Class Anthozoa -> Subclass Hexacorallia -> Order Zoantharia
Yellow Polyps are are a close relative of Zoanthus and Palythoa from the Genus Parazoanthus. There are several species of Parazoanthus in the wild, but the most commonly seen species in the reef aquarium hobby are the bright yellow Parazoanthus gracilis.
Yellow Parazoanthus polyps are a beginner-friendly coral. They provide a splash of color in any reef aquarium. Yellow polyps are a fast-growing species and can sting neighboring corals. In higher light, they take on a canary yellow color while in lower light, their appearance is a more muted.