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Transcript of To Amphibious
Caecilian cirulatory/gas exchange system
Salamanders and Newts
Frog and Toad Digestive System
Frogs and Toads
To Amphibians and Beyond!
Caecilians are limbless, burrowing amphibians. All are blind and worm-like. 160 species are known.
Frogs and Toads Nervous System
Salamander/Newt Nervous System
Salamander/Newt Circulatory System/ Gas Exchange
Caecilians Nervous System
Frog and Toad Excretory System
Caecilians Excretory System
Frog and Toad Reprodcutive System
Salamander/Newt Reproductive System
Male Salamders have testis, mullerian duct, wolffian duct, and a cloaca.
Female salamanders have ovaries, oviducts, wolffian duct, and a cloaca.
The “Sperm packet” is deposited by male in water and taken up by female for internal fertilization.
Salamanders can either lay eggs or the eggs can development within the female for anywhere from 3 weeks to 2 years.
The male salamander seeks out female and wafts glandular secretions toward her by fanning of his tail.
Caecilians Reproductive System
Frog/Toad Body Plan
Salamander/Newt Body Plan
Caecilian Body Plan
Frog/Toad Ecological Niche
Salamander/Newt Ecological Niche
Frog/Toad Evolutionary History
Salamander/Newt Evolutionary history
Caecilians Evolutionary history
Caecilians Ecological Niche
Caecilians Digestve System
- the esophagus and the mouth are lined with cilia that sweep small food particles into the stomach
- the intestine opens into a cloaca, a chamber into which the digestive system empties, a ventral outfolding of the cloaca gives rise to the urinary bladder.
-teeth are located on the jaws and on the roof of the mouth.
- some species have lungs but some
use use their skin or mouth to
- have a 3-chambered heart a right
atrium, a left atrium and a single
- have long kidneys extending most of the length of their body cavity. They have well developed
capillary nets in the interior of the kidney.
-are found in
or anywhere that is close to any body of water except saltwater.
- the first fossil a vertebra dated back Paleocene area wasn't discovered until 1972. The earliest fossil known dates by to the Jurassic period, its primitive genus is Eocaecilia.