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JURASSIC AMMONITE APTYCHUS - 180 million years old - Whitby, Yorkshire

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Home > FOSSILS > AMMONITES AND THEIR RELATIVES

 
JURASSIC AMMONITE APTYCHUS

180 million years old

Upper Lias (Jurassic period)

Whitby, Yorkshire

 
Although resembling a bivalve shell, this is, in fact, part of a fossil ammonite, although the precise function within the ammonite's shell is still debated.

The aptychus (plural aptychi) is composed of two parts, each a mirror image of the other, which are located in the body chamber of the ammonite. It is very rare for an ammonite fossil to be preserved with the aptychus in place. 

It was previously thought that aptychi served the function of closing the shell aperture against intruders but it may be that they were part of the jaw apparatus.

 
Click on a picture for a larger image


Size:  5 x 4.5 x 1.5 centimetres
Weight: 82 grams

PRICE: £24.00
JURASSIC AMMONITE APTYCHUS - 180 million years old - Whitby, Yorkshire
JURASSIC AMMONITE APTYCHUS - 180 million years old - Whitby, Yorkshire JURASSIC AMMONITE APTYCHUS - 180 million years old - Whitby, Yorkshire JURASSIC AMMONITE APTYCHUS - 180 million years old - Whitby, Yorkshire JURASSIC AMMONITE APTYCHUS - 180 million years old - Whitby, Yorkshire