
evolved from the
diploblasts at some time during...
- some invertebrates, such as Porifera, Cnidaria, Ctenophora, and some
triploblasts (namely the acoelomates), the term "mesenchyme"
refers to a more-or-less...
- words, they have two main cell layers,
while more
complex animals are
triploblasts having three main layers. The two main cell
layers of
cnidarians form...
- the gut and body wall hold
their organs in place.
Coeloms developed in
triploblasts but were
subsequently lost in
several lineages. The lack of a coelom...
-
blood vascular system first appeared probably in an
ancestor of the
triploblasts over 600
million years ago,
overcoming the time-distance constraints...
- the
first time in the diploblasts, but
modern forms only
appeared in
triploblasts. The
epithelium in all
animals is
derived from the
ectoderm and endoderm...
-
Porifera (Sponges)
Parahoxozoa Excludes Ctenophora (Comb Jellies)
Bilateria Triploblasts /
Worms 560
Nephrozoa Deuterostomia Division from
Protostomes Phylum...
- Diploblasts: Ctenophora,
ParaHoxozoa ParaHoxozoa: Placozoa, Cnidaria, Bilateria/
Triploblast Bilateria: Xenacoelomorpha,
Nephrozoa Nephrozoa: Protostomes, Deuterostomes...
-
Placozoa (Trichoplax and relatives)
Cnidaria (jellyfish and relatives)
Bilateria (
Triploblasts) (see below↓)...
