Asquelmintos Round worms Invertebrates Animal kingdom. Wildlife. Fauna. Zoology. Fauna. Nature of Aragon Spain.

Asquelmintos Round worms Invertebrates Animal kingdom. Wildlife. Fauna. Zoology.

Nature of Aragon > Fauna

The asquelmintos

They form a very diverse group of worms that have a common characteristic of each other:

Everyone has a single cavity where the organs of his body are located, without segments or rings, although some outwardly appear to be ringed.

Asquelmints are divided into the following classes: Rotifers, Gasterotricos, Quinorrincos, Priapuloideos, Nematomorfos and Nematodes.

They are very little known, except the nematodes.


They are microscopic asquelmintos worms that live in ponds and streams of water. They are very abundant.
They have a crown of cilia that serves as a rotating organ and a kind of nail to fix.
They have no respiratory or circulatory system.
They have separate sexes.

Many are invertebrate parasites.


They are microscopic aquatic worms of which there are about 200 species, provided with vibrating cilia, which serve as an organ of locomotion, in their ventral face.

They are similar to rotifers and live in the muddy bottoms of the ponds next to the infusoria.

Cinorrincos or Quinorrincos

They are marine worms that measure 1 mm maximum and live on the algae or in the mud. His body is covered with plates with spines, and they appear segmented. The head and the pharynx is retractable, and catches the food by sucking it. There are about 100 species.
Its development is done through successive changes


They are marine worms of about 8 or 10 cm in length, with a soft and cylindrical body.
They have the anterior part of the body in the form of a proboscide or retractable tube with rows of hooks and the mouth at its end
The lower limb is branched with a respiratory plume. Dig with the trunk in the sand to feed on organic materials

Nematomorphs or fat one

They are cylindrical and filiform worms that, in their larval state, are parasites of arthropods, and of free life in their adult state. They live in fresh and marine waters.
They have separate sexes and often entangled male and female, similar to a bundle of threads. They are usually vulgarly called "horse hairs."

Acantocephalos or equinorrincos

They are parasitic worms of the digestive system in vertebrates. Their larvae parasitize in crustaceans or insects.
They have no digestive tract, feeding through the skin.
They have a retractable tube armed with hooks at their head end.
They are viviparous and the sexes are separated, being the females of greater size, some of which can measure 60 cm in length.
Man can be parasitized by these invertebrates but rarely.

The Nematodes

They are elongated cylindrical worms, very narrow at the ends.
 The sexes are separated and there is a variation or dimorphism between them, the female being almost always older.
 They have few sensory organs, but some species of aquatic life have a pair of simple eyes.
 There is no other type in the Animal Kingdom that has as many individuals as nematodes. They live in every imaginable condition.

They can withstand drying, large temperature variations and a wide variety of chemical agents. They are parasites of animal and human plants and most are dangerous.

The best known are: the filaria, the intestinal worm, the ascaris, the hookworm, the trichina, etc.

Most produce extremely dangerous anemias and diseases, among which trichinosis stands out.

The trichina

It is a very small nematode (one millimeter in length) that can cause trichinosis, a serious disease almost always fatal to man, which can be contracted by eating infected and undercooked pork.

The pig acquires it when ingesting meat from infected rats, and its larvae are encyst between the muscle fibers.
The trichina penetrates into all corners of the body through the blood and lymph vessels causing death.
The infected pig is the transmitter of the parasite to man.

Other information about fauna in Aragón:

A small list of species in Aragon would be the following:

Vertebrates Invertebrates








   images about the fauna in Aragon.
   photographs on invertebrates.
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Asquelmintos Round worms Invertebrates Animal kingdom. Wildlife. Fauna. Zoology. organism, reproduction, physiology, metazoa, celomados, worms, ecology, zoogeography, water, humidity

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