Metazoans. Invertebrates. Animal Kingdom. Fauna. Fauna. Nature of Aragon Spain.

Metazoans. Invertebrates. Animal Kingdom. Fauna.

Nature of Aragon > Fauna

This suborder includes all multicellular animals. The set of cells can be organized into more or less complex tissues. The life of all individuals originates from a single cell, which by successive divisions gives rise to the remaining ones that will form the organism, then differentiating into the various tissues and forming the corresponding organs.

It is difficult to establish the origin of the Metazoans. It is admitted that the first animal organisms evolved to form the Protozoa, separating these into several branches, mainly that of the Flagellates and the Poriferos. From the common line, forms with added cells emerged that ended up constituting multicellular organisms. However, they did not form tissues so they remained at the level of Mesozoans. The next step was the organization of these cells in real tissues, appearing the Coelenterates. These animals are called diblastic because their body is made up of two unique cell layers, an outer (ectoderm) and an inner (endoderm). With the appearance of a third intermediate cell layer (mesoderm), the rest of the Metazoa appear, which are called triblastics.

In the embryonic development of triblastics, a simple digestive tube is first formed with two openings: a mouth and an anus. Later, to give the adult individual, in some this disposition is maintained, while in others the mouth appears in a different place. In this way, two main lines of Metazoans are distinguished: the Prostostomes (where the embryonic mouth, the blastópore, is still preserved in the adult) and Deuterostomes (the blastopore closes and the adult mouth appears in a different place).

Protostomes comprise, among others, three large groups: Annelids, Mollusks and Arthropods, while Other important groups are included in the Deuterostomes: Echinoderms and Chordates .

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.
   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.

Fauna | Flora | Geology | Fungi | Water
Landscapes | Monegros | Moncayo | Ebro | Ordesa
Bestiary | Books | Buffon | Activities | Culturales | Zh2o | Photografies
Document | Nature in Aragon

The pasapues project is an extension of the Aragón project is like that, and tries to collect and relate all possible types of documentary information about Aragon: texts, books, articles, maps, illustrations, photographs, narrations, etc., and proceed to its publication and diffusion.

Metazoans. Invertebrates. Animal Kingdom. Fauna. Zoology, reproduction, physiology, metazoa, ecology, zoogeography, stone, earth, air

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