Are hollow-bodied animals that have stinging cells?
Nearly all (about 99 percent) cnidarians are marine species. Cnidarians contain specialized cells known as cnidocytes (“stinging cells”), which contain organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, serving to immobilize prey with toxins contained within the cells.
Which invertebrates have hollow tubes with many pores?
In addition to the osculum, sponges have multiple pores called ostia on their bodies that allow water to enter the sponge. In some sponges, ostia are formed by porocytes: single, tube-shaped cells that act as valves to regulate the flow of water into the spongocoel.
What are soft bodied animals called?
Invertebrates are generally soft-bodied animals that lack a rigid internal skeleton for the attachment of muscles but often possess a hard outer skeleton (as in most mollusks, crustaceans, and insects) that serves, as well, for body protection.
What are the main characteristics of invertebrates?
Invertebrates share four common traits:
- They do not have a backbone.
- They are multicellular.
- They have no cell walls, like all other animals.
- They reproduce by two reproductive cells, or gametes, coming together to produce a new organism of their species.
Is jellyfish hollow-bodied?
Answer: Explanation: Classes of hollow-bodied animals includes jellyfish, hydra, sea anemones and coral .
What do you call the hollow-bodied animals and have stinging cells or tentacles?
INVERTEBRATES WITH HOLLOW BODIES & STINGING CELLS. Phylum Cnidaria or Coelenterata. . These animals have hollow bodies with one opening. The body openings are surrounded by tentacles.
Are platyhelminthes sessile?
Why does a sessile animal need a motile larval stage? Phylum Platyhelminthes – flatworms, flukes and tapeworms; 18,500 sp. Because they are so flat, diffusion is sufficient for respiration, and flatworms lack respiratory and circulatory systems.
What are known as hollow-bodied or soft bodied invertebrates?
commonly studied invertebrate phyla: – Sponges. – Hollow-Bodied animals. – Flatworms. – Roundworms.
What are animals without skeletons called?
Invertebrates are animals without a backbone or bony skeleton.
Is a frog an invertebrate?
Animals can be further divided into two groups: Vertebrates and Invertebrates. A frog is a vertebrate. An earthworm is an invertebrate. Birds, frogs, horses are vertebrates.
Is an octopus an invertebrate?
The octopus is an invertebrate, meaning that it does not have a backbone. Octopuses, squid, cuttlefish, and nautiluses make up the cephalopod group (cephalopoda, from the Latin for “head-foot”).
What animals have hollow bodies?
