This poster provides an excellent introduction to animal
development. The primary emphasis is on the invertebrates.
This poster uses a tree branching system that incorporates
"nodes." They are the point at which the tree branches.
Each node is a physical characteristic. All of the animals
that share that characteristic constitute a clade. For example,
the scientific name for animals is Metazoa. All share a common
physical characteristic, which is that they have two cell layers,
which distinguishes them from plants, which but one.
The new cladistics classification system is used to present an
overview of the primary clades. The only animals with two cell
layers are the sponges. They make up the Parazoa clade, which is
the same as the Poriferan phyla. The next step in animal development
is the the development of a third cell layer (the trioblastic layer.)
which provides the basis for anther clade. All other animals have
a hollow ball embryo. They constitute the Eumetazoa Clade. This
branching presentation continues through to the last clade, which
is accompanied by a brief description of the physical characteristics
of its members. This last clade corresponds to the phyla and the
phyla name is cited instead of the clade name. This is because
taxonomy, comparative anatomy and many other life science classes
still use the traditional classification system.
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Animal Development
(Click the poster
to see a more
detailed view of
this content-
intensive poster).
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