Cnidarians

Cnidarians are aquatic animals belonging to the phylum Cnidaria. Common cnidarians include to jellyfish, sea anemones, corals and the Portuguese Man o' War. Questions about all species of cnidarians can be directed here.

2,438 Questions
Zoology or Animal Biology
Invertebrates
Cnidarians

What are characteristic of coelenterate?

Coelenterata is old term , now this phyllum is divided in two different phylla i.e. Cnidaria and Acnidaria .

distinguishing characters of colenterata were

1 : presence of coelenteron

2 : presence of stinging cells

3 ; presence of tentacles .

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Biology
Cnidarians

How long have cnidarians been on earth?

The earliest animal fossils where rather modern-looking cnidarians, possibly from around 580 millionyears ago. They've been around for a long time!

The earliest animal fossils where rather modern-looking cnidarians, possibly from around 580 millionyears ago. They've been around for a long time!

They are present in fossils form since Cambrian times , and were present in Proterozoic Era .

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Engineering
Buildings
Cnidarians

What is an hydra form wall?

A Hydraform wall is a wall that is built using the Hydraform building blocks. Hydraform blocks are interlocking building blocks that is produced using a Hydraform block machine. Hydraform block machines utilises compressed earth method in creating building blocks, soil and cement is mixed and then compressed using the machine to manufacture high quality stabilised building blocks. Blocks are intelocking and require up to 70% less mortar than conventional bricks or blocks.

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Cnidarians

What type of symmetry do the hydra display?

it displays radial symmetry but somone needs to answer how does a hydra display radial symmetry. pleze

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Cnidarians

What are example of coelenterata?

sea anemones, hydra, corals, jelly fish

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Mollusks
Cnidarians

Is a sea urchin a cnidarian?

No, it's an echinoderm.

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Invertebrates
Cnidarians

What are cnidarians' adaptations?

One adaptation of a cnidarian is the ability to regrow an entire body part. They also use stinging tentacles to catch prey. Jellyfish are cnidarians.
Adaptations? Stinging tentacles (cnidoblasts) - pronounced nie-doe-blasts - sensitivity to light, pulsing motility, life cycle stages that take advantage of protected and food rich environments.

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Botany or Plant Biology
Genetics
Cnidarians

Is hydra an animal or plant cell?

It is not a single cell. It if a fully developed animal. It's a very cool one at that. It has stinging cells and tentacles with which it catches its prey. It can swim around or attach itself to something and stay there. It swallows its prey whole. Since it has only two layers of cells if you have one you can see through it and watch its prey being digested. How cool is that?

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Animal Life
Cnidarians

Do cnidaria have notochords?

No, notochord is only present in the chordates phylum. The only kind of support cnidaria possess is a hydrostatic skeleton like in most soft-bodied animals.

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Jellyfish
Cnidarians

How do you describe a cnidarian?

An animal that exists in a mudusa or poylp state.

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A cnidarian is defined by the root of its name, cnida, which is Greek for stinging nettle. All cnidarians, therefore, have cnidocytes, which are the stinging, adhering, or entangling cells that allow them to eat, defend, or move. It is diploblastic (two layered) and generally they are radially symmetric. Cnidarians are also exclusively aquatic.

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Science
Biology
Cnidarians

What form of asexual reproduction is hydra?

budding external

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Gorillas
Cnidarians

What phylum has nematocysts?

Phylum Cnidaria

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Chemistry
Cnidarians

How can you describe a hydra?

The Hydra

The Hydra was a water serpent with nine heads and very poisonous acidic breath. One Head was Immortal. For Hercules' second Labor, he had to kill this beast. Unfortunately, every time he cut off one of the Hydra's heads, two more grew in its place. Hercules overcame this by dipping his sword in the venom of one of the severed heads so that every time he cut a head off, none could grow back. Hera (who hated Hercules) was mad at this so she sent a giant crab to help the Hydra. Hercules crushed it underneath one of his large feet. Finally he cut the immortal head off and (because it was still alive) put it under a rock on the sacred way from Lerna to Elaius. Hera put the crab in the sky as the constellation Cancer so it wouldn't be forgotten.

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Constellations
Cnidarians

How many stars are in the constellation hydra?

18 is the stars of the constellation hydra

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Cnidarians

What kind of symmetry does a hydra have?

The Hydra has radial symmetry

818283
Biology
Cnidarians

How do tentacles function on a hydra?

there is no function. asians use them for their tentacle porn though.

757677
Biology
Digestive System
Cnidarians

Where are the digestive enzymes of Hydra produced?

In the GastroVascular Cavity

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Social Sciences
Cnidarians

What is the Hydra?

Generically, Hydra are small, simple, fresh-water animals that can reproduce asexually by budding or sexually by producing sperm and eggs. They have tube-like bodies and a number of tentacles that contain stinging cells called cnidocytes that they use to catch their prey. They have radial symmetry. Hydras are predatory animals belonging to the phylum Cnidaria and the class Hydrazoa. They are related to such things as jellyfish and coral.

Specifically, THE Lernean Hydra was a serpent-like creature from Greek Mythology. It was an ancient water beast that possessed many heads and poisoned breath. It lived in the lake of Lerna in the Argolid, the site of the myth of Danaids. It was yet another offspring of Echidna and Typhoon, the children of Gaia, the goddess of Earth. Heracles, sometimes called Hercules, tried to slay the beast, but found that every time that he cut off one of it's heads, two more grew in it's place. Realizing this, his nephew told him to scorch the neck stumps with a burning firebrand after he cut off each head. Hercules tried this with every one of the heads, and eventually succeeded in destroying the monster.

Also, Hydra is also one of Pluto's moons (named after the mythological beast).

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Animal Behavior
Microbiology
Oceans and Seas
Cnidarians

What do sea anemone eat?

Crabs,sea urchins,isopods,amphipods,plankton,and small fish basically whatever they can catch.

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Jellyfish
Cnidarians

What do cnidarians use to catch food?

Cnidereans have pressure-sensitive poison glands called nematocysts that are usually on their tentacles. When their [prey] touches these nematocysts, small "fangs" inject poison into the [prey]. The poison in the nematocysts can paralyze or even kill small animals. Once the prey is subdued, the tentacles pull the prey towards the mouth.

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Definitions
Cnidarians

What does 'hydra-headed evils' mean?

In present time, hydra-headed evils refer to the different aspects that can occur from a problem that's difficult. In Greek Mythology a Hydra-headed evil is a seven-headed monster that Hercules kills in Lake Lerna. When he tried to cut off one of its head another immediately grew back in its place.

mythology owns!

555657
Animal Health
Cnidarians

What color is the blood of a hydra?

This is a trick question. Because hydras are only two cell layers thick, they do not have a true circulatory system. The inner cell layer absorbs materials directly from their gastrovascular cavity. So a hydra doesn't have blood!

323334
Biology
Cnidarians

What kind of structure do cnidarians have?

CnidariaCnidaria is a phylum containing some 11,000 species of relatively simple animals found exclusively in aquatic, mostly marine, environments. Cnidarians get their name from cnidocytes, which are specialized cells that carry stinging organelles. The corals, which are important reef-builders, belong here, as do the familiar sea anemones, jellyfish, sea pens, sea pansies and sea wasps. The names Coelenterata and Coelentera were formerly applied to the group, but as those names included the Ctenophores (comb jellies), they have been abandoned. Cnidarians are highly evident in the fossil records, having first appeared in the Precambrian era.
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Cnidarians

Is the sea anemone a living thing?

yes sea anemone is a living animal

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Microbiology
Cnidarians

What is the size of the Hydra?

If your talking about the fresh water hydra, then it is a few millimeters tall and is best examined using a microscope

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