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This poster provides an
excellent introduction to animal development. The primary emphasis is
on the invertebrates. It will certainly become a "must have"
educational poster.
This poster uses a tree branching system that
incorporated "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. |
