Are comb jellies cnidarians?

Asked By: Mukhtar Zidaurre | Last Updated: 8th June, 2020
Category: pets fish and aquariums
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Comb jellies are part of a small phylum allied to the cnidarians and similar to them in many ways. They are radially symmetrical like a cnidarian medusa, the body is mostly water, and they capture their prey in a somewhat similar manner with tentacles.

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Also asked, how are comb jellies different from cnidarians?

The combs act like tiny oars, propelling the comb jelly through the water. Many microscopic organisms, such as bacteria, also use cilia to swim—but comb jellies are the largest known animals to do so. They are armed with sticky cells (colloblasts) and unlike jellyfish, the tentacles of comb jellies don't sting.

One may also ask, are comb jellies bioluminescence? Ctenophore is a small and absolutely beautiful creature. Known as comb jellies, they use eight longitudinal rows of cilia for locomotion. Some species of comb jellies (like so many animals in the deep sea) make their own light, called bioluminescence. All comb jellies are carnivores.

Also to know, why are comb jellies not cnidarians?

Comb jellies are mistaken for jellyfish due to their clear, gelatinous form. The comb jelly is from the Ctenophora phylum and the jellyfish comes from the Coelenterate (Cnidaria) phylum, which includes hydroids, sea anemones, and coral.

What phylum are comb jellies in?

Phylum Ctenophora

39 Related Question Answers Found

Can humans eat jellyfish?

Some species of jellyfish are suitable for human consumption and are used as a source of food and as an ingredient in various dishes. Edible jellyfish is a seafood that is harvested and consumed in several Asian and Southeast Asian countries, and in some Asian countries it is considered to be a delicacy.

Why do so many jellyfish wash up on shore?

It's mainly because tidal pressure isn't strong enough to push them further inland. Therefore, they tend to wash up on the beach. No, seriously: jellyfish tend to be rather delicate creatures.

Can Jellyfish think?

Do these behaviors mean jellyfish are self-aware? They don't have any type of 'centralized' nervous system. As far as anyone knows the two nerve nets and rhopalia do all the heavy lifting as far as 'thinking' goes. Ten years ago I would have said that no brain is evidence enough that they're not really aware.

How long does a jellyfish live?

One of the most popular jellyfish, the moon jellyfish (Aurelia aurita), is known to have a lifespan of 12 to 18 months but with proper living conditions, can live up to 20 years. The Flame jellyfish (Rhopilema esculentum) has a rather shorter lifespan as it can only live from three months up to a maximum of one year.

Do jellyfish have hearts?


Jellyfish do not have brains. They don't have a heart either. But jellyfish do have a very basic set of nerves at the base of their tentacles. These nerves detect touch, temperature, salinity etc.

How do you eat jellyfish?

You can eat jellyfish in many ways, including shredded or sliced thinly and tossed with sugar, soy sauce, oil, and vinegar for a salad. It can also be cut into noodles, boiled, and served mixed with vegetables or meat. Prepared jellyfish has a delicate flavor and surprisingly crunchy texture.

Why do jellyfish glow?

Aequorea jellies glow with a bioluminescent protein used in the biotechnology industry. Bioluminescence is light produced by a chemical process within a living organism. The glow occurs when a substance called luciferin reacts with oxygen. This releases energy, and light is emitted.

Do jellyfish die?

Scientists have discovered a jellyfish which can live forever. Turritopsis dohrnii is now officially known as the only immortal creature. It turns out that once the adult form of the 4.5 mm-wide species Turritopsis dohrnii have reproduced, they don't die but transform themselves back into their juvenile polyp state.

Do Ctenophores have eyes?

Ctenophores such as Pleurobrachia pileus, nicknamed “sea gooseberry or cat's eyes”, has tentacles which they can entirely retract into inner pockets of their body. These tentacles, on which the colloblasts are located, enable them to move the food back to their mouth.

What organs do jellyfish have?


A jellyfish's body generally comprises six basic parts:
  • The epidermis, which protects the inner organs.
  • The gastrodermis, which is the inner layer.
  • The mesoglea, or middle jelly, between the epidermis and gastrodermis.
  • The gastrovascular cavity, which functions as a gullet, stomach, and intestine all in one.

Are comb jelly still alive?

According to a new study, the comb jelly the world's oldest living animal. The sponge has long been a favorite for the title due to its extremely simple body structure. The comb jelly won due to its higher phylogenetic signals. Researchers add it also has more related species on Earth.

Why do jellyfish exist?

Jellyfish exist because they are suited to their environment. Their “purpose” is to reproduce and continue their line; in the final analysis, every other function (eating, defense, movement, etc.) is in service of reproduction.

Are comb jellyfish edible?

This comb jelly is a voracious carnivore and a major predator of edible zooplankton consuming up to 10 times its weight per day. It prefers a broad-based diet of zooplankton including eggs and larval forms of various invertebrates and fishes, juvenile fish, copepods, sea jellies, and even other ctenophores.

Why are Ctenophores no longer in the cnidarian phylum?

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 comb jellies reproduce?

Spawning occurs at night when water temperatures warm to 66-73 degrees. Comb jellies have both male and female reproductive organs and can fertilize themselves. Each comb jelly releases about 8,000 eggs per spawn. Unlike jellyfish, comb jellies develop without distinctive larval and polypoid stages.

Why do comb jellies use bioluminescence?

Most jellyfish bioluminescence is used for defense against predators. Jellyfish such as comb jellies produce bright flashes to startle a predator, others such as siphonophores can produce a chain of light or release thousands of glowing particles into the water as a mimic of small plankton to confuse the predator.