Edvardsen, Eikrem & Probert, 2011.
Leadbeater (1972b: pl. 4, fig. 28), Moestrup (1979: 68, fig. 10), Hallegraeff (1983: 496, fig. 6), LeRoi & Hallegraeff (2004: 805, fig. 12)
Chrysochromulina chiton Parke & Manton, in Parke et al. (1958: 225, figs 1–37)
[after Parke et al. (1958)] Cells spherical to ovoid, with a flattened flagellar pole depressed centrally across one axis, typically 5–8 µm diameter, biflagellate; body covered in unmineralised scales. Two types of body scales form a single layer over cell: large scales elliptical, 2.4–2.9 µm long, 1.9–2.42 µm wide, saucer-shaped, with a broad rim and radiating pattern of striae on proximal surface, distal surface patternless; small scales circular to elliptical, 0.9–1.4 µm long, 0.7–1.1 µm wide, otherwise similar to large scales. Flagella equal to subequal, to 25 µm long, typically 2.5–3.5 times body length, arising from slightly off-centre of depression. Haptonema c. 35 µm long, typically 4–5 times body length when extended.
Southern Ocean, south of Australia; New Zealand (Moestrup, 1979); northern seas at 47°36’N 04°18’W (Parke et al., 1958).
Chrysochromulina genus description: Cells have homodynamic flagella and a coiling haptonema, and electron microscopy is usually required to identify the species. As well as being photosynthetic, these fragile haptophytes ingest picoplanktonic and nanoplanktonic organisms by phagocytosis.