The Coelenterates are very primitive organisms and of a great simplicity.
There are more than 4,500 species of very varied forms, they are marine animals and therefore without presence in Aragon.
They have radial symmetry and the body is formed by two layers of cells, one external or ectoderm, which is attached to another inner layer or endoderm, through an intermediate layer jelly-like called mesoglea.
These animals, gelatinous in appearance, are mainly composed of water (90%).
A characteristic of the censorereos is the presence of stinging cells called nematocysts. Celentéreos have two different forms: one fixed, the polyp, and the other mobile, the jellyfish.
The stinging cells of the censorereos, called nematocysts, have a sensitive cilia that, with the slightest rubbing, causes a filament to shoot with great force with numerous thorns with which they inoculate poison, capable of paralyzing small animals.
Types of censorereos
The celentéreos are divided into the following classes:
- HYDROZOES or hydras
Hydrozoans comprise hydras or hydroponics, hydromedusas and siphonophores.
Hydras look like a sac with one end with which they adhere to the ground or plants, and with their mouths at the other end, surrounded by fine tentacles. Your body is completely upholstery of stinging cells or nematocysts.
Reproduction can be asexual, through buds (budding), and sexual, developing testicles and ovaries and fertilizing between different individuals.
Hydras have great regeneration power, each fragment becomes a complete individual. ESCIFOZOOS or jellyfish
The jellyfish or sphincter are celentéreos that almost always have a flared or spherical cap shape. They have gelatinous consistency, almost transparent.
On the edge of the umbrela they have tentacles and have a circular musculature that allows them to contract quickly for their propulsion.
They reproduce sexually and asexually with stages of fixed polyps.
Hydromedusa Obelia has a colonial hydroid shape that produces free and floating individuals in the form of jellyfish.
These have sexual organs that produce gametes from which a new hydroid colony is born.
The siphonophores are not a single animal, but a numerous colony of them, which each have a special function, and are provided with a swim bladder, sometimes beautiful colors.Jellyfish spread across all the seas of the world, from the surface to the depths.
The umbrellas they have sometimes have a great color.
The tentacles of some are highly stinging and dangerous for bathers.- ANTOZOOS, CORALARIOS or actinias
The anthozoans are polyphentic-shaped celentéreos with stinging tentacles surrounding their mouth opening.
The gastrovascular cavity is divided into septa or septa.
Corals and madréporas secrete a limestone skeleton called polyper that is growing continuously, giving rise to huge colonies that form barriers near the coasts, constituting atolls, banks and coral reefs.
Actinias and anemones live in isolation and sometimes in symbiosis, attached to other marine animals, such as crustaceans, molluscs, etc., and do not have a skeleton. TENOFOROS
Ctenophores: They are censorereos of free life.
They don't have stinging cells.
They are transparent and have comb-shaped lamellae that allow them to move when vibrating.
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. | |
Also Aragon enjoys a diverse and varied Nature where passing by plants, animals, Geology, or landscapes we can arrive at a fantastic bestiary that lives in its monuments.
The information will not be complete without a stroll by its three provinces, with shutdown in some of its spectacular landscapes like Ordesa, the Moncayo, Monegros or by opposition the Ebro.
Also you can dedicarte to the intangible ones: from the legend compilation that also does to universal Aragon.