Ultrastructure of Calcareous Dinophytes (Thoracosphaeraceae, Peridiniales) with a Focus on Vacuolar Crystal-Like Particles
Figure 5
Vacuolar crystal-like particles.
(TEM). A. Scrippsiella trochoidea var. aciculifera (GeoB 228, note the two matrices surrounding the cell, the middle unit membrane is partly disbanded). B. Thoracosphaera heimii (GeoB 211, note the single matrix that will calcify). C. Calcigonellum infula (GeoB*110, note the two matrices surrounding the cell). D. Pernambugia tuberosa (GeoB*61, note the two matrices surrounding the cell). E. Scrippsiella bicarinata (GeoB 411, early coccoid cell, the theca is still attached). F. Calciodinellum aff. operosum (GeoB 34, note the two matrices surrounding the cell and the protrusions between the outer and inner matrix indicated by arrows). G. Calciodinellum operosum (SZN#74, note the large crystal-like particles). Abbreviations: cb, crystal-like particle; ch, chloroplast; ix, inner matrix; ox, outer matrix; pv, pusular vesicle; py, pyrenoid; st, starch grain; tr, trichocyst; th, thecal plate. Scale bars: 1 µm.