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A new species of shark was discovered about 314-384 meters deep in Sotavento, one of the islands of Hawaii. 

The species named, Etmopterus Lailae has an elusive behavior, making it extremely difficult to observe in a wild state. 

Much of this shark’s biodiversity is still unknown because it is very small and lives in very deep waters. This type of shark is bioluminescent which means it glows in the dark. Given this quality, several scenarios have been proposed: it uses its quality to ensure that it mates with the right species, uses it as camouflage and thus defend itself from its predators or uses it as a lure to attract small fish or other prey. 

It is not the first bioluminescent shark that has been discovered until now, but its characteristics differentiate it from other sharks of its type: its head is oddly shaped and has a large, bulging snout where the nostrils and olfactory organs are located , has distinctive side marks that go back and forth over the belly, has fewer teeth and vertebrae than the average shark.

Although for scientists the bioluminescence of this shark is still a mystery, it is a fact that does not take away the brilliance of this interesting discovery.

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How much do you know about the rays? We show you some basics about them. 

1. Rays are fish, although they do not resemble friends with fins in your fishbowl at home, the rays belong to a group of Fish called Elasmobranch. 

1. Around 200 different species of rays have been discovered in total. 

1. The poison of the streaks was used as an anesthetic. Although painful, streak venom is usually not fatal unless the victims are stung in the chest or abdomen. In ancient Greece, the venom was extracted from striped thorns in order to be used as an anesthetic by dentists. 

1. The jaws of the rays can crush the shells of the mollusks. Although the jaws of the rays are cartilaginous, you are strong enough to crush the clam shells and other mollusks. The calcified cartilage in its jaws has several layers of thickness, the softer nuclei of the elements of its jaws are supported by hollow and mineralized struts. This makes the jaws of the rays strong and light at the same time. 

1. Some rays move like waves and others like birds. Most rays swim across the ocean waving their bodies in a wave-like motion. Others depress their sides up and down, giving them the appearance of a bird through their journey into the ocean. 

1. Electric rays are named for their ability to generate and discharge electric currents strong enough to stun their prey or to defend the potential predators that can stalk you. 

1. Rays can vary greatly in size. The smallest ray is the short-nosed electric ray that is approximately 10 cm wide and weighs about 400 g. 

The oceanic blanket is the largest ray that reaches up to 7m in wing length and weighs 2,000 kg.

1. Most shark species drown if they stop moving. White sharks, Mako sharks and salmon sharks (to name a few) do not have the muscles they need to pump water through their mouth and onto their gills. As they continue swimming, the water keeps moving on its gills, keeping them alive. 

1. Sharks’ livers contain a lot of oil. This causes the liver to be a buoyant organ, which helps the sharks to keep the balance in the water. 

1. Sharks do not follow the same routine of three meals a day as humans, they eat when they find food, no matter what time it is. 

1. Surfers are more likely to die from drowning than by a shark attack, but it is true that big white sharks can be confused and feel intrigued by the way of a surfboard. Below the surface, a large white shark could confuse the outline of the board with that of a sea turtle, a seal, a walrus, or a sea lion. 

1. Skeletons of Sharks are made entirely of cartilage, an elastic tissue that is much softer than the bones. When a shark dies, the salt from the ocean water completely dissolves its skeleton, leaving only the shark’s teeth behind. 

1. The eyes of the sharks are on the sides of their heads, so they have an incredibly wide line of sight covering almost 360 degrees. Its panoramic view of the underwater world is inhibited only by two blind spots, one in front of the snout and the other directly behind the head. 

1. Between 30% and 80% of the meat of a shark is made of water. A protein network gives the flesh its structure. 

1. The size of a shark species are defined where they hunt: smaller sharks tend to feed near the bottom of the ocean, and larger sharks hunt in the middle depths and near the surface where they can more easily catch prey Bigger. 

1. When hunting, the sharks stalk their victims, staying far enough away to remain hidden, but close enough to attack when the opportunity arises. 

1. Big white sharks are fussy eaters. Their diet requires a lot of fat, and after a bite a big white shark can determine if the food will satisfy their nutritional needs. If not, the shark will leave the rest and swim away.