Undescribed Flatfish #1

This is an absolutely exceptional find by Dan Hogburn and could represent the first ‘flatfish-type’ (Pleuronectiformes) that has been found in the London Clay. This was found in Division D/E of the London Clay on the Isle of Sheppey. Although more research is required, the morphology looks very similar to that of the general body plan of a flatfish with the cranium centred on the flank and both dorsal and anal fins running the length of the body. This specimen could benefit from some further preparation.

Distinguishing Characteristics:

Eye orbit clearly situated on side of flank as with most ‘flatfish’ (1)
Short, robust, toothless dentary (2)
Visible line of pterygiophores to support the dorsal fin which extends the length of the fish (3)
Visible line of pterygiophores to support the anal fin which extends the length of the fish (4)

Primary Example: Dan Hogburn Specimen

Comparison to modern Pleuronectiformes:

References

Casier, E. (1966) Fauna ichthyologique du London Clay. British Museum Natural History London, 1966, 1-496
Monsch, K (2005) Revision of the scombroid fishes from the Cenozoic of England
Raynor, Mitchell, Clouter (2009) London Clay Fossils of Kent and Essex