CHORDATESCHAPTER 30

• Identify the characteristics that all chordates share

• Explain what vertebrates are.

• Describe the two groups of non-vertebrate chordates

Learning Target 30.1

• 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

The Chordates

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.

1. Tunicates: the larval form has all of the

chordate characteristics.

Nonvertebrate Chordate

2. 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)

1. a dorsal hollow nerve cord

2.a notochord3.a pharyngeal pouches 4.a tail that extends beyond the anus

Tunicates and Lancelets

Can you tell me the two groups of

nonvertebrate chordates?