▁O phi ura ▁alb ida ▁is ▁a ▁species ▁of ▁brit t le ▁star ▁in ▁the ▁order ▁O phi ur ida . ▁It ▁is ▁typically ▁found ▁on ▁the ▁se ab ed ▁in ▁the ▁north ▁eastern ▁Atlantic ▁Ocean ▁and ▁in ▁the ▁Mediter rane an ▁Sea ▁and ▁is ▁sometimes ▁known ▁as ▁the ▁ser pent ’ s ▁table ▁brit t le ▁star . ▁ ▁Description ▁O phi ura ▁alb ida ▁has ▁a ▁central ▁disc ▁reaching ▁a ▁diameter ▁of ▁about ▁ ▁and ▁five ▁arms ▁up ▁to ▁ ▁long . ▁The ▁disc ▁is ▁fl atten ed ▁and ▁the ▁upper ▁surface ▁is ▁covered ▁in ▁small ▁pl ates . ▁These ▁are ▁mostly ▁brick ▁red ▁but ▁the ▁pl ates ▁at ▁the ▁edge ▁of ▁the ▁disc ▁close ▁to ▁where ▁the ▁arms ▁are ▁attached ▁are ▁white . ▁The ▁arms ▁are ▁sl ender ▁and ▁frag ile , ▁segment ed ▁and ▁gradually ▁tap ering . ▁The ▁pl ates ▁on ▁the ▁upper ▁and ▁lower ▁sides ▁have ▁convex ▁edges . ▁Each ▁segment ▁has ▁three ▁short ▁sp ines ▁which ▁lie ▁flat ▁on ▁the ▁surface ▁and ▁there ▁are ▁small ▁por es ▁between ▁the ▁pl ates . ▁This ▁latter ▁fact ▁helps ▁to ▁distinguish ▁this ▁species ▁from ▁the ▁otherwise ▁very ▁similar ▁O phi ura ▁o phi ura . ▁The ▁unders ide ▁of ▁the ▁disc ▁is ▁a ▁pale ▁colour ▁and ▁has ▁a ▁central ▁mouth ▁with ▁five ▁large ▁pl ates ▁modified ▁as ▁j aws ▁and ▁fr ing ed ▁with ▁teeth . ▁ ▁Distribution ▁and ▁habitat ▁O phi ura ▁alb ida ▁is ▁found ▁at ▁depth s ▁down ▁to ▁about ▁, ▁or ▁ ▁according ▁to ▁one