[Radiolaria Polycystina] In Nassellaria: lateral apophyses of the thorax usually connected to the shell-wall by siliceous meshwork, derived from external projections of the dorsal and primary lateral spines (shell structure 4).

[Ostracoda] In a few species of pelagic Ostracods the sharp-edged vaults, dorsally of the anterior of the carapace, developed into structures that look like wings (Alacia alata), often armed with spines.