Actinodendron arboreum is a branching, highly venomous sea anemone (family Actinodendridae) found in shallow Indo-Pacific reef and sandy-bottom habitats. Its distinctive arborescent body plan features a central column with multiple branch-like projections bearing thousands of nematocyst clusters capable of inflicting severe stings. The species is nocturnal, typically expanding fully at night to feed on zooplankton and small prey. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.