Six different classes, dominated by the Class Nematoda, represent Aschelminthes as a phylum. The nematodes (Nema, thread) or roundworms are ubiquitous small worms that dwarf in numbers all other groups of multicellular animals except insects and mites.n hookworms, the mouth is armed with teeth or cutting plates. Some nematodes are provided with lips, papillae or a leaf crown around the external opening of the mouth. The pharynx (oesophagus) is a strong muscular tube with walls that can contract and expand, creating a pump-like suction mechanism.
Wiktionary(0.00 / 0 votes)Rate this definition: squad(Noun) A group of people organized for some common purpose, usually of about ten members. squad(Noun) A unit of tactical military personnel, or of police officers, usually of about ten members.
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