Animalscaretips
- What are the stages of a cnidarian?
- What is the dominant stage for sea anemones?
- Which is the dominant stage of Hydrozoans?
- What are the two stages of cnidarians?
- What is the dominant body form in the life cycle of a Scyphozoan?
- How do cnidarian colonies form?
- Which classes of Cnidaria have a planula larva stage?
- How do Cnidaria reproduce?
- What is the dominant form of a Cubozoa?
- What stage is dominant in the Aurelia life cycle?
- What is Actinula larva?
- What is the difference between Cnidocytes and nematocysts?
- How many openings do cnidarians have?
- Which of the following is found in the phylum Cnidaria?
What are the stages of a cnidarian?
There are two basic body plans in cnidarians. They are called the polyp and medusa. Both are shown in Figure below. The polyp has a tubular body and is usually sessile.
What is the dominant stage for sea anemones?
Class Hydrozoa-- the polyp phase is dominant and the medusa is reduced or absent from the life cycle.
Which is the dominant stage of Hydrozoans?
The dominant stage of the hydrozoan life cycle is the polyp, however most species exist as medusae at some point in their life cycle.
What are the two stages of cnidarians?
Cnidarians have separate sexes and many have a lifecycle that involves two distinct morphological forms—medusoid and polypoid—at various stages in their life cycles. In species with both forms, the medusa is the sexual, gamete-producing stage and the polyp is the asexual stage.
What is the dominant body form in the life cycle of a Scyphozoan?
Scyphozoa is a class of marine organisms under phylum Cnidaria. They have blind sac body plan, while umbrella like free swimming medusa form is dominant phase of life.
How do cnidarian colonies form?
Cnidarian Colonies
Some types of cnidarians are also known to form colonies. ... One polyp is filled with air to help the colony float, while several feeding polyps hang below with tentacles. The tentacles are full of nematocysts.
Which classes of Cnidaria have a planula larva stage?
Learn how coral spawn. planula, plural planulae, free-swimming or crawling larval type common in many species of the phylum Cnidaria (e.g., jellyfish, corals, and sea anemones).
How do Cnidaria reproduce?
Reproduction of Cnidarians
In general, polyps primarily reproduce asexually by budding, however, some produce gametes (eggs and sperm) and reproduce sexually. Medusae usually reproduce sexually using eggs and sperm. ... The planula then develops into a polyp that can reproduce either sexually or asexually.
What is the dominant form of a Cubozoa?
The life cycle of the class Cubozoa is dominated by the medusa form, which for them appears cube or square shaped, when viewed from above. Members of Cubozoa, Hydrozoa, and Scyphozoa are sometimes grouped together as "Medusozoa" because a medusa phase is present in all three (Fautin and Romano 1997).
What stage is dominant in the Aurelia life cycle?
Between the dominant adult medusa stage and the small and inconspicuous larval polyp stage, Aurelia jellyfish undergo the ephyra stage. The common and cosmopolitan moon jelly (A.
What is Actinula larva?
Definition of actinula
: a creeping larva of the hydroid generation of certain coelenterates (as Tubularia) that finally attaches and develops into a polyp.
What is the difference between Cnidocytes and nematocysts?
A cnidocyte is an explosive cell having within it a giant secretory organelle (organ) called cnida which is a characteristic of the phylum Cnidaria. A Nematocyst is a specialized sub-cellular organelle (part of the cell) present in cnidocyte. Thus, a nematocyst is essentially a part of a cnidocyte.
How many openings do cnidarians have?
Cnidarians have an incomplete digestive system with only one opening; the gastrovascular cavity serves as both a mouth and an anus.
Which of the following is found in the phylum Cnidaria?
Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.
