About all Sharks

ABOUT ALL SHAKES

BY. SHAUN LEVY

SHARK FAMILIES:

There are more then 350 know species of sharks today, which send away all be placed under 8 scientific regularizes that contain 30 families. They are placed into these categories by their divided up characteristics, this is called taxonomy. The more closeley related species are placed in another(prenominal) family in the order.

SQUAINIFORMES: The angel shark as they are normally known are characterized by their RAY like flatten bodies. This order has unity family which is called SQUATINDAE that contains about 13 species. The maximum surface that can be attained by any one of these species is 4-6 feet in length.

PRISTIOPHORIFORMES: These shark are known as the see shark. This order has only has one family PHISTOPHORIFORMES which contains five species. These sharks are flaccid to recongnize due to the fact that they posses an ellongated blade like snout that is lined with sharp teething along the edges, thus, the name saw sharks.

SQUALIFORMES: The order possesses three family which consist of about 82 species. These sharks are characterized by their slender, cylinder-shaped bodies, long snouts with shortened mouths.

HEXANCHIFORMES: The Hexanchiformes or cow sharks, comprise of dickens families. Recognized by their six or seven pairs of branchia slits, there sharks can often be launch in deep water.



The frilled shark (CHLAMYDISELACHUS ANGUINEUS) whos appearance is quite seeming(a) due to its eel like appearance, is perhaps one the strangest shark that subsist today.

FOSSIL RECORD:

Shark fossil record is fargmentery at best. Most fossils found so far consist of nothing but teeth in some cases a few vertebra provoke been found. This is old due to the fact that sharks have bones instead, they have cartiladge which countrary common belief is rather solid. In the rarest of cases complete fossil have been discovered.

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