The brush of a male shark with many denticle like spines up to 16 mm long. The weird "spine and brush" structure on the back of this male Stethacanthus may have served as a sexual signalling device, making it easier for females to pick out potential mates, or was perhaps used in combat by males. Like many early sharks, Stethacanthus was only a few feet long. From Bearsden, Glasgow.
Size: 147mm by 75mm on block 155mm by 95mm
Size: 147mm by 75mm on block 155mm by 95mm