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The main features of nematodes. How can nematodes be described according to examples of representative species,...

The main features of nematodes. How can nematodes be described according to examples of representative species, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?

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Examples of representing beings: ascaris, hookworms, filaria, pinworms.

Basic morphology: cylindric (round) body, not segmented.

Type of symmetry: bilateral.

Germ layers and coelom: triploblastics, pseudocoelomates.

Digestive system: complete.

Respiratory system: respiration by diffusion.

Circulatory system: circulating fluid within the pseudocoelom.

Excretory system: excretory channels and excretory pore.

Nervous system: ventral and dorsal ganglial chord, primitive cephalization.

Types of reproduction: sexual.

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