Katablepharid | |
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Scientific classification | |
Domain: | |
(unranked): | |
Class: | |
Order: | |
Family: | Kathablepharidae Vørs 1992
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Genus | |
The kathablepharids (also called katablepharids) are a group of heterotrophic flagellates (Protists) [1] the first species of which was described by Skuja in 1939 as Kathablepharis phoenikoston, (p. 97). [2] His spelling was challenged because of non-compliance with botanical nomenclatural conditions, hence the alternative spelling Katablepharis. As the organism was heterotrophic and usually regarded as 'protozoan', and to favour stability, Skuja's original spelling has largely prevailed. With an anterior pocket and ejectisomes, the kathablepharids were thought initially to be cryptomonads. There were a variety of differences with Cryptomonas and other typical cryptomonads = cryptophytes, such as the thickness, length, and beat pattern of the flagella, their phagotrophic habitat, differences in the ejectisomes, and various features of their ultrastructure. The distinctive characteristics of the group were established from electron microscopical studies by Clay and Kugrens [3] and Vørs. [4] More recently they have been tentatively grouped with the chromalveolates, [5] or distantly with the cryptophytes [6]
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. They are currently placed in the Hacrobia, a tantative grouping of haptophytes, cryptophytes, katablepharids, telonemids, centrohelids, and perhaps biliphytes [1]
Hacrobia |
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Cavalier-Smith, Chao & Lewis 2015 provided the following classification [8]
Katablepharid | |
---|---|
Scientific classification | |
Domain: | |
(unranked): | |
Class: | |
Order: | |
Family: | Kathablepharidae Vørs 1992
|
Genus | |
The kathablepharids (also called katablepharids) are a group of heterotrophic flagellates (Protists) [1] the first species of which was described by Skuja in 1939 as Kathablepharis phoenikoston, (p. 97). [2] His spelling was challenged because of non-compliance with botanical nomenclatural conditions, hence the alternative spelling Katablepharis. As the organism was heterotrophic and usually regarded as 'protozoan', and to favour stability, Skuja's original spelling has largely prevailed. With an anterior pocket and ejectisomes, the kathablepharids were thought initially to be cryptomonads. There were a variety of differences with Cryptomonas and other typical cryptomonads = cryptophytes, such as the thickness, length, and beat pattern of the flagella, their phagotrophic habitat, differences in the ejectisomes, and various features of their ultrastructure. The distinctive characteristics of the group were established from electron microscopical studies by Clay and Kugrens [3] and Vørs. [4] More recently they have been tentatively grouped with the chromalveolates, [5] or distantly with the cryptophytes [6]
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. They are currently placed in the Hacrobia, a tantative grouping of haptophytes, cryptophytes, katablepharids, telonemids, centrohelids, and perhaps biliphytes [1]
Hacrobia |
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Cavalier-Smith, Chao & Lewis 2015 provided the following classification [8]