Thursius pholidotus Traquair

 

This medium to large sized osteolepid is found at the start of the Rousay Subgroup. In the fish beds it is common and in the sediments indicating a shallow water condition only scales and plates of the head can be found. The scales look very much like those of Gyroptychius milleri.

It is a top predator but was probably eaten by the porolepiform Glyptolepis

Complete fish

Head of above specimen

Tail of fish

Head in dorsal view

Reconstruction of fish in lateral view (after Jarvik, 1948 )

Reconstruction of head in A: lateral, B: dorsal and C: ventral view (after Jarvik, 1948 )

Reconstruction (after Agassiz, 1844)