- 1 How are jellyfish and sea anemones different?
- 2 What characteristic is unique to jellyfish sea anemones and corals?
- 3 What are the key features of jellyfish and sea anemones?
- 4 What feature three features do jellyfish coral animals and sea anemones share that make them cnidaria?
- 5 Is it bad to touch sea anemone?
- 6 Do sea anemones feel pain?
- 7 What is the lifespan of a sea anemone?
- 8 Which class of cnidarians are the most dangerous to man?
- 9 Do sea anemones have teeth?
- 10 Is a jellyfish a mollusc?
- 11 Are there male and female jellyfish?
- 12 Why is Scyphozoan Medusa called jellyfish?
- 13 Is a hydra?
- 14 How does the sea anemone respond to stimuli?
- 15 Are coral and jellyfish classified together?
How are jellyfish and sea anemones different?
Unlike jellyfish, sea anemones do not have a medusa stage in their life cycle. A typical sea anemone is a single polyp attached to a hard surface by its base, but some species live in soft sediment and a few float near the surface of the water.
What characteristic is unique to jellyfish sea anemones and corals?
The characteristic that most distinguishes them, is their “cnidocytes” (whence comes the name). These are specialized, venomous cells, used to stun, capture, and hold prey. All cnidaria are aquatic animals, and most are marine.
What are the key features of jellyfish and sea anemones?
Jellyfish are invertebrates that, together with corals, gorgonians and anemones belong to a group called the cnidarians (knidé = nettle, from the Greek). This animal group has stinging cells which they use both to capture their prey and as a form of defense.
Polypoid cnidarians have tentacles and a mouth that face up (think of an anemone or coral ). These animals are attached to a substrate or colony of other animals. Medusoid types are those like jellyfish —the “body” or bell is on top and tentacles and mouth hang down.
Is it bad to touch sea anemone?
Human skin is coated with oils and bacteria, which can damage marine wildlife such as corals and sea anemones. Black-band and brown-band diseases spread easily among coral colonies, and these bacteria may hitch a ride on hands touching the wildlife.
Do sea anemones feel pain?
Mather (2008) has speculated, based on this behavioural flexibility, that they may have simple consciousness. Researchers have catalogued octopus responses to the stinging nematocysts of Cnidarian sea anemones, which cause pain sensations in humans.
What is the lifespan of a sea anemone?
“How long do they live?” Some sea anemones are very long lived and have been known to reach 60-80 years. Because anemones are able to clone themselves they do not age and therefore have the potential to live indefinitely in the absence of predators or disease.
Which class of cnidarians are the most dangerous to man?
Cubozoa. The most dangerous to humans of all the cnidarians on this list is the cubozoa, a class of box jellyfish that carry toxins potent enough to kill multiple adults in minutes, or deliver an excruciatingly painful injury at the very least.
Do sea anemones have teeth?
The sea anemone is a member of a 10,000-strong group of simple animals called the cnidarians, whose ranks also include jellyfish and corals. They are soft-bodied animals that lack any hard parts like teeth or gizzards for crunching through the hard coatings of their prey, from shelled crustaceans to scaly fish.
Is a jellyfish a mollusc?
Jellyfish are found all over the world, from surface waters to the deep sea. Scyphozoans (the “true jellyfish “) are exclusively marine, but some hydrozoans with a similar appearance live in freshwater.
Are there male and female jellyfish?
In fact most jellyfish don’t bother with mating. In many species, there aren’t even males or females as such. Even when they do separate into distinct sexes, they have sex in the simplest way possible. Males and females simply release their sperm and eggs into the water in huge numbers.
Why is Scyphozoan Medusa called jellyfish?
The Scyphozoa are an exclusively marine class of the phylum Cnidaria, referred to as the true jellyfish (or “true jellies”). The class name Scyphozoa comes from the Greek word skyphos (σκύφος), denoting a kind of drinking cup and alluding to the cup shape of the organism.
Is a hydra?
Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). The body of such an organism consists of a thin, usually translucent tube that measures up to about 30 millimetres (1.2 inches) long but is capable of great contraction.
How does the sea anemone respond to stimuli?
How does the sea anemone respond to stimuli? The sea anemone has a very simple nervous system; if you touch part of the sea anemone, the entire animal contracts. For example, if you touch a tentacle, the anemone quickly withdraws all tentacles into its ﬂeshy polyp.
Are coral and jellyfish classified together?
Corals, sea anemones and jellyfish all belong to the same large group of animals – cnidarians. The name comes from the Greek ‘knide’, meaning nettle – they carry a sharp sting in their tentacles.