What is the difference between protostomes and deuterostomes??

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Solution

PROTOSTOMES DEUTEROSTOMES

1. Protostomes includes primitive invertebrates like annelida, arthropods, molluscs etc 1. Deuterostomes includes echinodermes, chordates and hemichordates etc.

2. Here, in the early embryo stages the mouth opening is formed first followed by the anus 2. Here, anal opening is formed first followed by the mouth.

3.Cleavage is spiral and determinate type 3. Cleavage is radical and indeterminate type

4. Nerve cord is ventral 4. Nerve cord is dorsal .

5. Formation of mesodermal tissues is by division of single blastomere cell. 5. Mesodermal tissue formed by the outgrowth of endodermal wall

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