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Coelenterata is a term encompassing the animal phyla Cnidaria (corals, true jellies, sea anemones, sea pens, and their relatives) and Ctenophora (comb jellies). The name comes from Ancient Greek κοῖλος (koîlos) 'hollow' and ἔντερον (énteron) 'intestine', referring to the hollow body cavity common to these two phyla.
This supports the placement of Polypodium within Cnidaria. [2] This accords with its traditional classification, in particular with the fact that Polypodium possesses nematocysts and a cnidarian-like body plan. [2] Myxozoans are currently classified as cnidarians as well. [4]
Pacific sea nettles, Chrysaora fuscescens. Cnidaria (/ n ɪ ˈ d ɛər i ə, n aɪ-/ nih-DAIR-ee-ə, NY-) [4] is a phylum under kingdom Animalia containing over 11,000 species [5] of aquatic invertebrates found both in fresh water and marine environments (predominantly the latter), including jellyfish, hydroids, sea anemones, corals and some of the smallest marine parasites.
Tubularia indivisa. The average height of an individual colony is 4–6 centimetres (1 + 1 ⁄ 2 – 2 + 1 ⁄ 2 inches) and the diameter of the polyp and tentacles is 1 cm (1 ⁄ 2 in).
Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005) – System for the scientific classification of gastropod mollusks; Taxonomy of the Gastropoda (Ponder & Lindberg, 1997) – Morphological system for the scientific classification of gastropod mollusks; Taxonomy of the Conoidea (Tucker & Tenorio, 2009) – Classification of cone snails and allies
Planulozoa is a clade of animals that includes the superphyla Cnidaria (jellyfish, hydrozoans, sea anemones, corals, etc.) and the Bilateria (all complex animals with bilateral symmetry, including arthropods, molluscs, vertebrates, etc.).
Obelia is a genus of hydrozoans, a class of mainly marine and some freshwater animal species that have both polyp and medusa stages in their life cycle. Hydrozoa belongs to the phylum Cnidaria, which are aquatic (mainly marine) organisms that are relatively simple in structure with a diameter around 1mm. [1]
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