Contributed by Molly Phillips
Micrabaciidae is a family of deep sea corals that are solitary, free living, and described as “button shaped.” When a coral is described as solitary it means that they consist of one single polyp living alone compared with living colonially. Colonial corals, like the many species that form coral reefs, are what most people think of when they think of corals, but there are also many solitary coral species including over a dozen species of deep sea corals found in the Micrabaciidae family.

References
Joan Murrell Owens and the Button Coral by Sarah Pedry on the Hairpin
Owens, Joan Murrell (4 June 1986) "Rhombopsammia, a New Genus of the Family Micrabaciidae (Coelenterata: Scleractinia)." Proceedings of the Biological Society of Washington. 99 (2): 248–256.
Owens, Joan Murrell (30 December 1994). "Letepsammia franki, a New Species of Deep-Sea Coral (Coelenterata: Scleractinia: Micrabaciidae)." Proceedings of the Biological Society of Washington. 107 (4): 586–590.