Difference between small-bristled and polychaete worms.

Sometimes, at the anterior end of the worm, the bristles form a corolla, which performs the respiratory function. Each segment contains an isolated coelomic sac, and the organs of reproduction and excretion are duplicated.

Polychaetes possess eyes and organs of balance. Most worms are dioecious. After external fertilization, the female lays eggs. Trichophore larvae emerge from them. After a while, they transform into an individual similar to their parents. Most polychaetes are carnivores, a smaller number of species are engaged in eating the remains of flesh or dead plants that have fallen to the bottom.

Conclusions TheDifference.ru

  1. There are fewer types of small-bristled worms than polychaete worms. The first are only 3 thousand species, the second - about 10 thousand.
  2. The maximum size of polychaetes exceeds the maximum size of oligochaetes, reaching 3 meters.
  3. Animals have different habitats. Small bristle worms live mainly in the ground, most polychaete worms prefer warm and salty water bodies.
  4. Oligochaetes perceive oxygen through the entire surface of the skin; polychaetes breathe with the help of pseudo-gill-setae.
  5. Small bristles are hermaphrodites, polychaetes are dioecious animals.
  6. Oligochaetes that emerged from the egg are similar to their parents. Polychaetes go through the larval stage.
  7. Small bristles devour dead foliage and corpses, most polychaetae are active predators.
  8. Small bristles are one of the main producers of humus, therefore they are subject to protection and respect for them!
.