ECHINODERMATA : Forcipulatida : AsteriidaeSTARFISH, SEA URCHINS, ETC.

Marthasterias glacialis (Linnaeus, 1758)


 image: margla
Marthasterias glacialis

Description: This starfish is large and has five very spiny arms. Each arm bears three longitudinal rows of spike-like spines surrounded by large cushions of pedicellariae. Smaller spines may be scattered between these rows. The spines are white and usually purple-tipped and the animal varies in colour from dirty brown to greenish-grey with purple tips to the arms. Up to 35cm or more in diameter.

Habitat: This species may be found in a very wide range of habitats from sheltered muddy sites to fully exposed rockfaces. Specimens from sheltered sites are usually larger than those from exposed sites.

Distribution: Apparently confined to the southwest and west coasts of the British Isles, also north to Scandinavia.

Similar Species: Small individuals might be mistaken for Leptasterias muelleri.

Key Identification Features:

  • Large spines forming three main rows along each arm.
  • Spines surrounded by a wreath of pedicellariae.
  • Spines usually white with purple tips.

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

iNaturalist: Marthasterias glacialis at iNaturalist World Species Observations database.

WoRMS: Marthasterias glacialis at World Register of Marine Species. Accepted name: Marthasterias glacialis (Linnaeus, 1758). AphiaID: 123803.

Classification: Biota; Animalia; Echinodermata; Asterozoa; Asteroidea; Ambuloasteroidea; Neoasteroidea; Forcipulatacea; Forcipulatida; Asteriidae; Marthasterias

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 Picton, B.E. & Morrow, C.C. (2024). Marthasterias glacialis. (Linnaeus, 1758). [In] Encyclopedia of Marine Life of Britain and Ireland.
https://www2.habitas.org.uk/marbiop-ni/speciesaccounts.php?item=ZB2000. Accessed on 2024-06-17