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The upcoming discussion will update you about the difference between embryological characteristics of Protostomes and Deuterostomes.
Difference # Protostomes:
1. Cleavage of Protostomes are spiral, determinate or mosaic. Bilateral-mosaic cleavage of some protostomes (e.g., nematodes).
2. In Protostomes, the blastopore either becomes the mouth, the anus forms a new structure (e.g., most of molluscs) or the blastopore gives rise to both mouth and anus (e.g., some molluscs, polychaetes, onychophores).
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3. In Protostomes, modes of mesoderm development is from mesentoblast (some-times called 4d; it indicates the blastomere in 8-cell stage and by proliferation, develops mesoderm).
4. Coelom formation in protostomes is schizocoely (splitting of mesodermal bands).
5. Type of larva of protostomes is trochophore.
Difference # Deuterostomes:
1. Cleavage of Deuterostomes is radial, inderminate or regulative of many deuterostomes. Bilateral-mosaic cleavage of some deuterostomes (e.g., sea squirts).
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2. In Deuterostomes, the blastopore usually be-comes the anus and mouth forms a new structure.
3. Deuterostomes develops as out-folds of the archenteron.
4. Coelom formation in Deuterostomes is enterocoely (coelom is segregated as epithelial out pockets of the archenteron).
5. Type of larva of deuterostomes is dipleurula.
