*habitat- fresh water and marine water.
*mouth is jawless and they are called jawless fishes.
*body is eel like and tail is compressed
*skin is soft and scale less
*head and brain is poorly developed
*unpaired fins are present
*paired fins and associated girdles are absent
*endoskeleton is cartilaginous
*stomach is absent.
*respiratory organs are gills
*heart is two chambered
*there are 10 or 8 pairs of cranial nerves
*lateral line sense organs are present
*fertilization is external.
*they are mostly parasite on some fishes
*e.g.-Lamprey, Hag fish
*mouth is jawless and they are called jawless fishes.
*body is eel like and tail is compressed
*skin is soft and scale less
*head and brain is poorly developed
*unpaired fins are present
*paired fins and associated girdles are absent
*endoskeleton is cartilaginous
*stomach is absent.
*respiratory organs are gills
*heart is two chambered
*there are 10 or 8 pairs of cranial nerves
*lateral line sense organs are present
*fertilization is external.
*they are mostly parasite on some fishes
*e.g.-Lamprey, Hag fish
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