single astrangia poculata aka northern star, cup coral. coral reef fossil on brown textured background

single astrangia poculata aka northern star cup coral reef fossil isolated brown textured background underwater fish snorkeling coastline undersea ecosystem biology aquatic caribbean dive marine low hawaii pacific scuba seascape shark tranquility wildlife aquarium lagoon life surface climate change deep australia fantasy growth majestic microbiology reflection research science softness wet fragility geology mineral sand starfish marina rock diving island tide sea