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35.2 Cyclostomata: Jawless Fishes
Most of the jaw less fishes that were known from the fossil record became extinct by the end of the Devo Reptilianian period.
Both the marine and freshwater environments have been found with the addition of Lampreys.
The characteristics of hagfish and lampreys will be examined in this section.
The hagfish skeleton is made up of a notochord and a cartilaginous skull.
The lack of a column leads to flexibility.
Hagfish live close to the muddy bottom in the cold waters of the northern oceans.
Hagfish have a keen sense of smell and are attracted to dead and dying fish.
They attach themselves to the fish with toothed plates.
The tongue rasps off tissue.
The hagfish can't see approaching preda tors, but they have special glands that produce a lot of slime.
When provoked, the hagfish increases its production of dramati cally, which can be used to distract or interfere with breathing.
Hagfish are able to sneeze to free their nostrils.
The lamprey has a notochord surrounded mouth.
There is a sea by a cartilaginous rod.
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