Roundworms have a tough covering of cuticle on the surface of their body. It prevents their body from expanding. This allows the buildup of fluid pressure in the pseudocoelom. As a result, roundworms have a hydrostatic skeleton. 5 мар. 2021 г.
Do roundworms have limbs?
This informal term describes animals (usually invertebrates) that have long bodies with no arms or legs. Worms with round, non-segmented bodies are known as nematodes or roundworms (Figure below). They are classified in the phylum Nematoda, which has over 28,000 known species.
Are roundworms jointed?
Most roundworms are parasitic in nature. They have a tubular digestive system with openings at both ends. They do not possess any jointed appendages.
Do roundworms have invertebrates?
Roundworms are invertebrates in Phylum Nematoda. This is a very diverse phylum. It has more than 80,000 known species.
Do roundworms have a body cavity?
Roundworms have a fluid-filled body cavity, that is lined on the outside by tissue derived from mesoderm. Such a cavity is called a pseudocoelom.
More useful articles on a similar topic 👇
What is the difference between roundworms and tapeworms in cats?Why do roundworms have a round body?