Haddon's Carpet (S. haddoni) Green
A variant of Carpet anemone (Stichodactyla gigantea)

Representative Carpet anemonephoto — a dedicated image of this exact morph isn't available yet.
The sand-dwelling *Stichodactyla haddoni* sold as a carpet, with a more verrucae-covered disc. Generally considered hardier and less of a wanderer than gigantea.
Keeper tips for this variant
Give it a deep sand bed (4+ inches) to anchor its foot in — unlike gigantea it wants to attach to glass/rock UNDER the sand, so don't place it on bare rock.
Other Sea Anemones variants
Green carpetBlue carpetPurple/pink carpetGreen Carpet AnemonePurple/Blue Carpet AnemoneRed/Pink Carpet AnemoneRainbow / Sunburst Carpet AnemoneMini Maxi (Carpet) AnemoneRainbow Carpet AnemoneHaddoni / Saddle Carpet Anemone (Stichodactyla haddoni)Blue Carpet AnemonePurple Carpet AnemoneUltra Red Carpet Anemone