Deadly Sharks 4K Live Wallpap

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.
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