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• The group of annelids are invertebrate animals, with a soft and cylindrical body composed of rings. In addition to having a complete digestive system, a closed circulatory system with the presence of blood and bila teral symmetry.

A.)Name the groups and give examples of their representatives.

~They are classified into three groups:

• Oligochaetes: earthworm (lumbricus terrestris)
• Tubifex (Tubifex tubifex)
• Earthworm (Rhinodrilus alatus)
• Hirudines or Achaetas: Leech (hirudo medicinalis)
• Polychaetes: nereis; Phyllodoce rosea

B.) Assign to each group at least one characteristic. externally visible, which allows you to differentiate it from the others.

• Oligochaetes: Visual characteristic is short bristles and few
• Hirudines or Achaetas: Main visual characteristic is the fact that they do not have bristles
• Polychaetes: Unlike the other groups, they have an abundance of bristles on the sides of the body.

C.) Describe the mode of locomotion observed in a representative of each group.

In general, the musculature present in the body wall is responsible for the animal's movement.

• Oligochaetes move through the alternating contraction of circular and longitudinal muscles. On its body, the bristles prevent the body from slipping through the sediment.
• The group of polychaetes uses the bristles inserted in the parapods as feet, but also, like the group of oligochaetes, they use muscle contractions.
• Hirudines, on the other hand, do not have bristles and use the suction cups inserted at each end to perform a movement called “mede-palmos”.

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