Nematosomes: Globular, ciliated, free-swimming bodies with numerous nematocysts that occur in the coelenteric cavity of Nematostella (Carlgren, 1949: p. 9). Their true nature is unknown.

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

Species: Nematostella pellucida

CAPTION: nematosome with nematocysts undischarged (its flagella shown)

Species: Nematostella pellucida

CAPTION: nematosome after discharge of some of its nematocysts (diagrammatic), only a few of nematocysts shown (long tubes of 3 microbasic mastigophores cut off, as indicated by a line [perpendicular] to tube; smaller nematocysts are basitrichous isorhizas)