Great White sharks
The modern Great White shark reaches about 23 ft in length and about 4000 lb in weight.
About 60 million years ago (to about 50 million years ago) this shark, Isurolamna inflata, appears.
It still retains the cusplets, and there is no real difference between the front teeth and the side teeth, other than some slant.
Notice how the cusps are still there, but very small. This shark tooth dates to about 55 million years ago,
and is also from Morocco.
Descending from Isurolamnia is Isurus (Carcharodon) hastalis, appearing about 35 million years ago and surviving
to about 2 million years ago. Notice the very triangular shape, with the tooth filling in to the base edges where the cusplets used to be.
This tooth is about 4.5 million years old, and is from the Huarra Formation in Chile. This tooth is full adult size.
Which brings us to the current end-result: the modern Great White shark, Carcharodon carcharias.
A temperate water shark, they appear about 11 million years ago, and resemble the previous tooth except for the addition of the serrated edges.
Oh, and the size: this tooth is only one half of the full adult size of 2.5 inches!
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