Savigny's long-spined urchin

Cách nhận biết

• Usually black, with a rounded body (called a test) up to about 9 cm across1
• Long, thin, hollow spines that grow in tufts and can reach 25 cm; they are usually black but can be grey, dark brown or purple1
• Juveniles may have bands of lighter and darker shades, and the occasional individual is completely white1
• Iridescent green or blue lines around the interambulacral areas and around the periproct (the cone-shaped region surrounding the anus)1

Hay bị nhầm với: It is very similar to Diadema setosum, which shares much of its range and often lives in the same groups. Savigny's long-spined urchin lacks the thin orange ring around the periproct that Diadema setosum has.1