User:Hemiauchenia/sandboxHelicoprion

Early hypotheses
Due to the unusual morphology of the tooth whorl, the position of the whorl in life and the ecology of Helicoprion have been subject to much speculation. Karpinsky's 1899 description placed the tooth whorl as spiralling upwards from the upper jaw. This interpretation was considered fanciful by Charles R. Eastman, who proposed that the whorl was actually a spine found elsewhere on the body. Karipinsky later proposed that the whorl was actually found on the tail. Numerous other placements have been proposed, including spiraling downwards from the lower jaw and eminating from the fins.

Modern interpretations
In 1966