Description: A large active brittle star with short straight arms and a large disc. Colour varies from dull grey-brown to sandy-orange. The disc is patterned with obvious plates. There are well-developed arm combs with about 30 fine papillae and 3 arm spines. The proximal ventral arm plates are separated by paired holes or indentations. Disc 30mm., arms 3.5x disc diameter.

Habitat: Lives on the surface of sand or muddy sand, occasionally burrowing shallowly. Moves rapidly on being disturbed, by a swimming action.

Distribution: Found all round the British Isles from low tide mark to 200m at least.

Similar Species: Small specimens could be mistaken for other Ophiura species. Ophiura sarsi is equally large but the outer arm combs have only 9-12 rather broad papillae.

Key Identification Features:

• Large disc and relatively short arms.
• Mottled brown disc.
• 20-30 fine papillae in each arm comb.

Distribution Map from NBN: Ophiura ophiura at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Ophiura ophiura at iNaturalist World Species Observations database.

WoRMS: Ophiura ophiura at World Register of Marine Species. Accepted name: Ophiura ophiura (Linnaeus, 1758). AphiaID: 124929.

Classification: Biota; Animalia; Echinodermata; Asterozoa; Ophiuroidea; Myophiuroida; Metophiurida; Euryophiurida; Ophiurida; Ophiurina; Ophiuridae; Ophiurinae; Ophiura