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Protozoans are also strictly non-multicellular and exist as either solitary cells or cell colonies. Nevertheless, some colonial organisms (e.g., Dictyostelium discoideum, supergroup Amoebozoa) exhibit high levels of cell specialization that border on multicellularity.
Aschelminthes are pseudocoelomate, unsegmented worms that are covered with a cuticle. An unusual aschelminth trait is parthenogenesis (development of an unfertilised egg). In the classes Nematoda, Rotifera and Gastrotricha, males may be lacking and successive generations of females are produced parthenogenetically.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.