Cryptomonads are characterized by oval cell of constant shape, obliquely cut at the anterior end, with a pronounced ventral groove, equipped at the anterior end in the region of the pharynx with two flagella – long, bearing two rows of simple mastigonemes and short, bearing one row of mastigonemes and two apical filaments. Mitochondria with flat cristae. Plastids of autotrophic forms contain a nucleomorph, chlorophylls a and c, as well as a number of additional pigments (phycoerythrin, phycocyanins). There are primary colorless (Goniomonas
) and secondarily colorless (Chilomonas
) cryptomonads. Katablepharids are heterotrophic flagellates the structural plan of which is comparable to that of cryptomonads, but differs in a more developed digestive apparatus, the nature of the flagellar membrane, and tubular mitochondrial cristae.References
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