Terms in this set (5)
- 5 main features of cnidarians. soft bodied, carnivorus, with stinging tentacles, body symmetry, and specialized tissue.
- 3 groups of cnidarians. jellyfish, hydras (and relatives), and sea anemones and coral.
- human activities that hurt coral.
Which of the following is not a characteristic of a cnidarian?
1 Expert Answer. Answer: *Cnidarians are NOT deuterostomes. Explanation: Cnidarians include Hydrozoa (tiny freshwater and marine invertebrates), Cubozoa (such as Box Jellyfish), Scyphozoa (like Jellyfish), and Anthozoa (includes sea anemones and coral).
What characteristic is shared by Cnidaria and platyhelminthes?
The phylum Cnidaria are invertebrates that have radial symmetry but the flatworms or the Platyhelminthes have a bilateral symmetry. The characteristic common among them is that they have a digestive cavity with a single opening….
Which body structure describes the freshwater hydra?
Hydra are inconspicuous freshwater relatives of corals, sea anemones and jellyfish. All are members of the phylum Cnidaria, characterized by radially symmetrical bodies, presence of stinging tentacles and a simple gut with only one opening (gastrovascular cavity).
What type of organism is Hydra?
Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). The body of such an organism consists of a thin, usually translucent tube that measures up to about 30 millimetres (1.2 inches) long but is capable of great contraction.
Is Adamsia a medusa or polyp?
Hydrozoa, Cnidarians exhibit two basic body forms called polyp and medusa. The former is a sessile and cylindrical form like Hydra, Adamsia, etc. whereas, the latter is umbrella-shaped and free – swimming like Aurelia or jellyfish.
What is the life cycle of a jellyfish?
Jellyfish have a stalked (polyp) phase, when they are attached to coastal reefs, and a jellyfish (medusa) phase, when they float among the plankton. The medusa is the reproductive stage; their eggs are fertilised internally and develop into free-swimming planula larvae….