-Animals (Kingdom Animalia)

-Cnidarians (Phylum Cnidaria)

-Sea Anemones and Corals (Class Anthozoa)

-Tube-dwelling Anemones Subclass Ceriantharia

-Order Spirularia

-Family Cerianthidae

Cerianthidae is a family of marine cnidarians commonly known as tube-dwelling anemones, distinguished by their elongated, cylindrical bodies and their habit of living within soft, flexible tubes they construct from mucus and sediment. Unlike true sea anemones, cerianthids have two distinct rings of tentacles: a longer outer ring used for capturing plankton and small prey, and a shorter inner ring surrounding the mouth for manipulating food. They typically inhabit soft-bottom environments such as sandy or muddy seabeds, where only the tentacles extend above the substrate while the body remains protected within the tube. When disturbed, they can rapidly retract completely into their tubes.