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Lancelets, also known as amphioxus, are chordates that exhibit characteristics such as a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. These features are present at some stage in their life cycle, distinguishing them as chordates.

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Why are sea squirts and lancelets referred to as invertebrate chordates?

They don't have a backbone and have all the characteristics of a chordate.


What is the oldest chordate?

The oldest chordate is believed to be Haikouichthys, which lived around 530 million years ago during the Cambrian period. It had a primitive notochord but lacked true vertebral elements.


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A vertebrate is any chordate that has a backbone or spinal column, which provides support and protects the spinal cord. This distinguishing feature sets vertebrates apart from other chordates like tunicates and lancelets.


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Tunicates and lancelets represent the two groups of jawless fish. All other species of jawless fish have gone extinct.


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How does the zebra exhibit chordate these characteristics?

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Are lancelets ectotherms?

Yes. Lancelets are fish and all fish are ectothermic.


Which subphylum retains all chordate characteristics even in the adult forms?

The subphylum Vertebrata retains all chordate characteristics even in the adult forms. Vertebrates possess a notochord, dorsal nerve cord, post-anal tail, and pharyngeal slits or pouches throughout their lives.


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Being 'chordate' means that the animal has a backbone.