Eric is a science and technology teacher who is a bookworm and logophile. He often writes about scientific thought, theories and research.
The following are 10 examples of groups or species of sharks.
1. Whale Shark
It is the only member of its genus and family. It is the largest fish and chondrichthyan living today. It can grow up to 12 meters long and can weigh 20,000 kg. They are filter-feeding, feed exclusively on plankton and other small swimmers.
It is not a dangerous living thing, in fact, you can swim with them. However, it is considered a vulnerable animal and protected, never attempt to touch it, or else, you can find or possible prison sentence by just doing it.
2. Hammerhead Shark
It is easily distinguished from other selachimorph by its flattened and expanded hammer-shaped head. The unusual-shaped head improves its ability to find prey.
These strong swimmers usually travel in schools. They do not actively seek out human prey, but are very defensive and will attack when provoked. There are only 17 documented attacks by these pelagic swimmers since 1580 AD and all of them are not fatal.
3. Thresher Shark
It has an unusual, long tail, the length is the same as its body. They use it as a whip to stun prey before feeding them.
They are fast swimmers that will sometimes leap out of the water. It has no records of attacks. They are very timid and skittish. If you swim with them, they will swim away.
4. Swell Shark
The name obtains from its ability to expand when threatened. It gulps water into its stomach, swelling to almost twice its size and becoming difficult to bite. It is also called barking shark due to its dog-like bark sound when it expels the water from the body when the danger past. They are poor swimmers and not aggressive.
They spent their time resting in crevices, caves, and holes, stack on top of each other.
They are the smallest sharks in the world found in deep waters. They have the bioluminescent property, hence the name. Yes, they glow in the dark. They emit light to attract the prey and to hide to the predators. There are lots of lanternsharks species living in the Philippines, include Marsha's, black belly, spiny cheek, and short-tail lanternshark.
6. Great White Shark
They are gray with a white underbelly. These are the largest predatory fish on earth and are fearsome man-eaters. These dangerous creatures are found not only in the Philippines but throughout the world’s oceans, mostly in cool waters close to the coast.
Wobbegongs are benthic creatures, spending their time on the seafloor. They are well camouflaged because of the carpet-like pattern on its body. They also have small weed-like whisker lobes surrounding the jaw, which act as sensory barbels. It is capable to dislocate its jaw to swallow large prey even larger than itself.
8. Cookie-cutter Shark
Like the lanternsharks, these creatures are small, capable to emit light, and inhabit deep waters. Despite the size and location of the habitat, this group of living thing is a nightmare. They are known to travel in school and feed by removing a cookie-shaped chunk from its larger prey using the serrated bottom teeth. They also purposely swallow the loose teeth to recycle the calcium for its body.
9. Basking Shark
It is the only member of its genus and family. It is the second-largest fish after the whale sharks which can grow up to 8 m. They spend their time near the surface of the water with open mouth and filtering out plankton. Females have a gestation period of at least 3 years and give birth to the largest babies of all fishes.
10. Saw Shark
It is easily distinguished by its long saw-like snout. They use it to kill the prey. They move it quickly side to side to cuts its victim into fine chops. They have a pair of barbels in the middle of the snout which acts as a sensory organ.
Pups hatch the eggs inside the mother. While in the mother, pups' teeth are inverted into their mouth to prevent harm. They have litters of 3–22 pups every 2 years.
This content is accurate and true to the best of the author’s knowledge and is not meant to substitute for formal and individualized advice from a qualified professional.
© 2020 Eric Caunca
Eric Caunca (author) from Philippines on September 23, 2020:
JC Scull from Gainesville, Florida on September 11, 2020:
Excellent article about sharks.