What is the segmentation for cnidarians?

Taxonomic level: phylum Cnidaria; grade of construction: two tissue layers; symmetry: radial; type of gut: blind gut; type of body cavity other than gut: none; segmentation: none; circulatory system: none; nervous system: network of nerve cells; excretion: diffusion from cell surface.

1. How are cnidarians classified?
2. What is the body structure of cnidarians?
3. What are three features common to cnidarians?
4. What are the 4 orders of Cnidaria?
5. How do cnidarians form colonies?
6. Are cnidarians Monoecious or dioecious?
7. What are the two main morphological patterns of cnidarians?
8. What are the two main morphological patterns of cnidarians concerning locomotion How are these forms different from each other?
9. What is the common adaptation of cnidarians?
10. Are Cnidaria unicellular or multicellular?
11. What are the distinct features of cnidaria?
12. How do cnidarians move?
13. Are cnidarians Colonial?
14. Are cnidarians carnivores?

How are cnidarians classified?

Cnidarians are classified into four main groups: non-moving (sessile) Anthozoa (sea anemones, corals, sea pens); Cubozoa (box jellies);swimming Scyphozoa (jellyfish); and Hydrozoa, a broad group that includes all the freshwater cnidarians as well as many marine forms. ... Cnidaria have no organs like hearts or lungs.

What is the body structure of cnidarians?

The body of a cnidarian consists of two cell layers, ectoderm and endoderm. The cellssurround a digestive cavity called the coelenteron (see Figure below). Cnidarians have a simple digestive system. The single opening is surrounded by tentacles, which are used to capture prey.

What are three features common to cnidarians?

All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea. Most Cnidarians have radial symmetry.

What are the 4 orders of Cnidaria?

Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans. The phylum Cnidaria is made up of four classes: Hydrozoa (hydrozoans); Scyphozoa (scyphozoans); Anthozoa (anthozoans); and Cubozoa (cubozoans).

How do cnidarians form colonies?

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.

Are cnidarians Monoecious or dioecious?

Depending on the species, cnidarians can be monoecious (also called hermaphroditic), with individuals capable of producing both eggs and sperm, or they can be dioecious, with individuals of separate sexes for gamete production.

What are the two main morphological patterns of cnidarians?

Cnidarians have two distinct morphological body plans known as polyp, which are sessile as adults, and medusa, which are mobile; some species exhibit both body plans in their lifecycle.

What are the two main morphological patterns of cnidarians concerning locomotion How are these forms different from each other?

Concerning locomotion, how are these forms different from each other? Morphologically, cnidarians are classified as polyps or medusae. Polyps are cylindrical and medusae are circular convex, like an umbrella. Both shapes have tentacles.

What is the common adaptation of cnidarians?

What is the common adaptation , which unites them into the common group of Cnidaria? Their ability to sting their prey. What language was the word Cnidaria derived from and what does the word mean? The language the word Cnidaria derived from is Greek and it means stinging nettle.

Are Cnidaria unicellular or multicellular?

Cnidaria, phylum of multicellular, radially symmetrical invertebrates (eg, hydroids, jellyfish, sea anemones, corals) dating to late Precambrian era (630-570 million years ago).

What are the distinct features of cnidaria?

Cnidarians have two distinct body plans, the medusa (a) and the polyp (b). All cnidarians have two membrane layers, with a jelly-like mesoglea between them. Two distinct body plans are found in Cnidarians: the polyp or tuliplike “stalk” form and the medusa or “bell” form (Figure 2).

How do cnidarians move?

How do cnidarians move? Since Cnidarians do not have a mesoderm, they do not have any true muscle. They move by epithelial muscular cells (cells in the epidermis that can contract and are made up myosin and actin. ... Cnidarians respire by diffusion and all cells are near the digestion cavity.

Are cnidarians Colonial?

Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp-like zooids, or both (hence they are trimorphic). Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors.

Are cnidarians carnivores?

All cnidarians are carnivores. Most use their cnidae and associated toxin to capture food, although none is known actually to pursue prey. Sessile polyps depend for food on organisms that come into contact with their tentacles.