Myophorella (Formerly Trigonia) is commonly found in the mid to upper Jurassic and particularly associated with Portland stone.
This specimen is 9cm x 3cm x 3cm and held by the University of Southampton.
The specimen’s fossilization is that of an internal mould, of which the calcite shell is bilaterally symmetrical and hosts calcite nodules called Tubercles which act to make it difficult to remove from sediment.
The Myophorella’s mode of life would have been Benthic Infaunal (shallow burrowing) with the triangular streamlined shell assisting with burrowing/ movement through substrate.
Links to extra info
http://www.southampton.ac.uk/~imw/Corallian-Fossils.htm
http://www.ucl.ac.uk/~ucfbrxs/Homepage/walks/PortlandFossils.pdf
https://natureinfocus.blog/2014/03/05/fossils-of-the-trigonia-clavellata-formation-at-ringstead/
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