Zoology 10th Edition by Stephen Miller,John Harley

تمرين 12

Members of the phylum Ctenophora are the sea walnuts or comb jellies. They possess comb rows used in locomotion and tentacles with adhesive colloblasts that are used in prey capture. They are monoecoious with external fertilization resulting in the development of a ciliated larval stage.
Why do some zoologists believe that ctenophorans are triploblastic?