When it comes to sharks, many people will subconsciously associate it with a downpour. In fact, sharks do sound terrible, and most of them are related to? Cruel? This set is really inseparable, but there are not only large sharks in this world, but also some small sharks. Although they bear the name of sharks, they are very weak. So, what are the ten smallest sharks in the world? Let's get to know each other. The world's smallest ten kinds of sharks

1. Hard-backed pygmy shark

A kind of shark, the hard-backed pygmy shark is very small, only about 3 centimeters, but it also has bioluminescence. Just like its close relative, the spiny mackerel, the hard-backed dwarf shark is also a deep-sea fish with many bioluminescent organs distributed in the abdomen. Researchers believe that the luminous organ helps the hard-backed dwarf shark to blend in with the surrounding luminous environment, making it difficult for predators and prey to distinguish.

2. Small hard-spined shark

For a long time, the small hard-spined shark has been regarded as the smallest shark, but this understanding has been challenged recently because of the discovery of the small lantern shark, and the two are very close. Even so, the hard-spined baby shark still attracts attention; Its maximum length is about 2 cm, which is far from the common shark image of a huge predator roaming the ocean in people's minds.

3. Greenland sharks

Greenland sharks, also known as sleeping sharks with small heads, are widely distributed in the waters of the North Atlantic around Greenland and Iceland at a depth of 1,3m. Greenland sharks are one of the largest sharks, and are famous for their ugly appearance and slow movements. However, they have been found as far south as Argentina and Antarctica. Greenland sharks are called "crocodiles in the sea".

4. Lanterns Shark

Lanterns Shark belongs to the family Sparidae, commonly known as Black Sand, which is located in the deep sea, sand bottom and offshore coast. Living in the continental shelf and the slope around the island near the bottom of the water depth of 15-1,2 meters. Viviparous Feeding on cuttlefish and small bony fish. The longest is about 47 cm, and the male adult fish is 29-42 cm long.

5. Rat shark

Rat shark is a large pelagic shark of the family Muridae. The body is spindle-shaped, the head is conical, and the snout is conical. It has a medium-long conical nose and mouth. The cheek crack is big. The teeth are medium-sized leaves with sharp teeth on the side, and there are small protrusions or "small teeth" on both sides of the teeth. Dermal small teeth are flat and small, with three teeth, of which the median tooth is the longest. Each odontoid has three ridges separated by valleys.

6. Hammerhead Shark

Hammerhead Shark, also known as hammerhead shark, is a general term for the fish of Shark Class and Hammerhead Shark Family. Hammerhead sharks are named after the shape of their heads. The hammerhead shark has two protrusions on the left and right. There is an eye and a nostril on each protrusion. The two eyes are 1 meter apart. A recent study confirmed that the distribution of eyes is very beneficial for it to observe the surrounding situation.

7. White-finned shark

White-finned shark, also known as three-pointed tooth shark, is a shark of the genus Tripointed tooth shark in the true shark family. Named after the tip of the fin is white. There are often white spots at the top of dorsal fin and caudal fin. Growth is slow, only 2 cm -4 cm long every year, and the longest can reach 21 cm. They feed on fish and squid and live in caves and crevices of coral reefs in tropical waters in groups, resting during the day and moving at night.

8. sand tiger shark

sand tiger shark, a shark of the genus cone tooth shark of the family cone tooth shark. Body length, total length 3-3.4m, weight, 95-11kg. Also known as Shark-toothed sand shark and Cone-toothed shark, it is a large shark that lives in coastal waters. It is now distributed in different parts of the Atlantic Ocean, Indian Ocean and Pacific Ocean. Sand tiger sharks are fierce in appearance, but they are often docile. Unless provoked, they are not aggressive.

9. Lemon Shark

Generally, the length of lemon shark is between 8 and 1 feet (about 2.4 to 3 meters), and the largest recorded lemon shark is over 12 feet (about 3.6 meters). The trunk is thick and the head Jinbe is flat. The tail length is less than 1/2 of the body length, and the tail base is concave. The kiss is shorter and the front edge is blunt and round. The eye is small, slightly oval, and has an instantaneous membrane. In China, it is distributed in South China Sea and other sea areas. Lemon sharks inhabit the coastal intertidal zone to the continental shed or island shed with a water depth of 92 meters.

1. Articulated shark

Articulated shark moves in small groups, which is a nocturnal creature to a great extent. It usually lies on the sandy seabed or hides in caves to rest during the day and comes out to hunt at night. The hinged-mouth shark is one of the common shark species in large and medium-sized aquariums. Hinge-mouthed sharks are distributed, occasionally seen in tropical and subtropical waters along the Atlantic and Pacific coasts of America and West Africa, and are most common in the Caribbean.

Because these sharks are the smallest ten kinds of sharks in the world, and even they are only a few tens of centimeters long, in the complicated underwater world, they often hide during the day and come out to feed at night. In addition, the lethality of these sharks is relatively small, mainly because they are relatively small, so they generally don't choose to attack each other unless they are attacked from outside.