Manton & Oates (1983a: 519, figs 2–16; type fig. 5c)
Cells ovoid, c. 8 × 6 µm, biflagellate; body covered in unmineralised scales. Body scales of 3 types: 14 large spinous scales at each end of cell, with spine to 15 µm long, tapered, pointed and supported basally by 4 struts attached to base-plate, base-plate strongly convex; large outer plate scales, flat, circular to elliptical, 1.6–2 µm diameter, with a narrow thickened margin, distal surface with a fibrous pattern and bearing 4 vestigial struts, with spine absent, proximal surface patterned with c. 130 fine radiating striae; underlayer of small elliptical plate scales, 0.5 × 0.8 µm, with a narrow raised rim and faint patterning of radial striae on proximal face, patternless on distal face. Flagella c. 18–20 µm long. Haptonema at least 13 µm long when extended.
Southern Ocean, 45.38–52.01°S 134.05–144.20°E, south of Australia; Galapagos Is. (Manton & Oates, 1983a).
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.