scleractinia coral fossil specimen for education. scleractinia,

alcyonacea anatomy animal aquaculture aquatic background beautiful biodiversity biology brain cells colonies column coral coralreef corals detail diversity education egypt fossil gorgonian holaxonia holiday marine medusa nature ocean polyp polyps reef scleractinia scleraxonia sclerites soft specimen spiny stinging stony symbiosis symbiotic texture triassic tropic tropical undersea underwater white