Cosmoid scales True cosmoid scales can only be found on the Sarcopterygians. The inner layer of the scale is made of lamellar bone. On top of this lies a layer of spongy or vascular bone and then a layer of dentine-like material called cosmine. The upper surface is keratin. The coelacanth has modified cosmoid scales that lack cosmine and are thinner than true cosmoid scales.
Cosmoid scales True cosmoid scales can only be found on the Sarcopterygians. The inner layer of the scale is made of lamellar bone On top of this lies a lay.er of spongy or vascular bone and then a layer of dentine-like material called cosmine. The upper surface is keratin. The coe.lacanth has modified cosmoid scales that lack cosmine and are thinner than true cosmoid scales