'Order urodela' diaporamas de présentation

Vertebrates

Vertebrates. The Origin of Tetrapods. The first vertebrates on land were amphibians in the Devonian (400 mya ) May have arose from the rhipidistian (features). Arose in coastal or brackish marine environment. Origin of Tetrapods. Origin of Tetrapods. Tetrapods.

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Chapter 34

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Amphibians

Amphibians. Evolution of Amphibians. "Amphibian" comes from the Greek meaning "both life". Amphibians can live on water and on land. Scientist infer that amphibians evolved from lobe-finned fishes called crossopterygians. Crossopterygian.

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Amphibians

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Amphibians!!!

Amphibians!!!. Taxonomy of Amphibians Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Amphibia Order Urodela (salamanders & newts) Order Anura (frogs & toads) Order Apoda (caecilians). Order Urodela (formerly Caudata) salamanders and newts.

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Fig. 34-3

Dorsal, hollow nerve cord. Muscle segments. Fig. 34-3. Notochord. Mouth. Anus. Pharyngeal slits or clefts. Muscular, post-anal tail. Cirri. 2 cm. Mouth. Fig. 34-4. Pharyngeal slits. Atrium. Notochord. Digestive tract. Atriopore. Dorsal, hollow nerve cord. Segmental muscles.

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Fig. 34-3

Dorsal, hollow nerve cord. Muscle segments. Fig. 34-3. Notochord. Mouth. Anus. Pharyngeal slits or clefts. Muscular, post-anal tail. Cirri. 2 cm. Mouth. Fig. 34-4. Pharyngeal slits. Atrium. Notochord. Digestive tract. Atriopore. Dorsal, hollow nerve cord. Segmental muscles.

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