Like sponges and cnidarians, ctenophores have two main layers of cells that sandwich a middle layer of jelly-like material, which is called the mesoglea in cnidarians and ctenophores; more complex animals have three main cell layers and no intermediate jelly-like layer. Hence ctenophores and cnidarians have traditionally been labelled diploblastic, along with sponges. Both ctenophores and cnidarians have a type of muscle that, in more complex animals, arises from the middle cell layer, and as a result some recent text books classify ctenophores as triploblastic, while others still regard them as diploblastic.
Ctenophores, cnidarians and what other group are labelled diploblastic?
sponges sponges sponges
Hence ctenophores and cnidarians have traditionally been labelled diploblastic, along with sponges.
Hence ctenophores and cnidarians have traditionally been labelled diploblastic, along with sponges.
Ctenophores, cnidarians and what other group are labelled diploblastic?