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Development of Vertebrates

Describe the differences and similarities in the development of invertebrates and vertebrates.

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1.Compare and contrast the protostomes and deuterostomes.

Protosomes Deuterosomes
Blastopore becomes mouth & 2nd opening becomes anus Blastopore becomes anus & 2nd opening becomes mouth
Coelom formed via schizocoely Coelom formed via enterocoely
spiral, determinate cleavage at 4 —> 8 cell division radial, indeterminate cleavage at 4 —> 8 cell division
circulatory system primitively dorsal and nervous system primitively ventral circulatory system primitively ventral and circulatory system primitively ventral
Phyla Mollusca, Annelida, Arthropoda and others Phyla Echinodermata, Hemichordata, Chordata and other

2. Describe the enterocoel hypothesis of coelom origin and discuss the implications.
Enterocoelous development is the stage of embryological development of deuterostomes in which the coelom forms. The stage starts with the gastrula; as the archenteron forms, pockets of migrating cells also form, creating another layer between the endoderm and ectoderm, the mesoderm. These pockets gradually expand to form the coelom.
Enterocelous development is advance in comparison to schizocoelous development due to the formation of the archenterons.
3. Why was the development of a true coelom such an important step ...

Solution Summary

Enterocoelous development is the stage of embryological development of deuterostomes in which the coelom forms. The stage starts with the gastrula; as the archenteron forms, pockets of migrating cells also form, creating another layer between the endoderm and ectoderm, the mesoderm. These pockets gradually expand to form the coelom.

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