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Write a short note on cyclostomata

Dear student,

Cyclostomata is a group of agnathans that comprises the living jawless fishes: the lampreys and hagfishes. They have cartilaginous skulls and tooth-like structures composed of keratin. Habitat is Marine and fresh water animals and Ectoparasite on some fishes or scavengers. In these species True jaws  and Paired fines are absent. These have two chambered. heart . There Body is long, Thin and tubular. ​They have Complete alimentary canal and they respire with the help of gills.

example, 

 Petromyzon​​​​​​​, . Maxine

​​​​​​​Regards

 

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Cyclostomata

 They have cartilaginous skulls and tooth-like structures composed of keratin.True jaws are absent.
 Hagfish have no true fins and have six or eight barbels around the mouth and a single nostril. Hagfish eyespots when present can detect light, but as far as is known none can resolve detailed images.Some hagfish species are thought to be hermaphroditic, having both an ovary and a testicle .  Paired fines are absent. the nostril is single and median.Notochord present through life. heart is two chambered.

Example:

1. Petromyzon

2. Maxine

 

 
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