Rubellatoma diomedeaRubellatoma diomedea, commonly named the red-brown mangelia, is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.DescriptionThe length of the shell attains 10mm, its diameter 4mm.DistributionR. diomedea can be found in the Gulf of Mexico, ranging from the coast of Texas to the Campeche Bank.