Presentation is loading. Please wait.

Presentation is loading. Please wait.

Chapter 19-Amphibians Amphibian- Double Life - Water and land.

Similar presentations

Presentation on theme: "Chapter 19-Amphibians Amphibian- Double Life - Water and land."— Presentation transcript:

1 Chapter 19-Amphibians Amphibian- Double Life - Water and land

2 Amphibian Characteristics 1 st true tetrapod vertebrates Bony skeletons with four limbs –Exceptions: Caecilians (limbless) and Sirens (forelimbs only) Many w/webbed feet Thin moist skin; no scales lungs Breathe w/ lungs (Internal, bag-like organ that exchanges oxygen and carbon dioxide with the air and blood) –Exception: Lungless salamanders –Larvae- gills Cutaneous respiration Cutaneous respiration- Skin breathing –Supplement oxygen intake w/ moist skin –Limited by body size

3 Double-Loop Circulation

4 Amphibian Characteristics Partially divided heart: septum –Atrium separated into left and right sides by septum, ventricle is not –Right side sends oxygen-poor blood to lungs –Left side send oxygen-rich blood to organs Double-loop circulation Double-loop circulation: –Two large veins (pulmonary veins) return oxygen-rich blood from lungs to heart –Blood pumped to tissues at higher pressure than fish –Systemic circulation- Blood flow to the body

5 Class Amphibia Order Anura- Frogs and toads Order Urodela (Caudata) – Salamanders, sirens, newts, waterdogs, mudpuppies Order Gymnophiona (Apoda)- Caecilians

6 Class Amphibia

7 Order Anura- Frogs and Toads Anura- without a tail Adult carnivores Skin with mucus and some with poison glands Sticky tongue, hinged at the front, attaches to prey –Vomerine teeth- two small nobs help hold in prey Hind legs adapted for jumping Frogs are smooth w/ longer legs Toads are rough w/shorter legs Most frogs depend on water for life cycle –Females lay eggs in water –Males fertilize them tadpoles –Larvae are tadpoles Gills Feed on algae Incomplete metamorphosis Develop into adult frogs Rate depends on species and food

8 Leopard Frog and Fowlers Toad

9 Goliath Frog- Conraua goliath - Largest frog in world - Found in Cameroon

10 Poison-Dart Frogs- Family Dendrobatidae


12 Frog Characteristics Tympanic membrane Tympanic membrane- thin membrane that detects vibration (eardrum) –Eustachian tubes- equalize pressure on eardrums Skin has mucus glands –Mucus is poisonous or foul tasting in most Nictitating membrane- transparent eyelid Two teeth in roof of mouth Swallow food whole Cloaca Cloaca- Chamber opening to outside of body –Serves as exit for wastes and gametes -Oviduct- carries eggs to cloaca - Vocal Sacs- Expandable membranes that collect air after passing over vocal cords for louder croaking

13 Amplexus

14 Order Urodela (Caudata- with a tail) 369 species of salamanders, newts, sirens, amphiuma, waterdogs, and mudpuppies Elongated bodies w/long tails Smooth, moist skin; Require moisture External fertilization in water or moist area –Internal fertilization- females insert sperm packet into cloaca –Larvae gilled, carnivorous, smaller version of adult –Some retain gills as adults (neoteny- never lose larval characteristics) Salamanders

15 Axolotl Salamander that never loses its gills Neoteny Found in N. america

16 Other Urodela (Caudata) Newt Amphiuma Water dog Mud puppy

17 Order Caudata- Sirens Aquatic salamanders Have only front extremities Maintain gills throughout life Some can vocalize Most likely external fertilization

18 Order Apoda- Caecilians Apoda- without legs Tropical, burrowing amphibians Small, bony scales embedded in skin Legless Carnivorous Male deposits sperm directly into female Females may have live young or lay eggs

Download ppt "Chapter 19-Amphibians Amphibian- Double Life - Water and land."

Similar presentations

Ads by Google