Marine Reptile - Ichthyosaurs Rib Bone (Partial), Dorset, England (No.73)

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Marine Reptile - Ichthyosaurs Rib Bone (Partial), Dorset, England (No.73)
Ichthyosaurs Rib Bone (Partial)
195 Million Years Ago, Lower Jurassic Period.
from Lyme Regis, Dorset, England

Measurements Approx.
Height - 0.9 cm
Width - 1.7 cm
Length - 5.1 cm

The Ichthyosaurs looked similar to a shark, crossed with later dolphins. Scientist call it "convergent evolution”

Unlike Plesiosaurs, which relied on their paddles to propel them forwards, Ichthyosaurs swayed their tails from side to side like fish.

Hundreds of complete skeletons of the Ichthyosaurs have been discovered. This reptile could grow up to 2m long and weighed 90kg

Ichthyosaurs had very large ear bones. It may have been able to pick up underwater vibrations caused by prey.

Some fossilised skeletons of Ichthyosaurs were found with embryos inside. This shows that Ichthyosaurs gave birth to live young, as opposed to laying eggs.

One of the largest species of Ichthyosaurs was the Shastasaurus, which was over 20 meters long and weighed perhaps 25 tonnes.

Ichthyosaurs were plentiful in Triassic and Jurassic Periods (252-145 Million Years Ago), but became rarer in the Late Jurassic and Cretaceous Period, dying out 66 Million Years Ago.

The name Ichthyosaurs means ‘Fish Lizard’ and fossil remains have been found all over the world - in North and South America, Europe, Russia, India and Australia.