It need some good photos of ventral side to have a good identification. Probably it is Holothuria arguinensis or Holothuria tubulosa (beached?).
(Recuerde que la regulación de este foro imponga imįgenes de animales en su entorno natural: por lo bajo el agua o varado, pero no se puede llevar fuera del agua un animal marino para tomar fotografķas)
What are the differences between Holothuria tubulosa and Holothuria arguinensis? I can not separate them yet. How they are the most common sea cucumbers here I would like to know how to separate them without any doubt. Thank in advance.