Wetherellus cristatus is a very rare fish from the London Clay but is the more commonly found of the 3 species of Wetherellus described to date (although Monsch 2005 casts some doubt over whether they are all in fact one species). Wetherellus have a distinctive morphology to the top of the skull (centrally-radiating striations along the frontals) and are fairly wide in skull width. They feature a double row of small, fine teeth and a large sclerotic ring. To date, these have been recorded in Divisions D/E of the London Clay on the Isle of Sheppey.