Vibrant sea cucumbers, tunicates, hydroids, and other invertebrates cling to a reef in Raja Ampat, Indonesia.

algae animal animal themes animals in the wild aplousobranchia aquatic ascidiacea biodiversity blue bell tunicate bluebell tunicate bohadschia chordata clavelina moluccensis clavelinidae close up colony color image colorful coral coral reef coral triangle day echinoderm echinozoa ecology feeding growth holothuriidae holothuroidea horizontal hydroid hydrozoa indonesia invertebrate macro marine biology melanesia nature new guinea no people outdoors pacific ocean papua pearsonothuria photography porifera raja ampat sea cucumber sea life sea sponge sea squirts southeast asia species sponge symbiosis symbiotic relationship tunicate undersea underwater variation vibrant wildlife zoology