Colourless cryptomonads with a rostrate anterior, not phagocytic; furrow/gullet complex consisting of a vestibulum, a short furrow and long tubular gullet; both flagella with a unilateral row of tubular hairs; periplast has an inner single sheet with numerous ejectisome pores and a surface periplast component consisting primarily of fibrils. The periplastidal compartment contains leucoplasts lacking thylakoids numerous large starch grains, and several nucleomorphs located in the periplastidal space near the nucleus. Freshwater.