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VERTEBRATES AND HUMAN EVOLUTION, conjunto-animal-reptil_1308-26287,…
VERTEBRATES AND HUMAN EVOLUTION
what is it?
Vertebrates, the principal chordate group, are characterized by a vertebral column and a distinct
head.
who were the first vertebrates?
Fishes were the first vertebrates to make their appearance, and today they are still the largest
vertebrate class. They are the vertebrate group from which all other vertebrates evolved. :
how does human evolution starts?
We came from a family group called "primates" and we all evolutionated differently by our different ancestors environments they all lived in, this is why we are not exactly the same as monkeys or chimpanzees but we come from the same ancestors.
types of vertebrates
there are many types of vertebrates like: mammals, reptiles, amphibians and chordates.
Mammals
Mammals first appeared 220 million years ago, evolving to their present position of dominance in modern terrestrial ecosystems.
Mammals are the only
vertebrates that possess hair and milk glands.
Amphibians
Amphibians are a class of anamniotic, tetrapod, ectothermic vertebrate animals, with gill respiration during the larval and pulmonary phase upon reaching the adult stage, unlike the rest of vertebrates, they are distinguished by undergoing a transformation during their development.
CHARACTERISTICS: Have legs, Partially divided heart, Pulmonary veins, Lungs and Cutaneous respiration
Chordates
Chordates are characterized by a hollow dorsal nerve cord, a notochord, pharyngeal gill slits, and a postanal tail at some point in their development.
The flexible notochord anchors internal
muscles and allows rapid, versatile movement.
reptiles
Reptiles were the first vertebrates to completely master the challenge of living on dry land. Many major reptile groups that dominated life on land for 250 million years are now extinct.
The four living orders of reptiles include the turtles, lizards and
snakes, tuataras, and crocodiles.
ChHARACTERISTICS: Amniotic egg, Dry skin, Thoracic breathing.
Amniotic egg
Most reptiles lay watertight eggs that contain a food source (the yolk) and a series of four
membraness—the yolk sac, the amnion, the allantois, and the chorion. Each membrane plays a role in making the
egg an independent life-support system.The outermost membrane of the egg is the chorion, which lies just beneath
the porous shell. It allows respiratory gases to pass through, but retains water within the egg.
Birds
birds, formally called passerines but which we popularly call as birds, and which comprise more than half of the bird species that flap around the world. The diversification of the birds is impressive, calculating an approximate of almost six thousand species.
CHARACTERISTICS: They are warm-blooded, have hind limbs, wings, which allow them, in almost most birds, to fly.
EXAMPLES:
Diurnal Birds of Prey (Accipitriformes) ...
Waterfowl Birds (Anseriformes) ...
Hummingbirds & Swifts (Apodiformes) ...
Kiwis & Extinct Birds (Apterygiformes) ...
Hornbills & Hoopoes (Coraciiformes)
Ricardo Madera Bojorquez
Jose Daniel Armenta Morales
