Nematocysts in these organisms contain toxins thta are released when their cnidocil (nye-do-sil) is triggered.
The life cycle of organisms in this phylum include the planula stage. The anatomy of one form of these organisms includes the velum, which is absent in this phylum's class scyphozoa. The action of nectophores propel some members of this phylum. The mesoglia is thick in members of this phylum, whose mouth and anus point downwards. The sessile organisms in this phylum are called polyps. Nematocysts in these organisms contain toxins thta are released when their cnidocil (nye-do-sil) is triggered. Organisms in this phylum include the Portuguese Man o' War. For 10 points, name this phylum that contains sea anemones, coral, and jellyfish.
The life cycle of organisms in this phylum include the planula stage.
cnidaria [or cnidarians]