Hexacorallia

Zoanthids

• Sea anemones ( Actiniaria )
• Black corals ( Antipatharia )
• Disc anemones ( Corallimorpharia )
• Cylinder Rosen ( Ceriantharia )
• Stony corals ( Scleractinia )
• Zoanthids ( zoanthids )
• Rugosa †
• Tabulata †

The subclass Hexacorallia, six-rayed flowers or animals zoantharia comprises six living to this day almost 4,000 orders of over 6000 species of the class of Anthozoa ( Anthozoa ).

The relationship can be detected in young polyps. Because after metamorphosis, the planula larva usually has six tentacles and the stomach area is divided by six longitudinal walls ( septa ). During the polyp grows, new mesenteries and tentacles are added. In this subclass, mainly colony-forming species occur. But solitary living representative are present.

Eight extinct orders, including the Rugosa and the tabulata, you can fossil evidence.

System

The Hexacorallia are one of two subclasses of the Anthozoa ( Anthozoa ), and the sister group of the Octocorallia, which are often also called eight-pointed flowers animals.

Various studies based on morphological and molecular comparisons, see the cylinder roses as basal taxon Hexacorallia and as a sister group of all other. The sea anemones are the sister group to an unnamed clade of anemones, corals, disc anemones and black corals. The phylogenetic position of the extinct orders Rugosa and tabulata remains unexplained.

Sea anemones ( Actiniaria )

Zoanthids ( zoanthids )

Black corals ( Antipatharia )

Disc anemones ( Corallimorpharia )

Stony corals ( Scleractinia )

Cylinder Rosen ( Ceriantharia )

Green Riesenanemone ( Anthopleura xanthogrammica )

Steinkoralle (Acropora palmata )