The katablepharids, a group of heterotrophic flagellates, have been considered as part of the Cryptophyta since katablepharids were described in 1939. Although they differ from other cryptophytes and have even been proposed to be alveolates, early 21st century research suggests they are related to cryptophytes.
As of 2009, only five genera and ten species have been formally described. Dozens of other DNA sequences (both freshwater and marine) seem to represent further katablepharids which have not been cultured or formally described.
Based on studies done by Cavalier-Smith, Chao & Lewis 2015
Super Class Leucocrypta Cavalier-Smith 2015 stat. n. [Kathablepharidophyta (sic)Okamoto & Inouye 2005]Class Leucocryptea Cavalier-Smith 2004 [Kathablepharidea (sic) Okamoto & Inouye 2005; Kathablepharidophyceae (sic) Okamoto & Inouye 2005]Order Katablepharida Cavalier-Smith 1993 [Kathablepharida (sic)]Family Katablepharidae Vors 1992 [Kathablepharidae (sic)]Genus Roombia Okamoto et al. 2009Species R. truncata Okamoto et al. 2009Genus Leucocryptos Butcher 1967Species L. marina (Braarud 1935) Butcher 1967 [Bodo marina Braarud 1935; Chilomonas marina (Braarud 1935) Halldal 1953]Genus Platychilomonas Larsen & Patterson 1990Species P. psammobia Larsen & Patterson 1990Genus Hatena Okamoto & Inouye 2006Species H. arenicola Okamoto & Inouye 2006Genus Katablepharis Skuja 1939 [Kathablepharis (sic)]Species K. japonica Okamoto & Inouye 2005Species K. obesa Barlow & Kugrens 2002Species K. tenuis Barlow & Kugrens 2002Species K. hyalurus Skuja 1939Species K. notonectoides Skuja 1948Species K. oblonga Skuja 1939Species K. ovalis Skuja 1948Species K. phoenikoston Skuja 1939Species K. remigera (Vørs 1992) Clay & Kugrens 1999 [Leucocryptos remigera Vørs 1992]