Roundworms are characterized by a simple worm-like structure with a lack of features such as cilia or a well-defined head. They have an internal body cavity, called a pseudocoelom, which looks like a tube within a tube and runs the whole length of their bodies. 29 июл. 2019 г.
Do roundworms have a head and tail?
Worms have bilateral symmetry. Unlike sponges or cnidarians, worms have distinct head and tail ends. Worms are the simplest animals with a brain.
What does roundworm look like?
Roundworms are cylindrical and resemble pieces of cooked spaghetti: pale in appearance — white or light brown — with smooth, non-segmented bodies. Growing up to several inches long, they can be seen by the naked eye. If your cat has roundworms, you may notice worms in their feces or vomit.
What makes roundworms unique?
The two most prominent features that distinguish roundworms from flatworms are the presence of a pseudocoelom, or partially developed body cavity, and a complete digestive tract with two openings, a mouth and an anus.
What is the structure of a round worm?
In contrast to platyhelminths, nematodes are cylindrical rather than flattened; hence the common name roundworm. The body wall is composed of an outer cuticle that has a noncellular, chemically complex structure, a thin hypodermis, and musculature. The cuticle in some species has longitudinal ridges called alae.
