shark

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 classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus, as well as other Chondrichthyes such as the holocephalid eugenedontidans. Under this broader definition, the earliest known sharks date back to more than 420 million years ago. Acanthodians are often referred to as "spiny sharks"; though they are not part of Chondrichthyes proper, they are a paraphyletic assemblage leading to cartilaginous fish as a whole.
Since then, sharks have diversified into over 500 species. They range in size from the small dwarf lanternshark (Etmopterus perryi), a deep sea species of only 17 centimetres (6.7 in) in length, to the whale shark (Rhincodon typus), the largest fish in the world, which reaches approximately 12 metres (40 ft) in length. Sharks are found in all seas and are common to depths of 2,000 metres (6,600 ft). They generally do not live in freshwater although there are a few known exceptions, such as the bull shark and the river shark, which can survive and be found in both seawater and freshwater. Sharks have a covering of dermal denticles that protects their skin from damage and parasites in addition to improving their fluid dynamics. They have numerous sets of replaceable teeth.
Well-known species such as the great white shark, tiger shark, blue shark, mako shark, and the hammerhead shark are apex predators—organisms at the top of their underwater food chain. Many shark populations are threatened by human activities.

View More On Wikipedia.org
  1. m28 red

    For Sale Paul & Shark sweater, Diesel jeans, Nike Air Max 90

    Having a clear out.. all items are in fab condition and from a smoke free home.. check out my feedback from other designer clothing sales 👍 1. CP Company goggle hoodie £95 inc delivery SOLD 2. Paul & Shark Bretagne full zip sweater £55 inc delivery SOLD 3. Paul & Shark hoodie £40 inc...
  2. raigraphixs

    Into The Deep 🦈(TBC) Shark movie directed by Christian Sesma

    Oh dear Richard Dreyfuss is teaming up with Section 8 director Christian Sesma for a shark movie 🥴 Stuart Townsend, Jon Seda, AnnaMaria Demara, Ron Smoorenburg, Lorena Sarria, Callum McGowan, Maverick Kang Jr., Tom O’Connell, and Tofan Pirani and Scout Taylor-Compton (Halloween)...
  3. KaspersBones

    Shark IZ300UK Duct Hose

    Hi, I have a Shark IZ300UK Cordless Hoover and the Duct Pipe has split, I could use Silicon Tape to patch it up but I would prefer a more permeant fixture, I have searched on the Internet for this part but all I can find is mostly for the HV models.. Is there a Duct Pipe from another model that...
  4. raigraphixs

    The Devil's Mouth (TBC) Jeff Wadlow, shark movie

    Another day another shark movie 😂 https://www.hollywoodreporter.com/movies/movie-news/cannes-2023-jeff-wadlow-shark-thriller-devils-mouth-1235492395/ https://bloody-disgusting.com/movie/3762375/the-devils-mouth-fantasy-island-filmmaker-jeff-wadlow-directing-shark-attack-horror-movie/
  5. raigraphixs

    Deep Water (TBC) directed by Renny Harlin 🦈

    https://bloody-disgusting.com/movie/3762213/deep-water-deep-blue-sea-director-renny-harlin-is-making-a-new-shark-attack-horror-movie/
  6. Garrett

    Anyone Converted A Normal Car Roof Aerial To A Shark Fin One?

    What I mean by normal is one that's has a bolted on the roof base with a screw crew in aerial coming out of the back something like 30%. Seen videos of it but just wondering if anyone has hands on experience with a non genuine car make one, so how strong the fin, and what the reception like and...
  7. Phreakishe

    Question Is it possible to connect Fat Shark Dominator V1 Goglles to Computer for Drone Simulator Play

    Im trying to figure out if I can connect the Fat Shark Dominator V1 Goggles to the computer so that I can practice dronepiloting at home with goggles and not a computerscreen. Is it possible. I have the oportunity to get these goggles from a neighbour for a very low price.
  8. T

    Shark iz201 spare batteries

    Hi, Wonder if anyone knows of any places, other than direct from shark, to buy additional batteries? Also, the battery pack from shark, does that include a charger, as well as the battery? Thanks Tony
  9. B

    So anyone got one of these new Shark vacs? Any good or Dyson still the best?

    New vac time and instead of buying cheap ones ie £60 every 2 years we are buying a decent one. Boiled it down to these 2, anyone used the new Shark ones, any good? We have a large dog who malts a lot so need a good pet one. Shark DuoClean NV801UKT Powered Lift-Away True Pet Vacuum or Dyson...
  10. S

    Loan shark

    Please don't judge, but I'm in desperate need of a loan shark in the uk
Back
Top Bottom