Tenellia longiTenellia longi is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Fionidae.DistributionThis species was described from Isla Raza, Baja California, Mexico,.DescriptionThe adult size of this species is up to 32 mm in length. The cerata are cored with green digestive gland and have surface rings of pale blue, yellow-gold and red pigment and white tips.