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.
Here is a rundown of the various elements of command in the U.S. Army (information derived from Army Operational Unit Diagrams): Squad/section. A squad, which is the smallest element in the Army structure, is typically made up of four to 10 soldiers and normally is commanded by a sergeant or staff sergeant. Some units have two squads that made up a section, commanded by a staff sergeant.