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Which structure is used by hydrozoans to attach themselves to rocks?
This is the basal disc. It is useful in helping the hydrozoans stick to and stay on the rocks around them.
What major difference distinguishes the life cycles of hydrozoans and anthozoans?
Anthozoans have both a free-swimming medusa stage and a stationary polyp stage. Hydrozoans have only a polyp stage.
What other animals in the same class as a jellyfish?
Hydrozoans, sea anemones, & corals
Do any jellyfish live in fresh water?
Scyphozoans are exclusively marine, but some hydrozoans live in freshwater.
What are three major classes of cnidarians?
The three major classes of cnidarians are hydrozoans, jellyfish, and sea anemones and corals.
How will you distinguish between hydrozoan polyp and scyphozoan polyp?
The difference between most hydrozoans and most scyphozoans is that in hydrozoans, the polyp stage usually predominates, with the medusa small or sometimes absent.Often, the medusa never breaks away from the parent polyp, and remains in a state of arrested development, although its gametes function. Such a medusa is referred to as a sporosarc.In scyphozoans, the medusa stage is typically large and free-living, with the polyp stage small.However, there are exceptions - certain hydrozoans known as the Trachylina never form a polyp stage. Free-living medusoid hydrozoans can be hard to tell from scyphozoans, but hydrozoan medusae generally have a muscular shelf, or velum, projecting inward from the margin of the bell.This structure is not found in scyphozoans. Hydrozoans also lack cells in the mesoglea, the jelly layer found between the basic cell layers, whereas scyphozoans contain amoeboid cells in the mesoglea.Another feature that is quite common in Hydrozoa but not typical of Scyphozoa is colonial organization.
What kinds of cnidarians are there?
Jellyfish, hydras, sea pens, corals, hydrozoans, cubozoans, anthrozoans, anemomes, and possibly some parasites.
Do jellyfish live in fresh sea water or salty sea water?
Scyphozoans are exclusively marine, but some hydrozoans live in freshwater.
Which phyla have only two germ layers?
Phyla that have only two germ layers are Cnidaria and Ctenophora. These phyla are considered diploblastic, meaning they develop from two embryonic germ layers: endoderm and ectoderm. organs. This is in contrast to triploblastic animals, which have three germ layers (endoderm, mesoderm, and ectoderm).
How do hydras differ from other cnidarians the class Hydrozoa?
Most hydras alternate between an asexual polyp stage and a sexual medusa stage, though the best-known Hydrozoan, Hydra, never becomes a medusa, spending its whole life as a polyp.
What class are jellyfish in?
A jellyfish is the medusoid stadium of animals belonging to phyum Cnidaria, subphylum Medusozoa, which include:class: Scyphozoaclass: Cubozoaclass: Staurozoaclass: Hydrozoa (only some hydrozoans have a medusoid stadium, so not all of them have jellyfishes)class: Polypodiozoa
What is the characteristic of phylum coelentarata?
They include jellyfish and coral. The main types are scyphozoans, hydrozoans and anthozoans. Look up cnidarians as well. They are distinguished by their life cycle. Some are anchored to a sea floor, others float free and go through various larval stages.
