anything notable about its skeletal system?
In medusae the only supporting structure is the mesoglea. "Hydra" and most sea anemones close their mouths when they are not feeding, and the water in the digestive cavity then acts as a hydrostatic skeleton, rather like a water-filled balloon
Cnidaria
In medusae the only supporting structure is the mesoglea. "Hydra" and most sea anemones close their mouths when they are not feeding, and the water in the digestive cavity then acts as a hydrostatic skeleton, rather like a water-filled balloon. Other polyps such as "Tubularia" use columns of water-filled cells for support. Sea pens stiffen the mesoglea with calcium carbonate spicules and tough fibrous proteins, rather like sponges.
what are the 5 main features of cnidarians Cells bound by inter-cell connections and carpet-like basement membranes; muscles; nervous systems; and some have sensory organs. what type of specimen is this? It is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments
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Cnidaria [SEP] Skeletons
In medusae the only supporting structure is the mesoglea. "Hydra" and most sea anemones close their mouths when they are not feeding, and the water in the digestive cavity then acts as a hydrostatic skeleton, rather like a water-filled balloon. Other polyps such as "Tubularia" use columns of water-filled cells for support. Sea pens stiffen the mesoglea with calcium carbonate spicules and tough fibrous proteins, rather like sponges. In some colonial polyps, a chitinous periderm gives support and some protection to the connecting sections and to the lower parts of individual polyps. Stony corals secrete massive calcium carbonate exoskeletons. A few polyps collect materials such as sand grains and shell fragments, which they attach to their outsides.