1 / 9

KEY CONCEPT Amphibians evolved from lobe-finned fish.

KEY CONCEPT Amphibians evolved from lobe-finned fish. Amphibians were the first animals with four limbs. Tetrapods are vertebrates that have four limbs. The fossilized remains of Tiktaalik roseae indicate it was a transitional species between fish and tetrapods.

london
Download Presentation

KEY CONCEPT Amphibians evolved from lobe-finned fish.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. KEY CONCEPT Amphibians evolved from lobe-finned fish.

  2. Amphibians were the first animals with four limbs. • Tetrapods are vertebrates that have four limbs. The fossilized remains of Tiktaalik roseae indicate it was a transitional species between fish and tetrapods.

  3. Vertebrates that lack four limbs evolved from limbed ancestors. • Amphibians are animals that can live both on land and in water.

  4. A number of adaptations allow amphibians to live on land. • large shoulder and hip bones • mobile, muscular tongue • middle ear • breathe through skin or with gills or lungs

  5. Amphibians return to the water to reproduce. • Amphibians use many strategies to keep their eggs wet. • lay eggs directly in water • lay eggs on moist ground • wrap eggs in leaves • brood eggs in pocketson the female’s back

  6. adult frog fertilized eggs young frog tadpoles • Tadpoles are aquatic larvae of frogs. • During metamorphosis, tadpoles develop into their adult form. • Not all amphibians undergo metamorphosis.

  7. Modern amphibians can be divided into three groups. • Salamanders have a long body, four walking limbs, and a tail. • There are over 300 species of salamanders.

  8. Frogs are the largest amphibian group and include toads. • There are over 3000 species of frogs. • Glands in the skin of frogs and toads contain poisons that help to protect them from predators.

  9. Caecilians are legless, burrowing, tropical amphibians. • There are 160 species of caecilians.

More Related