By Mandi Goston

Agnatha Method of fertilization External. Habitat Sea water or freshwater, Dwell around muddy banks and in colder climates. Found in extreme depths. Classifying Characteristics Jawless fish from the chordata phylum. Skeleton of the Agnatha is made of cartilage rather than bone, allowing more flexibility. Unique Extras For breathing the Agnatha use a collection of seven or more gill pouches that are held close to the surface by brachial arches. Include hagfish and lamprey. Are cold blooded and have 2 heart chambers.

Chondricthyes Examples Sharks (cold blooded) # Of Heart Chambers Two Method of Fertilization Internal Habitat Live in Coastal water on the bottom or out at sea in open water. Classifying Characteristics Skeleton is cartilaginous. Their skin is covered with dermal teeth which is also called placoid scales or dermal denticles. Unique Extras Breath thorough 5-7 gills, depending on species

Osteichthyes Examples Ray-finned fish and lobe finned fish (cold blooded) # Of Heart Chambers Four Method of Fertilization Internal Habitat Live in water, from freezing Arctic waters to hot desert springs. Classifying Characteristics Bony fish typically have swim bladders, which helps the body create a neutral balance between sinking and floating. Unique Extras Skeleton is made out of cartilage and bone.

Amphibia Examples Frogs, toads, salamanders, newts ( cold blooded) # Of Heart Chambers Three Method of Fertilization Internal Habitat Found around freshwater, live in tropical conditions. Also can live on land. Classifying Characteristics Typically have four limbs. Lay eggs in water. Unique extras Their name means “double life” in Greek. Amphibians spend at least part of their lives in water; some are entirely aquatic.

Reptilia Examples Snakes, Lizards, and Turtles (cold blooded) # Of Heart Chambers Three to Four Method of fertilization Internal Habitat Can live in desert areas and warm climates such as jungle and tropical areas. Classifying Characteristics They are ectodermic vertebrates, skin has scales, but no hair of feathers. Have claws on toes except for those who don’t have legs. They lay eggs. Unique Extras Since reptiles do not produce their own body heat, they modify their activity and behavior to best adapt to changing environmental temperatures.

Aves Examples Birds (warm blooded) # Of Heart Chambers Four Method of fertilization Internal Habitat Can live by water, on land, or in high places. Classifying Characteristics Characterized by feathers. A beck with no teeth, the laying of hard-shelled eggs, an a light weight, but strong, skeleton. Unique Extras The earliest bird known is the late Jurassic Archaeopteryx.

Mammalia Examples Humans, Primates, bats, and etc. (warm blooded) # Of Heart Chambers Four Method of fertilization Internal Habitat Hair provides insulation from extreme cold, enabling mammals to inhabit some of the harshest habitats on earth. Classifying Characteristics The three middle ear bones, the malleus, incus, and stapes function in the transmission of vibration from the tympanic membrane (eardrum) to the inner ear. Unique Extras Three middle ear bones, hair, and production of mild by modified sweat glands are called mammary glands.