Erayga "abactinal" waa tilmaan ugu horayn loo isticmaalo bayoolaji, gaar ahaan marka loo eego echinoderms (sida starfish iyo urchins badda). Waxa loola jeedaa dhinaca ama dusha neefka ee ka soo horjeeda afkiisa ama afka afka. Gaar ahaan, waxay khusaysaa dusha sare ee echinoderm, kaas oo sida caadiga ah leh lafdhabarta ama qaab qallafsan oo inta badan loo isticmaalo difaaca ama goobta.
