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Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the division Selachii[1] (or Selachimorpha) [2] and are the sister group to the Batoidea (rays and skates).

Topics on SHARK-L include shark biology, behavior and evolution, stories about diving with sharks, sharks in the media, shark folklore, sharks' relationship with human beings, shark conservation efforts, and resources for shark aficionados. SHARK-L is an informal, conversational list for both lay people and scientists. If you want to talk about ...

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Listed below are extant species of shark. Sharks are spread across 557 described and 23 undescribed species in eight orders. The families and genera within the orders are listed in alphabetical order. Also included is a field guide to place sharks into the correct order. Centrophorus sp. A Not yet described (mini gulper shark)

Where to find my model number? 1. Check the bottom of the box, you should see the model number near the bar code. 2. Check the back or bottom of the main unit, it should have a rating label that shows your model number. 3. Check your manual. Your product’s model number is listed on the front cover of your instruction booklet. How can we help?

1 天前 · Rare footage captured by scientists in New Zealand in 2023 shows an octopus riding on the back of a shark. In a recently released study, scientists say they still aren’t sure how the deep sea ...

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5 天之前 · “The shark seemed quite happy, and the octopus seemed quite happy,” Dr. Constantine said. “It was a very calm scene.” Shortfin makos are the world’s fastest shark, and can swim at top ...

5 天之前 · A aerial view of the octopus catching a ride on top of the shark. (Image credit: Wednesday Davis) Shortfin mako sharks are the fastest shark species in the world, reaching top speeds of up to 46 ...