Difference between protiro stomia and deutero stomia
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Two major divisions of the Bilateria (Protostomia and Deuterostomia) exhibit many differences:
1) Origin of mesoderm is from very different cell types:
mesenchyme cells (non-epithelial) migrate in (Protostomia)epithelial cells inpocket from archenteron (Deuterostomia)
2) Origin of coelom is via two different mechanisms:
enterocoely outpockets from archenteron close off and form enclosed, mesodermally lined coelom (Deuterostomia)schizocoely: mesenchyme cells proliferate into balls of cells that then 'split' to form mesodermally lined coelom (Protostomia)
3) Origins of mouth and anus differ. The blastopore gives rise to the:
mouth; the anus arises secondarily (Protostomia)anus; the mouth arises secondarily (Deuterostomia)
4) Other differences include:
PROTOSTOMIA:spiral and determinate cleavagemulticiliated cells
DEUTEROSTOMIA:radial and indeterminate cleavage (primitive state)monociliated (primitive state)
5) Membership in the Deuterostomia and Protostomia is in a state of flux:
deuterostomes may only include echinoderms, hemichordates and chordates; the remaining bilaterian phyla may all be protostomes or be split into two groups: protostomes and lophophorates (stay tuned!)
1) Origin of mesoderm is from very different cell types:
mesenchyme cells (non-epithelial) migrate in (Protostomia)epithelial cells inpocket from archenteron (Deuterostomia)
2) Origin of coelom is via two different mechanisms:
enterocoely outpockets from archenteron close off and form enclosed, mesodermally lined coelom (Deuterostomia)schizocoely: mesenchyme cells proliferate into balls of cells that then 'split' to form mesodermally lined coelom (Protostomia)
3) Origins of mouth and anus differ. The blastopore gives rise to the:
mouth; the anus arises secondarily (Protostomia)anus; the mouth arises secondarily (Deuterostomia)
4) Other differences include:
PROTOSTOMIA:spiral and determinate cleavagemulticiliated cells
DEUTEROSTOMIA:radial and indeterminate cleavage (primitive state)monociliated (primitive state)
5) Membership in the Deuterostomia and Protostomia is in a state of flux:
deuterostomes may only include echinoderms, hemichordates and chordates; the remaining bilaterian phyla may all be protostomes or be split into two groups: protostomes and lophophorates (stay tuned!)
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