Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha[1] (or Selachii) and are the sister group to the Batoidea (rays and kin).

Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and …

Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven-gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are...

Shark is the common name for any member of several orders of cartilaginous fish comprising the taxonomic group Selachimorpha (generally a superorder) of the subclass Elasmobranchii of the class Chondrichthyes.

2020年8月11日 · Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays. There are over 500 species of sharks. Some of the better-known species include the tiger shark,...

Sharks (superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 440 million years ago, before the time of the dinosaurs .

2023年5月5日 · Sharks (Selachimorpha) are a group of cartilaginous fish that have played a significant role in marine ecosystems for over 420 million years. With more than 500 species of sharks inhabiting a wide range of aquatic environments, their diversity and evolutionary success are truly remarkable.

Sharks (Selachimorpha) are iconic marine predators that have survived multiple mass extinctions over geologic time. Their prolific fossil record is represented mainly by isolated shed teeth, which provide the basis for reconstructing deep time ...

2023年3月3日 · Modern sharks are members of the superorder Selachimorpha (or Selachii). It is one of two members of the Elasmobranch subclass, the other being the skates and rays superorder Batoidea. Sharks live in all seas and can be found at depths up to 6,600 feet.

Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays.