3. Protostomes and Deuterostomes
• based on the embryonic development, metazoans are divided into
protostomes and deuterostomes.
• Protostomes are primitive invertebrates while deuterostomes include
chordates and echinoderms.
• Given below in a tabular column are the differences between protostomes
and deuterostomes.
4.
5. Protostomes and Deuterostomes
• The primary gut that forms during gastrulation in the developing zygote is
known as the archenteron or the digestive tube. It develops into the
endoderm and mesoderm of an animal.
• he main difference between archenteron and blastocoel is that
the archenteron is the primitive gut that forms during gastrulation
whereas blastocoel is the cavity within the blastula that forms during
blastulation
6.
7.
8.
9. Why w called Spiral Determinate cleavage
• Spiral Determinate cleavage occured in protostomes and if cell division
occur cells are not aligned over one another rather then they aligned at an
angle and if these cells are seperated then they will die and not have potential
to develop into an organism
10. Trochophore and Dipleurula larvae
• Many protostomes developed tope shaped larvae called trochophore.
• Some deuterostromes possess bean shaped larvae called as deplurula larvae.
