Hanna Hetrick. Agnatha The oldest class of vertebrates Includes lampreys and hagfish.
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Transcript of Hanna Hetrick. Agnatha The oldest class of vertebrates Includes lampreys and hagfish.
7 Deadly Classes of Vertebrates
Hanna Hetrick
Agnatha
The oldest class of vertebrates
Includes lampreys and hagfish
Chondrichthyes
Otherwise known as the cartilaginous fish
Have skeleton made of cartilage
Includes sharks, rays, and chimeras
Osteichthyes
Otherwise known as the “Bony Fish”
Skeletons are made of bone
Most diverse group
Includes Ray-Finned Fish
Amphibia
First vertebrates to live in land and water
Reproduce in water or on moist land
Include salamanders, frogs, caecilians
Reptilia
Able to retain moisture, meaning they can live exclusively on land
Produce eggs that do not develop in water
Include snakes, lizards, crocodiles, alligators, and turtles.
Aves
Otherwise known as birds
Distinguished by the presence of feathers
Mammalia
Distinguished by animals that have hair, mammary glands, and three middle ear bones
Have live births
Timeline of Evolution
550 million years ago: Agnatha
500 million years ago: Chondrichthyes
490 million years ago: Osteichthyes
360 million years ago: Amphibia
300 million years ago: Reptilia
200 million years ago: Mammalia
150 million years ago: Aves
Chordata
The three classes of the Chordata Phylum
Basics
Chordata phylum is based on the animal at some point in their lifetime having: Notochord which is a flexible skeletal support
rod embedded in the animal’s back Hollow nerve cord which runs along the
animal’s back Pharyngeal slits through the body wall in the
pharynx. Allows water to pass through slits without going through digestive system
Tail extends beyond anal opening
Vertebrates
Larger, active animals that have a well developed brain encased in a hard skull. Like a camel
Tunicates
Otherwise known as urochordates
Includes both sessile and free-swimming such as sea squirts
Lancelets
Otherwise known as the cephalochordates
Small eel-like animals that are commonly found in the shallow tropical oceans