1 / 6

Amphibians

Amphibians. First Tetrapods on Land. Class: Amphibia. First truly tetrapod vertebrate Ectothermic All amphibians have bony skeletons Most have 4 limbs, except Caecilians (limbless) Many have webbed feet Typically the glandular skin is smooth, moist, and lacks scales

lundy
Download Presentation

Amphibians

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. Amphibians First Tetrapods on Land

  2. Class: Amphibia • First truly tetrapod vertebrate • Ectothermic • All amphibians have bony skeletons • Most have 4 limbs, except Caecilians (limbless) • Many have webbed feet • Typically the glandular skin is smooth, moist, and lacks scales • Metamorphose from juvenile water breathing to adult air breathing • Ecological indicators

  3. Order Anura (Salientia): Frogs and Toads • Order Caudata (Urodela): Salamanders, Newts, Waterdogs, Mudpuppies, Sirens, and Amphiuma • Order Gymnophiona (Apoda): Caecilians

  4. Class: Amphibia • Gas exchange occurs through lungs, gills, and/or the skin • Some salamanders have no lungs (secondarily lost) • Adults have double circulation • Both a pulmonary and a systemic circuit • Heart has three chambers • Two atria and one ventricle • Some mixing of oxygenated and deoxygenated blood occurs in ventricle

  5. Anamniotic egg http://epod.usra.edu/archive/images/egg_mass.jpg • Jellylike • unshelled; must develop in water • Small-sized • lack large membranes to nourish embryo and store waste Amphibian egg mass

  6. Amphibian development http://www.mybitoftheplanet.com/2002/ http://www.herpnet.net/Iowa-Herpetology/ Newt http://fwie.fw.vt.edu/VHS/ http://www.herpnet.net/Iowa-Herpetology/ Controlled by the hormone thyroxin

More Related