Vertebrates. Animal Kingdom. Wildlife. Fauna. Zoology. Fauna. Nature of Aragon Spain.

Vertebrates. Animal Kingdom. Wildlife. Fauna. Zoology.

Nature of Aragon > Fauna

Vertebrate animals are the most evolved in the Animal Kingdom.

They have an internal skeleton with a backbone, or dorsal cord, the main characteristic of these animals, which serves as a support for the body and protects the nervous system.

This skeleton can be bony or cartilaginous.

General Characters

They are classified in the Type of the Cordados and there are more than 40,000 species in the world.
They are adapted to all environments and environments and move both on land, in the sea, and in the air, with great differences between them.

The nervous system

The nervous system is very evolved.
 It consists of: brain, which includes the brain, cerebellum and spinal bulb;
 marrow from which the spinal nerves come out in pairs, with two branches, one sensitive and the other motor.
 Vertebrates possess the cerebrospinal and sympathetic nervous system.

Blood circulation

The circulation is closed. and blood and lymph circulates through venous and arterial vessels.
 It can be simple (in fish) or double, and complete or incomplete depending on whether or not arterial and venous blood is mixed.
The blood is red because of the hemoglobin in red blood cells or red blood cells.

Animals that do not have constant temperature regulating mechanisms are called cold blood. Therefore, these animals have a variable temperature and generally adopt that of the environment.

Warm-blooded animals are those that have mechanisms that regulate their body temperature and keep it constant, regardless of the environment around them.

Reproduction of vertebrates

Reproduction in vertebrates is sexual with separate sexes, except for some fish.
 The male has sperm-producing testicles and the female has ovum-producing ovaries. The fertilization can be external or internal in which case the male has a copulatory organ.
 Vertebrates can be oviparous (reproduction through eggs) such as fish, amphibians, some reptiles and birds, ovoviviparous, like some reptiles, or viviparous, when the young are born alive as in mammals.

There is an embryonic resemblance between development in fish, amphibians, reptiles, birds and mammals.


Breathing can be gill in the aquatic or pulmonary in the terrestrial.
 In amphibians it is also done through the skin.

The Skin

The skin, or tegument, is formed by two layers: external epidermis and internal dermis, which can contain glands, such as sweat, odorous, poisonous or pigmentary sebaceous.
 It can be protected by hairs, feathers scales, nail plates, hooves, horns, thorns, etc.


CYCLOSTOMES COLD BLOOD Gills Simple and complete
FISHES COLD BLOOD Gills Simple and complete
Amphibians COLD BLOOD Gills and Lungs Double and incomplete
REPTILES COLD BLOOD Lungs Double and incomplete
BIRDS HOT BLOOD Lungs Double and incomplete
MAMMALS HOT BLOOD Lungs Double and complete


Over 500 million years ago, animals with dorsal cord appeared, the primitive chordates that developed an internal skeleton to become in vertebrate primitives.

From the first placoderm fish, vertebrates evolved in various branches that have given rise to current vertebrates.

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.

Vertebrates. Animal Kingdom. Wildlife. Fauna. Zoology. organism, inheritance, reproduction, physiology, metazoans, celomados, chordates, ecology, zoogeography

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