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. 1 июн. 2020 г.
Do roundworms have legs?
The Nematoda (roundworms) are very small worms with tapering ends. The Arthropoda, the largest and most successful phylum of organisms, are characterized by a tough exoskeleton and jointed legs.
What is the characteristics of roundworms?
Roundworms (nematodes) are bilaterally symmetrical, worm-like organisms that are surrounded by a strong, flexible noncellular layer called a cuticle. Their body plan is simple. The cuticle is secreted by and covers a layer of epidermal cells.
What is the body shape of a roundworm?
Roundworms (also called nematodes) are worms with a long round body. They vary in length from several millimetres to up to two metres.
Do roundworms have appendages?
Nematodes (roundworms) are colorless, unsegmented, and do not have appendages. Nematodes may be free-living, predaceous, or parasitic, and many of the parasitic species cause important diseases of plants, animals, and humans.
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