Sharks are the collective name for the general order of sharks, and sharks are divided into tiger sharks, six-branch sharks, porcine sharks, dogfishes and saw sharks.

1. Tiger sharks

There are only 8 species in 1 family, 1 genus, and genus Tiger sharks. The representative sharks of the genus Tiger Shark include Ford's tiger shark, orbital tiger shark, broad-striped tiger shark, Mexican tiger shark, black tiger shark, Guar's tiger shark, white-spotted tiger shark, narrow-striped tiger shark, etc.

2. Hexabranchial shark order

Hexabranchial shark order has 1 family, 3 genera and about 4 species, namely Hexabranchial shark genus, Hexabranch shark genus, Hanagill shark genus and Heptabranchial shark Sharcharia spp. Representative sharks include the gray sixgill shark of the genus Hexagill, the flat-headed hanashark of the genus Hana, and the sharpnose sevengill shark of the genus Sevengill.

3. The order Porphyra

There are 5 families in the order Porphyra, including the family Congodontidae (genus Congodon), Stegodonidae (genus Stegodon), and Mackerel. Sharks (genus Porphyra, Mako, etc.), Basking sharks (genus Basking sharks) and Thresher sharks (genus Thresher sharks).

Carcharhinidae and Acanthopteridae. There are 2 dorsal fins, usually with one spine each, the anal fin disappears, and 5 gill openings, located in front of the pectoral fin base, lateral or superior to the eyes.

5. Sawshark order

There is only one family (Sawsharkidae), 2 genera and 5 species in the order Sawshark, with a body length of up to 4 meters and a very long snout. Representative sharks include six-gill sawshark, longnose sawshark, Japanese sawshark, shortnose sawshark, Bahamas sawshark, etc.