astrangia poculata aka northern star, cup coral. beautiful texture of coral reef fossil on the beach

astrangia poculata northern star cup coral beautiful texture reef fossil beach underwater fish snorkeling coastline undersea ecosystem biology aquatic caribbean dive marine low hawaii pacific scuba seascape shark textured 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