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Do we have just the one Sunstar- Common Sunstar, or are there a variety? I think you are right with Sunstar but I just wonder if there could be more than one species.
there is also the purple sunstar, looks a bit more like a regular starfish (smaller sun with larger radial arms)and usually bigger. Not as spiny.
Lat/Lng: 55.0, -5.1
OS grid ref: NX0882