Halecopsis insignis

Halecopsis insignis is the currently the only described species of the Gonorynchiformes Order from the London Clay. This species of Milkfish was relatively small, and are one of the more frequently found fish in the London Clay including examples from Sheppey (Division D/E) as well as Seasalter, Kent (Division A3/B1). When found, it is very often only the rear of the skull as the streamlined point at the front of the skull is often missing as with all of the specimens showcased below.

Distinguishing Characteristics:

No evidence of sclerotic ossicle in eye orbit (1)
Distinct raised ridge with radiating lines on Preoperculum (2)
Large fenestra opening on top of skull (3)

Primary Example: Fred Clouter, 2005

Additional Example: Fred Clouter, Seasalter SS338

3D Scan - Fred Clouter, Seasalter SS338

3D scans undertaken by Tom Sermon with permission.

Micro-CT Scan - Fred Clouter, Seasalter SS338

3D scans undertaken by Tom Sermon with permission.

Additional Example: Fred Clouter (example with flank)

3D Scan - Fred Clouter

3D scans undertaken by Tom Sermon with permission.

Additional example: Fred Clouter SH433

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