What are the two body plans in phylum Cnidaria?

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 plan of an anemone?

The anemone’s body plan is basically a sac attached to the bottom with a mouth surrounded by a ring of tentacles to catch prey. This serves the anemone well, for it can catch prey coming from all sides.

What is the basic body plan of the cnidarians quizlet?

A group of organisms with radial symmetry and two body structure (polyp and medusa), and have a nerve net and stinging cells in their tentacles. What is the basic cnidarian body plan? A sac with a central digestive compartment, the gastrovascular cavity.

What are the two basic body plans?

There are two basic body plans in cnidarians. They are called the polyp and medusa.

Is Coral a polyp or medusa?

Classes. In the class Anthozoa, comprising the sea anemones and corals, the individual is always a polyp; in the class Hydrozoa, however, the individual may be either a polyp or a medusa, with most species undergoing a life cycle with both a polyp stage and a medusa stage.

What are the 4 functions of nematocysts?

Nematocysts are used by organisms for prey capture and feeding, but also for defense, transport, digestion and other various functions [3,4].

What is not a main feature of a cnidarians body plan?

They are diploblastic, they are radially symmetric, they are deuterostomes. or there are two basic body plans; they are either a polyp, a medusa, or both.

What are the types of body plans?

Animals can be classified by three types of body plan symmetry: radial symmetry, bilateral symmetry, and asymmetry.

What is the body plan of porifera?

The most simplistic body plan within the phylum porifera is the asconoid body plan. This is such a simplistic structure because the body plan has only one large internal chamber, called a spongocoel, that is lined with water-filtering choanocyte cells.

Does Coral have medusa stage?

The class Anthozoa includes all cnidarians that exhibit a polyp body plan only; in other words, there is no medusa stage within their life cycle. Examples include sea anemones, sea pens, and corals, with an estimated number of 6,100 described species.

What are the two body forms of cnidarians?

Cnidarians have two basic body forms, medusa and polyp. Medusae, such as adult jellyfish, are free-swimming or floating. They usually have umbrella-shaped bodies and tetramerous (four-part) symmetry. The mouth is usually on the concave side, and the tentacles originate on the rim of the umbrella.

What animals live in cnidarians?

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 .

What are some examples of cnidarians?

Examples of cnidarians. White jellyfish.

Anemones. Actinia equina.

Polyps. Solitary polyp of the Flabellum coral.

Corals. Acropora cervicitis.

General characteristics. Cnidarians have a series of specific characteristics that differentiate them from other living things: They have cells that are organized in two layers forming functional units.

What makes cnidarians unique?

The key characteristic features of cnidarians include radial symmetry, acoelomate body with tissues, lack of organs, and the simple digestive sac that opens through a mouth, which is surrounded by tentacles armed with nematocysts . All cnidarians are carnivores and have very simple body structures adapted as predators.