The common feature of hag fish dog fish and angel fish
Answers
Explanation:
Hagfish, of the class Myxini (also known as Hyperotreti), are eel-shaped, slime-producing marine fish (occasionally called slime eels). They are the only known living animals that have a skull but no vertebral column, although hagfish do have rudimentary vertebrae.[3] Along with lampreys, hagfish are jawless; they are the sister group to jawed vertebrates, and living hagfish remain similar to hagfish from around 300 million years ago.[4]
The spiny dogfish, spurdog, mud shark, or piked dogfish is one of the best known species of the Squalidae family of sharks, which is part of the Squaliformes order. While these common names may apply to several species, Squalus acanthias is distinguished by having two spines and lacks an anal fin.
Pterophyllum is a small genus of freshwater fish from the family Cichlidae known to most aquarists as angelfish. All Pterophyllum species originate from the Amazon Basin, Orinoco Basin and various rivers in the Guiana Shield in tropical South America.
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Answer:
Common feature of hag fish, dog fish and angel fish is that they are the only known living animals which have skull and no vertebrae.
Explanation:
Hagfish
Hagfish belongs to the class of Myxini and order Myxiniformes. These are eel-shaped and slime producing marine fish. They usually produce slime on the body surface. They are the only known living animal that have a skull but no vertebral column. They do have rudimentary vertebrae.
Dog fish
The spiny dog fish, spur dog, mud shark or piked dogfish are one of the best known species of the Squalidae family of sharks which is a part of the Squaliformes order. While these common names may be apply to various species, Squalus acanthias is distinguished by the presence of two spines and no anal fin.
Angel fish
Pterophyllum is a small genus of freshwater fish from the family Cichlidae which is known to most aquarists as angelfish. All Pterophyllum species originate from the Amazon Basin, Orinoco Basin and various rivers in the Guiana Shield in the tropical South America.
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