CHORDATES CHAPTER 30.

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Presentation transcript:

CHORDATES CHAPTER 30

Learning Target 30.1 Identify the characteristics that all chordates share Explain what vertebrates are. Describe the two groups of non-vertebrate chordates

The Chordates Members of the phylum Chordata are called chordates All chordates share four characteristics: a dorsal hollow nerve cord a notochord a pharyngeal pouches a tail that extends beyond the anus

More Chordates are Vertebrates More than 99% of all chrodates are placed in the subphylum Vertebrata The backbone replaces the notochord in most developing vertebrates

Nonvertebrate Chordate The two groups of nonvertebrate chordates are tunicates and lancelets. Tunicates: the larval form has all of the chordate characteristics.

Nonvertebrate Chordate Lancelets: The small fishlike creatures called lancelets that live on the sandy ocean bottom. - Have a closed circulatory system - Do not have a true heart

Can you tell me the characteristics of a chordate? (there are 4) a dorsal hollow nerve cord a notochord a pharyngeal pouches a tail that extends beyond the anus

Tunicates and Lancelets Can you tell me the two groups of nonvertebrate chordates? Tunicates and Lancelets

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