Gyracanthus formosus Agassiz.1837.
Acanthodians were primitive shark like fish characterised by bony fin supports. Gyracanthus was the giant amongst them and typical of the Coal Measures. The lower end of one of the 2 dorsal fins showing typical surface striations. From a famous old locality. Ex. Dr F.Kranz ( Bonn). These Gyrancanthus fin spines rarely come up for sale.
Carboniferous, Westphalian Coal Measures.Blackband Ironstone Series.
Airdrie Coalfield, North Lanarkshire, Scotland.
Spine : 13.5 cm long.
