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Mollusks
- Soft bodied animals that typically have an inner or outer shell
- Most will have a muscular foot that is used for movement, opening their shell or burying themselves in the sand
- The head region will usually contain mouth and sense organs such as eyes.
- A soft fold of tissue called the mantle covers most of the mollusks body
- The mantle produces the shell
Echinoderms
- An internal skeleton and Spiny skin
- Five part body plan
- A water vascular system
- Tube Feet
Cnidarians differ from mollusks because mollusks are defined as Bivalves. They are called Bivalves because they have two shells. Cnidarians such as Jelly Fish do not have shells which define a bivalve (mollusks).
Echinoderms are animals that are spiny skinned like:starfish, sea cucumbers, sea urchins, sand dollars, and brittle stars.
Mollusks are animals with very soft bodies, like cephalopods: squid, octopi, cuttlefish, gastropods: snails and slugs, and bivalves: clams, oyster, mussels, scallops, cockles.
~7th grader
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What is one way that cnidarians and mollusks differ?
Cnidarians have radial symmetry and specialized stinging cells called cnidocytes, while mollusks typically have bilateral symmetry and a muscular foot for movement.
How are cnidarians less complex than annelids or mollusks?
Cnidarians include jellyfish and corals. Cnidarians are less complex than annelids or mollusks because the latter have gills with many layers of tissue.
Which animal is not a arthopods?
Sponges, Cnidarians, Mollusks, and Echinoderms are not Arthropods.
Describe the main differences between the polyp form of the cnidarians and the medusa form?
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Are scorpions annelids flatworms mollusks arthropods cnidarians or echinoderm?
a scorpion is a Arthropods
Is a jellyfish a mollusk?
No, a jellyfish is a cnidarian.No, true jelly fish are cnidarians. However, the jelly grade may include species from the phylum mollusca.No, jellyfish are not mollusks. They are cnidarians.
Which have a greater number of species cnidarians or mollusks?
Mollusks win this one, with the 8 following species: Caudofoveata Aplacophora Polyplacophora Monoplacophora Bivalvia (bivalves) Scaphopoda Gastropoda Cephalopoda Cnidarians have the following 5 species (one extinct): Anthozoa Scyphozoa Cubozoa Hydrozoa Conulata - extinct
What are some resources from the ocean floor?
fish, mollusks, worms, crustaceans, echinoderms, sponges, tunicates and other cnidarians
Is the coral reef built by mollusks?
No, coral reefs are cnidarians. The reefs themselves are built by coral polyps. Coral reefs are considered cnidarians along with what you and I would commonly refer to as jellyfish. Sea anemones are also cnidarians.
Difference between cnidarians and corals?
There is none. Corals are cnidarians.
What are all of the invertibrate groups?
An invertebrate is an organism that lacks a backbone. The 6 groups of invertebrates are sponges, cnidarians, worms, mollusks, echinoderms and arthropods.
Where in the sea do cnidarians live?
the cnidarians live at the bottom of the sea ------- and the top of the sea, and everywhere in between...
