Mammalian Species
Mammalia, (comprised of five subgroups) are a class of mammals composed of over 60 types of mammals. There is only one species in this class: the rabbit. Other rodents and snakes are placed in another category called Cetacea. Other placental mammals are not part of this group. Primates, placental birds, and non-mammals like to be placed in the class Mammalia.
The word ‘mammalia’ refers to both a living animal and a dead one. In fact, mammals comprises of extinct animals and dinosaurs but is also known to refer to living creatures such as alligators, sharks, salamanders, and some lizards. Most mammals belong to the class Mammalia and are classified into four subclasses, i.e. Neornithes, Saurischia, Eutheria, and Multituberculata.
Neornithes includes all mammals with bony faces and small teeth. These include all carnivores. Saurischia includes all warm-blooded vertebrates with bony faces, small teeth, and hairless lips. Multituberculata includes all placental mammals with bony jaws, webbed hands and limbs and hairy ears and fur. Fur is used for warmth and is dense on the body and head.
Among these, there are two representatives of Ornithischia that are well known: the platypus and the mollusk. The platypus belongs to the class Aves, and is represented by a long, spiraled beak, long incisors, and powerful claws. It also possesses the unique ability to lay eggs, which can be incubated by other mammals. The eggs have alkaline pH and are well suited for fertilization with sperm from an adult male.
Another well-known class of mammals is the multituberculate. This includes all hoist, alpines, and a few grasshoppers. These animals are arboreal, which means that they spend most of their time living in trees. They are classified as both sub-species of Eutheria as well as part of the Class Mammalia.
The third sub-class of Mammalia is the Class Mammalia, of which there are four representatives. These include the African Elephant, you, and the Bear. The most common animal in this class is the blue whale. It is a baleen whale due to its complete internal structure. The other members of the class Mammalia are represented by the shrews and the chinchilla. Sizes of their respective bodies vary greatly.
The last sub-class of Mammalia is the Class Mammalia, of which there are two representatives, the Minke Whale and the Steller Sea Bee. Both of these mammals belong to the Sub-classes Cetacea and Megatheria. The Cetacea includes the North Pacific Dolphin and the Leatherback Sea Cow. The Megatheria includes the Fur-Crowned Bear, the Galapagos Penguin, and the Wilson’s Owl. In fact there are only three representatives in the class Mammalia of these three animals. The other class of mammals are represented by a variety of unicellular organisms such as the flatworms and the mollusks.
The last sub-class of Mammalia is the Class Mammalia, of which there are only three representatives, the Eutherian mammals including theurochid and the placental mammals. The Eutherian mammals include the platypus and the acorn. The placental mammals include the human and the goose. The last sub-class of Mammalia is represented by the class Ornithischia, of which the most common terrestrial animals are the dinosaurs, the rodents and the birds.
All the Earth’s mammals belong to the class Cervical mammals and this includes all the placental mammals including humans. The most notable exception to this rule is the case of the human. There is one representative in this class, the human, who is covered with fur and possesses a bony growth, the so-called cephalogenary tubule. This is enclosed by a foamy fluid sac. The exception to this is that the hair of the human contains a keratin protein.
Apart from these two major classes of mammals, there exist two other classes of mammals. The first one consists of reptiles and amphibians and the other one is composed of unicellular and plant-eating mammals. Among the latter the arboreal placental mammals belong to the class Orthoptera and they have stingers and the eel and elk are representatives of the arboreal kind. Among these animals there are two sub-types; the semi-aquatic and the terrestrial types. Among the semi-aquatic species there are three representatives; the hoist, the pekoe, and the office cat.
Mammalia includes a wide variety of animals and among them the dogs are the most common mammals. It is estimated that the number of dogs today is close to fifty million and this constitutes a significant percentage of the entire mammal population which is spread over a large area. On the other hand, it is a very controversial subject as regards to how many different species there actually are. For example, there is a debate as to whether dogs are truly man’s best friend or not. On the other hand, some specialists consider the wolf to be a species of mammals along with the porcupine, the badger, the mine, and the brown bear. All these different species are considered to be distinct species and some are even hybrids.
In order to classify the different species of the Mammalia, we have to use several specific criteria. Firstly, the animals need to belong to a warm and wet environment which might be both marine and land. Secondly, they should feed on animal matter such as meat, fish, roots, nuts, and seeds and finally have sufficient space so they can move freely about. Finally, the temperature of the environment needs to be intermediate between night and day as well as hot and cold. The classification of Mammalia as well as classification of ecosystems are based on these criteria.
