The fragile mushroom coral Halomitra clavator Hoeksema, 1989 (Scleractinia: Fungiidae) is known from only a few localities in the central Indo-Pacific (Hoeksema 1989, 1993). It can be distinguished from its more common and widespread congener, H. pileus (Linnaeus, 1758), by its thinner corallum, club-shaped septal spines (opposed to sharp), and cream-coloured coral margin (opposed to violet, Fig. 1).

doi.org/10.1007/s00338-010-0616-3
Coral reefs
Staff publications

Hoeksema, B., & Gittenberger, A. (2010). High densities of mushroom coral fragments at West Halmahera, Indonesia. Coral reefs, 29(3), 691–691. doi:10.1007/s00338-010-0616-3