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Cyclostomata (Body (elongated body, 6-15 pairs of gill slits for…
Cyclostomata
Body
elongated body
6-15 pairs of gill slits for respiration
cyclostomes have a sucking and circular mouth without jaws
devoid of scales and paired fins
cranium and vertebral column are cartilaginous
Life processes
Circulation
closed
Nutrition
sucking and circular mouth without jaws
Respiration
6-15 pairs of gill slits
Reproduction
migrate to freshwater for spawning
After spawning, within a few days, they die
larvae, after metamorphosis, return to the ocean
MISC.
marine but migrate to freshwater for spawning
Examples
Petromyzon
(Lamprey)
Myxine
(Hagfish)