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This simplest of all the cnidaria has, it is true, a crown of tentacles round its mouth.
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There are four stems belonging to the coelenteria: the gastraeads ("primitive-gut animals"), sponges, cnidaria, and platodes.
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In most of the cnidaria and many of the annelids (worm-like animals) they remain unchanged throughout life.
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This we find in the lower cnidaria and worms, as well as in the more highly-developed molluscs, echinoderms, articulates, and vertebrates.
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The lowest form of the Cnidaria is also not far removed from the gastraeads.
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Their phylogeny has remained problematic, with studies placing them within either the Bilateria or Cnidaria.
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Cnidaria This lion's mane is the largest known jellyfish and belongs to the Cnidaria phylum.
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The lowest Cnidaria (the hydroid polyps) also are little superior to the Gastraeads in structure.
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Radiata, that include the phylum Cnidaria, have a blind-sac form of digestive tract with only one opening.
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These special excretory organs are not found in the other Coelenteria (Gastraeads, Sponges, Cnidaria) or the Cryptocoela.
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"Some noxious spray emitted by the malefic cnidaria as it murdered poor Marissa?"
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Until now, there is a lack of knowledge about the presence of chitin in numerous representatives of corals (Cnidaria).
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As I began to write this summary chapter, I therefore aimlessly searched through images of Cnidaria from my collection of antiquarian books in paleontology.
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Among the latter we might list Gnathostomulida (marine worms), Cnidaria (jellyfish, medusae, anemones, and corals), and the delicate Priapulida (or little "penis worms").