Fenchel & D.J.Patt. (Fenchel & Patterson, 1988: 19, figs 1–18)
Preisig et al. (1991: 381, fig. 23.3e, f), Vørs (1992a: 55, fig. 26b, c), Patterson et al. (1993: 79, figs 4H–J, 7A), Tong et al. (1997: 99, fig. 5G)
Cells naked, reniform, with a slightly flattened and unornamented ventral surface, 3–10 µm long, biflagellate, motile or sessile, uninucleate, without chloroplasts. Flagella 5–8 µm long, inserted subapically on ventral side, often from a conspicuous pocket over which hangs a lip-like protrusion; anterior flagellum usually directed forward, with 2 rows of fine hairs on either side; posterior flagellum trailing. Sessile cells attached to substratum by the tip of the posterior flagellum, with the anterior flagellum beating in a spiral fashion and directing a current of water onto the cell body. A suspension-feeding protist.
Southern Ocean, south of Australia; Arctic Canada (Vørs, 1993a); Baltic (Fenchel & Patterson, 1988); Antarctic and Greenland (Vørs, 1992a).
Cafeteria is a genus of small, bacterivorous zooflagellates that are especially common in marine sediments and “marine snow” particles (Fenchel & Patterson, 1988). Species concepts are based primarily on external morphology, and only the type species, C. roenbergensis, has been characterised in detail at the ultrastructural and molecular levels. Cafeteria cells reproduce asexually by binary division; cysts or other resting stages are unknown, and sexual reproduction has not been described.