Fig. 2

A, B Jurassic sp. A from the Oxford Clay Formation of locality ll (Somerset). The main characteristics of this ‘morphospecies’ are the large size, curved rostrum and crenulated margin: C, D Jurassic sp. B from the Lias Group mudstones of the Dorset Coast east of Charmouth. The main characteristics of this ‘morphospecies’ are the distinctly hooked rostrum and wide, rounded, margin with no signs of any crenulations: E, F Jurassic sp. C from the Oxford Clay Formation of locality Vll (Somerset). The main characteristics of this ‘morphospecies’ are the smoothed outline, with no crenulations on the margin and markings that look like the veins of a leaf. The structure of these features, and their purpose, is completely unknown as they have not been seen in any of the other ‘morphospecies’: G Jurassic sp. D from the Wattonensis Bed, Frome Clay Formation, Upper Bathonian (Jurassic) of the Rodden Hive Point section (see Hart et al. 2009 for location details). Scale bar is 1 mm