Question

Explain the diagnostic characteristics of cyclostomata with suitable examples.

Answer 1

Cyclostomata is a group of agnathans that comprises the living jawless fishes: ... an obstacle to the cyclostome hypothesis. There is at present no consensus on the correct topology.

Answer 2

Answer :

Class - Cyclostomata

• This is a class under phylum chordata.
• These are under Agnatha.
• All the living members of this class are ectoparasites on some fishes.
• They have a longer to body.
• They have gill slits about 16 to 15 pairs of it.
• These gill slits help in respiration.
• They have a su.cking and circular mouth without jaws.
• Their body does does not have scales and paired fins.
• The cranium and vertebral column are cartilaginous.
• Their circulatory system is closed.
• They are marine but migrate to freshwater for spawning.
• After spawning, within a few days they die.
• The Larva after metamorphosis return to the marine habitat.
• Examples of such Pisces are Myxine and Petromyzon.