Introducing 

Prezi AI.

Your new presentation assistant.

Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.

Loading content…
Loading…
Transcript

The Timeline of vertebrates evolution

Seth Okai

17/05/2020

Sub phylum vertebrata and class agnatha

The Sub phylum veterabata includes all animals with a backbone gills and a central nervous system.

The class agnatha have no fins, no scales, and no jaw. Skeleton of cartilage,They are not true vertebrae they are supported by a notochord

1.The first vertebrates, >500 million years ago (Ma)

Lamprey

Giraffe

Evolution of classes

Chondrichthyes and Osteichthyes

The classes chrondricthyes and ostheichthyes are both jawed vetebrates unlike class agnatha which are jawless example of class chrondricthyes are sharks and an example of classs osteichthyes is tuna

2.The first jawed vertebrates, ~400 Ma

Lungs and weight bearing limbs in Subclass Sarcopterygii

Sarcopterygii had weight bearing limbs which evolved into fully jointed limbs as we can see in humans they also had lungs to help the transition from water to land.

Transitional fish and amphibians

3.The first terrestrial vertebrates, ~370 Ma

The tiktaalik was a fish that marked the transition between sea creatures and amphibians. has traits common to the first four-footed animals.Amphbians have the following :Endoskeleton made mostly of bone,skin is smooth with many capillaries and pigments, no scales.

usually two pairs of limbs with webbed feet.

As many as four organs of respiration.

a three chambered heart and they are Oviparious with external fertilization.

Pictures

Amniotic egg and the age of reptiles

Reptile eggs became amniotic, so they can be laid on land instead of in water. This allowed them to move around more.

During the Mesozoic Era, life diversified rapidly and giant reptiles, dinosaurs and other enormous beasts roamed the Earth.

4. The first reptiles, ~310 Ma

Pictures

Hominids

The two main characteristics of hominids are bipedalism and big brains.

5.The evolution of hominids, ~4 Ma,

Australopithecus

Australopithecus is a genus of hominins that existed in Africa from around 4.2 to 1.9 million years ago

The genus Homo has large cranial capacity, limb structure adapted to a habitual erect posture and a bipedal gait, well-developed and fully opposable thumbs, hands capable of power and precision

Homo

Homo habilis

Homo habilis is an archaic species of Stone Age human which lived between roughly 2.3 and 1.5 million years ago

Homo erectus

The oldest known early humans to have possessed modern human-like body Their first apperances were from about 1.9mya

Homo neanderthalis

Neanderthals are an extinct species or subspecies of archaic humans who lived in Eurasia until about 40,000 years ago.

Homo Sapiens

Homo sapiens is the only extant human species. The name is Latin for wise man

Learn more about creating dynamic, engaging presentations with Prezi