Question

Petromyzon can be distinguish by scoliodon by the presence of

Answer 1

Answer:

Scoliodon is a genus of requiem sharks in the family Carcharhinidae. .

Answer 2

Answer:

Petromyzon (Lamprey) is an instance of Class Osteichthyes . Scoliodon (Dog fish) is an   examples of Class Chondrichthyes.

Explanation:

Chondrichthyes refers to a category of fishes that consists of people with a cartilaginous skeleton even as Osteichthyes refers to a category of fishes that consists of people with a bony skeleton.

Class- Chondrichthyes                                     Class- Osteichthyes

1. The mouth is located ventrally and the frame is included with placoid scales.                                1. The mouth is located apically and frame is         included with cycloid or ctenoid or ganoid scales

2. Gill slits, commonly 5 pairs, open sepa­rately and at once to the exterior.                           2. Gill slits, commonly 4 pairs, open in a gill chamber.

3. The endoskeleton is cartilaginous.     3. The endoskeleton is bony with amphicoelous vertebrae.

4. Operculum continually absent.

Examples- Sharks and chimaeras.    4. Operculum with branchiostegal mem­brane continually present.

                                                               Examples- Lungfish and coelacanth        

These are the difference between class of petromyzon and scoliodon.

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