PLACANTARIES: What are, characteristics, classification and examples

Start by clarifying What are placental mammalsalso simply called placental animals. Thus, placental animals constitute a Taxonomic infraclase (Placentalia) Within the wide class that make up Mammals. The females of these species of placental animals They have an internal morphological structure in their bellies, called placentawhich guarantees the protection and feeding of the embryos during their gestation period.

This amazing characteristic is contrary to the external marsupio that characterizes the other subclass (marsupial) included in the class of mammals. If you want to know them better, we encourage you to take a look at this other post about what marsupial animals and examples are.

Let’s see in the next sections more characteristics related to placental animals, as well as their classification and many examples to know them more closely.

The placental animals are the Viviparous mammals par excellence, that is, the most numerous and developed group within mammals. Among the main characteristics of placental mammals stand out:

• The embryo grows inside the maternal uterus For a long period of time, being The placenta The person in charge of guaranteeing food from the mother, as well as protection and the ideal environment for its correct development.
• The females of this types of animals have the zeal or estral cyclewhich allows the body to be prepared for intercourse, fertilization and gestation of the offspring.
• They also have mammary glands that allow them to produce the milk that the young need to take since they are born to develop and grow to change to the definitive food.
• These animals have different Types of foodthere are carnivores, herbivores and omnivores.
• Throughout their life, they have Two types of teeth different, the first during the children’s phase and the next in the adult phase.
• Placental animals do not have sewer, but a excretion system connected to the digestive and isolated from reproductive.
• The placental animals They have a fureither dense and thick or with less quantity and fine, and they can always have it or in some stages of their life, as well as throughout the body or only in some parts.
• They also have sweat glands Distributed by different areas of the body that allow them to sweat and thus facilitate the regulation of temperature and the elimination of toxins of the organism.
• The brain of placental animals has large cerebral hemispheresas well as with a callosum that connects both hemispheres, thus guaranteeing a very advanced development of cognitive functions.
• They have the Synapsid skullwhich means that this has a Lower temporary pit which is an opening located behind ocular orbits. This skull pit allows this to be lighter and that in this area are inserted jaw muscles lower facilitating your movement to feed, emit sounds, bite, etc.
• As for other common morphological characteristics, it is worth noting how the most primitive placentaries agreed to be small, as well as having very short legs with five fingers and a tubular skull. However, at present, due to the changes that have been experiencing the different types of placental animals throughout their evolutionary lines, these common characters are appreciated with greater difficulty.

We also recommend you know more about these animals with this other post of ecology viviparous animals: what are, characteristics and examples.

At present, the classification of placental animals Follow a phylogenetic approach based on biomolecular and genetic results of the species, which allow each and every one of the placental animals that exist (or exist) on the planet following the following classification:

• Cingulados
• Pilosos
• Tubulidenties
• Macroscélidos
• Hiracoids
• Proboscides
• Sirenians
• Eulipotiflanos
• Quiroptera
• Foliated
• Carnivores
• Perisodactile
• Cetaceans
• Artiodactile
• Lagomorphs
• Rodents
• Scandal
• Primates

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