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3 Cards in this Set
- Front
- Back
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List 7 characteristics of Super Class Agnatha.
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- They lack jaws
- Round, muscular mouth with rows of teeth - Feed by suction of the mouth - Cylindrical and elongated body - They lack paired fins - They lack the scales of most fishes - They lack a true vertebrae |
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Respiratory features and reproduction in hagfishes
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Hagfishes have a single nostril, through which water is taken in and used to ventilate the gas-exchange surfaces of their gill pouches before being discharged back to the ambient environment through gill slit. A single, elongated gonad on the front part of hagfishes develops into an ovary in females, and the back part into a testis in males. They way the egg gets fertilized is still unknown. They do not have a larval stage.
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Respiratory features and reproduction in lampreys
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They can pump water into and out of there seven gill cavities through separate gill slits. This ability allows lampreys to ventilate water over their gills, even though their mouth may be actively used for feeding or sucking on rocks. They spend their adult life at sea or in a lake and swim upstream to their breeding sites. They have a long larval stage.
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