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A104 Animal Development
This exciting new poster is the first time the animal kingdom has
ever been shown through the development of physical characteristics.
It graphically demonstrates how the main branches of the new
cladistic classification system were established. A clade is a group
of organisms that share a common physical characteristic.
Animals differ from other life forms in that they have at
least two cell layers. This characteristic defines the Metazoa
(Animal Kingdom) clade. The next major physical development was the
addition of a third cell layer. All animals have them, except the
primitive sponges and jellyfish. Thus each of these three groups is
a clade.
The poster starts with the simplest animals then progresses to the
most complex, showing all of the important changes A branching
system design presents the nine primary clades, which are then
divided to the next level. Detailed illustrations show many
representative species. All are identified by captions.
This poster is largely devoted to the invertebrates and the
presentation shows how the various groups are related to one
another. It makes it easy to understand their common physical
characteristics and their differences. The vertebrates are
summarized in the lower right corner. The complexity of the subject
resulted in them being treated separately in Milestones of
Vertebrate Evolution. |
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The third (triploblasic)
cell layer permitted the development of a more complex body.
This clade is unique in that the animals share a second common
characteristic. They are also bilateral; each half is the mirror
image of the other. Authorities disagree as to which of the two
characteristics should be the defining one. This has resulted in
the clade being referred to by two different names,
Triploblastic and Bilateral. The poster cites both.
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Trochophore Larva |
Bryozoa |
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The Lophophotrochoa clade
contains the animals that have trochophore larva. These are
arranged into three clade / phyla - the bryozoa, the brachiopods and
the Phoronida. |
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Three poster Set |
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Animal Development,
Milestones of Evolution
and our new
Animal Kingdom
2 are
designed to be used both individually and together. Animal
Development focuses on the invertebrates and Milestones of
Vertebrate Evolution picks up where it leaves off. Both
show how the various clades evolved; Animal Kingdom show the
results. Teachers, students and professionals will find them to be
an invaluable reference. |
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