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Cryptomonads-haptophytes assemblage

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Title: Cryptomonads-haptophytes assemblage  
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Subject: Centrohelid, Telonemia
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Cryptomonads-haptophytes assemblage

The cryptomonads-haptophytes assemblage is a proposed monophyletic grouping[1] of chromalveolata that are not included in the SAR supergroup. Several alternative names have been used for the group, including Hacrobia (derived from "ha-" referring to Haptophyta, "-cr-" referring to cryptomonads, and "-bia" as a general suffix referring to life);[2] CCTH (standing for Cryptophyta, Centrohelida, Telonemia and Haptophyta);[3] and "Eukaryomonadae".[4]

As of February 2012, it is unclear whether this group is monophyletic or not; results of phylogenetic studies are "often dependent on the selection of taxa and gene data set".[3] Two 2012 studies produced opposite results.[5][3]


In the past, heterokonts, haptophytes, and cryptomonads have sometimes been grouped together in a group known as chromists.[6] Though the heterokonts are now split out, Cryptophyta and Haptophyta are considered in some studies to be closely related[7][8] (and are sometimes simply referred to as the "Cryptophyta+Haptophyta" group).[9] A 2009 paper suggested that the Telonemia and centrohelids may form a clade with the cryptophytes and haptophytes.[10] The picobiliphytes may belong in this group but are too poorly known to be classified with confidence.[2]

Several recent studies have concluded that Haptophyta and Cryptophyta do not form a monophyletic group.[11] The former are a sister group to the SAR group, the latter cluster with the Archaeplastida (plants in the broad sense).[5] As of February 2012, it remains unclear whether the Hacrobia forms a monophyletic group.[3]


External links

  • Tree of Life: Hacrobia

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