Diploblasty

Diploblasty is a condition of the

Diploblastic organisms are organisms which develop from such a blastula, and include Cnidaria and Ctenophora, formerly grouped together in the phylum Coelenterata, but later understanding of their differences resulted in their being placed in separate phyla.

The endoderm allows them to develop true

. This includes tissue associated with the gut and associated glands. The ectoderm, on the other hand, gives rise to the epidermis, the nervous tissue, and if present, nephridia.

Simpler animals, such as

, have one germ layer and lack true tissue organization.

All the more complex animals (from flat worms to humans) are

.

Groups of diploblastic animals alive today include jellyfish, corals, sea anemones and comb jellies.

See also

• Triploblasty

References