What does the cniderian look like?

Cnidarians have two body forms—polyp and medusa—which often occur within the life cycle of a single cnidarian. Sea nettle (Chrysaora fuscescens). The body of a medusa, commonly called a jellyfish, usually has the shape of a bell or an umbrella, with tentacles hanging downward at the margin.

1. How do you identify a cnidarian?
2. What shape are cnidarians?
3. What is the body structure of a cnidarian?
4. What are the main features of cnidarians?
5. Is a sponge a cnidarian?
6. Which of the following is cnidarian?
7. Where are cnidarians located?
8. What symmetry does a cnidarian have?
9. What is the larva of a cnidarian called?
10. What is the mouth side of a cnidarian called?
11. How do cnidarians eat?
12. Which characteristics would place an organism into the phylum Cnidaria?
13. How do cnidarian colonies form?
14. What is Cnidaria known for?

How do you identify a cnidarian?

The Cnidaria display two basic structural types: 1) the sessile polyp, that is more or less cylindrical and has the mouth at the free distal end, with a thin mesogloea; 2) the free swimming medusa, that is saucer- or bell-shaped, with the convex surface upward and with the mouth and surrounding tentacles at the under ...

What shape are cnidarians?

There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.

What is the body structure of a cnidarian?

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 the main features of cnidarians?

Cnidarians share several basic characteristics. 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.

Is a sponge a cnidarian?

Sponges belong to Phylum Porifera. Cnidarians belong to Phylum Cnidaria.

Which of the following is cnidarian?

cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.

Where are cnidarians located?

Cnidarians can be found in almost all ocean habitats. They may live in water that is shallow or deep, warm or cold. A few species live in freshwater. Some cnidarians live alone, while others live in colonies.

What symmetry does a cnidarian have?

Radial symmetry (sort of)

Illustration of radial body symmetry in a sea anemone. Each plane of symmetry divides the sea anemone into a half that is the mirror image of the other half. All cnidarians have this type of symmetry.

What is the larva of a cnidarian called?

planula, plural planulae, free-swimming or crawling larval type common in many species of the phylum Cnidaria (e.g., jellyfish, corals, and sea anemones). The planula body is more or less cylindrical or egg-shaped and bears numerous cilia (tiny hairlike projections), which are used for locomotion.

What is the mouth side of a cnidarian called?

Cnidarians take on two basic forms, a medusa and a polyp. The medusa form is a free-swimming structure which consists of an umbrella-shaped body (called a bell), a fringe of tentacles that hang from the edge of the bell, a mouth opening located on the underside of the bell, and a gastrovascular cavity.

How do cnidarians eat?

All cnidarians are carnivores. Most use their cnidae and associated toxin to capture food, although none is known actually to pursue prey. ... The mouth opens, the lips grasp the food, and muscular actions complete swallowing.

Which characteristics would place an organism into the phylum Cnidaria?

Phylum Cnidaria includes animals that exhibit radial or biradial symmetry and are diploblastic, meaning that they develop from two embryonic layers, ectoderm and endoderm. Nearly all (about 99 percent) cnidarians are marine species.

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.

What is Cnidaria known for?

Cnidaria (/nɪˈdɛəriə, naɪ-/) is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.