Describe the body plans of animals. Include types of symmetry, germinal tissues, body cavities, and protostome...

Describe the body plans of animals. Include types of symmetry, germinal tissues, body cavities, and protostome vs. deuterostome development.

Expert Solution

# Symmetry

Animals can be divided into three types based on the body plane of symmetry. They are,

Asymmetry; There is no plnane of symmetry. eg. sponge

Bilaterlly semmetry; Animal can be divided into two equal half at only one point. eg. annelid

Radially symmetry; Animal can be divided into two equal half at any point. eg., echinoderms

# Germinal tissue layer

There are three layers in the germ tissues of the animal. They are ectoderm, mesoderm and

endoderm.

Diploblast; Made of two layers. ectoderm and endoderm. eg. cnidaria

Triploblast; Made of three layers, ecto, meso and endoderm. eg; annelids

# Body cavities (Coelom)

Based on the presence of body cavity animals can be divided into three types. This is a cavity located between the intestinal canal and the body wall.

Acoelomate; No body cavity. eg., Platyhelminthes

Pseudoceolomate; A false coelom is present. eg., Nemathelminthes

Coelomates; A true coelom is present

# Protostomes; First mouth develops from the blastospore. eg. invertebrates

# Deutrostomes; First anal canal forms from the blastospore. eg. Chordates.

gladiator answered 2 months ago

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