What characteristic is unique to the ctenophores?

Ctenophores are characterized by eight rows of cilia, which are used for locomotion. The cilia in each row are arranged to form a stack of combs, also called comb plates, or ctenes; thus the name ctenophore comes from the Greek, meaning “comb bearer”.

Which of the following are characteristics of ctenophores?

Which of the following are characteristics of ctenophores? Many species are bioluminescent. They possess colloblasts for prey capture. They move by coordinated beating of cilia.

What are the characteristics of Ctenophora that are different than Cnidaria?

The cnidarians can be either sessile or mobile. But, ctenophores are always mobile. The main difference between Cnidaria and Ctenophora is that Cnidaria exhibits radial symmetry whereas Ctenophora exhibits biradial symmetry. Both cnidarians and ctenophores possess sense organs such as statocytes and ocelli.

What are ctenophores commonly known as?

Various forms of ctenophores are known by other common names—sea walnuts, sea gooseberries, cat’s-eyes.

What type of symmetry do ctenophores have?

Ctenophores do not have radial or bilateral symmetry, they have rotational symmetry. There is no plane that divides them into mirror images, as in animals with bilateral or radial symmetry.

What are the common characteristics shared by cnidarians and ctenophores?

Similarities between Ctenophora and Cnidaria:
  • Biradial symmetry.
  • Simple organisation—lack of organ- systems. ADVERTISEMENTS:
  • Arrangement of different structures in oral-aboral axis.
  • Presence of branched coelenteron.
  • Presence of gelatinous mesoglea.
  • Net type nervous system. …
  • Presence of statocyst (sense organ).

What is the function of Ctenophora?

Almost all ctenophores function as predators, taking prey ranging from microscopic larvae and rotifers to the adults of small crustaceans; the exceptions are juveniles of two species, which live as parasites on the salps on which adults of their species feed.

What is difference between Coelenterata and Ctenophora?

Coelenterata has two subphyla namely cnidaria and Ctenophora. They are aquatic organisms. Cnidaria is a highly diverse group, which is a distinguishing feature called cnidocytes. Ctenophora is a less diverse group, which has comb plates.

What are the characteristics features of phylum Cnidaria?

What are \(5\) characteristics of Cnidarians? Ans: 1) They are characterized by the presence of stinging cells called Cnidoblast and a cavity called coelenterates, justifying the name Cnidaria and Coelenterata. 2) They are exclusively aquatic and marine. 3) They are radially symmetrical and diploblastic animals.

Why are ctenophores called comb jellies?

Comb jellies are named for their unique feature: plates of giant fused cilia, known as combs, which run in eight rows up and down their bodies. The combs act like tiny oars, propelling the comb jelly through the water.

What is the function of Ctenophora?

Almost all ctenophores function as predators, taking prey ranging from microscopic larvae and rotifers to the adults of small crustaceans; the exceptions are juveniles of two species, which live as parasites on the salps on which adults of their species feed.

Do ctenophores have a complete gut?

Ctenophores, one of the most basal branches in the tree of life, have been found to have a through-gut, complete with mouth and anus. Basal animals are surprisingly complex and simplification has been rampant in animal evolution.

How do ctenophores capture food?

Unlike cnidarians, with which they share several superficial similarities, they lack stinging cells. Instead, in order to capture prey, ctenophores possess sticky cells called colloblasts. In a few species, special cilia in the mouth are used for biting gelatinous prey.

How do ctenophores breathe?

Ctenophores have two major layers of cells: the epidermis (on the outside) and the gastrodermis (on the inside). Although they live in the water, they do not possess gills or lungs. Instead, they are able to “breathe” through the cells; i.e. oxygen and nutrients easily pass through the cell layers.

How do ctenophores move?

Ctenophores move through the water by beating their comb rows — they are the largest animals to move entirely by ciliary movements — but they also have a complex array of definitive muscle cells.

How do ctenophores swim?

Ctenophores swim by the synchronous beating of 8 comb rows made of thousands of fused cilia. As they refract light, the beating combs create shimmering waves. Unlike jellyfish, ctenophores do not have stinging cells.

Is Ctenophora a carnivorous?

All ctenophores are carnivorous. Hermaphroditic. Spawning occurs in the water column.

What are ctenophores give example?

Comb jellies/Lower classifications

Are ctenophores jellyfish?

Hundreds of jelly species live in oceans around the world, from shallow bays to the deep sea. Some even live in fresh water. The most common jellies are true jellyfish (cnidarians) and comb jellies (ctenophores). Most jellyfish have long stinging tentacles and have oral-arms that help catch and eat food.

Why are Ctenophora called sea walnuts?

They are named as Comb jellies, for their combs – the rows of cilia, lining their bodies that propel them through the ocean. They are walnut shaped and hence known as sea walnut.

What are comb plates in Ctenophora?

The tentacles of Ctenophores have meridonial bands with transversely arranged combs like structures. Comb-like eight ciliary plates on the body serve the purpose of locomotion. So, the correct answer is ‘Cilia for locomotion’.

How do ctenophores reproduce asexually?

A very few species can reproduce asexually. What is this? Eggs and sperm are shed into the water and after fertilisation an ovoid larvae develops, called a Cydippid larvae. This free swimming larvae grows naturally into a new Comb Jelly in most species.