Oligochaetes or worms are annelid worms, or ringed, with a cylindrical, soft body, elongated with numerous rings.
They are provided with ketas or silks (hence their name) that arise one by one of the muscles in a longitudinal direction.
They do not have parapods or "feet".
The head is reduced, without visual organs, and at its end is the mouth.
They have skin respiration.
There are almost 3,000 species, terrestrial and freshwater.
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The worms are hermaphrodites but two animals fertilize each other, surrounding themselves with a mucous capsule and releasing both eggs and sperm.
The already formed larvae hatch from the eggs and do not metamorphose.
Earthworm
Earthworms feed on organic particles contained in the earth that they swallow and then expel into little piles of excrement.
They are very beneficial for agriculture, since they aerate the earth through the galleries that they excavate in humid soils.
They have a great power of regeneration.
There are species of 1 mm in length to others of more than 3 meters such as the Australian giant earthworm.
Tubifex (freshwater worm)
Other information about fauna in Aragón:
A small list of species in Aragon would be the following:
| Vertebrates | Invertebrates |
|---|---|
MammalsBirdsReptilesAmphibiansFishes |
MetazoansProtozoa |
|
images about the fauna in Aragon. photographs on invertebrates. beneficial animals for agriculture. | |
Auch Aragon genießt eine vielfältige und abwechslungsreiche Natur, in der Pflanzen vorbeigehen, Tiere, Geologie oder Landschaften erreichen wir ein fantastisches Bestiarium, das in seinen Denkmälern lebt.
Die Informationen werden ohne einen Spaziergang durch die drei Provinzen nicht vollständig sein, mit Abschaltungen in einigen seiner spektakulären Landschaften wie Ordesa, der Moncayo, Monegros oder durch Widerspruch den Ebro.
Sie können sich auch den immateriellen widmen: von der Legendenzusammenstellung das gilt auch für das universelle Aragon.