Hildoceras Ammonite, from Whitby, Yorkshire, England (No.19)

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Hildoceras Ammonite, from Whitby, Yorkshire, England (No.19)Hildoceras Ammonite, from Whitby, Yorkshire, England
175 Million Years, Jurassic Period

Measurements Approx.
Height - 12.3 cm
Width - 4.2 cm
Length - 11.1 cm



Hildoceras had an evolute, laterally compressed shell. The coarse, widely-spaced, sickle-shaped ribbing on the sides is interrupted by a groove.

The suture line is very complex. It has a very distinctive rectangular whorl section, which on the venter carries three low keels separated by two grooves.

Hildoceras was a moderate swimmer in the Early Jurassic shelf seas.

  

  

  


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