Plate 30. Noctiluca scintillans. Figs. 1-3. LM. Fig. 1. Cells large, balloon-shaped, nearly spherical, and colorless. A single flagellum housed in the ventral groove (arrow). Fig. 2. Cytoplasmic strands extend from nucleus (near the groove) to cell perifery. Engulfed cell (arrowheads). Fig. 3. Asexually dividing cell. Fig. 4. Line drawing. Deep and wide ventral groove (VG) houses the tooth (TO), an extension of the cell wall. Striated tentacle (TE).