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WHAT IS A: SHARK

You, see a shark,but the question is,

do you know that much about

sharks?

Well now,you going to know about

sharks.


SHARKS:are group of elasmobranch fishcharacterised 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 sade(or selachii) and are the sister group to the rays.however, the term "shark" has also been incorrectly used for extinct members of subclass elasmobranchii outside the salachimorpha,such as cladoselache and xenachantus,as well as other chondicthyes such as the holocephalide ugenedontidans.


SHARKS:

Temporal range:late silurian

-present 420-0 Ma

possible ordavician record


Types of sharks you need to know:

spinydogfish,Australian angelshark,whale shark,

Great white shark,horn shark,frilled shark,scalloped hammerhead,japanese sawshark

These sharks all represents the orders or the above tribes

Squaliformes,

Squatiniformes,

Orectolobiformes

, Lamniformes,

Heterodontiformes,

Hexanchiformes,

Carcharhiniformes

and Pristiophoriformes respectively.


Author: L.NONGCO

1 Août 2021 22:26:15 0 Rapport Incorporer Suivre l’histoire
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