Acontioids: Thick threads (thicker than acontia) attached to the mesentery proximal to the filament. Acontioids contain nematocysts usually belonging to the same categories as those in the filaments (Carlgren, 1949: p.7).

Acontioid Images: (species names are linked to the Hexacorallian database)

Species Nemanthus californicus CAPTION Text-figure 3. *Nemanthus californicus*. Transverse sections of an acontium-like thread.