Molecular phylogeny suggests transfer of Hemidiscus into Actinocyclus (Coscinodiscales, Coscinodiscophyceae)
2017
Gómez, Fernando | Wang, Lu | Hernández-Becerril, David U. | Lisunova, Yuliya O. | Lopes, Rubens M. | Lin, Senjie
Hemidiscus cuneiformis , type of the family Hemidiscaceae, is a diatom with a distinctive semi-circular shape in valve view. A strain of H. cuneiformis was established from the coastal region of the tropical southwestern Atlantic Ocean off Brazil. Cells of this strain showed semi-circular to asymmetrically elliptical valves, indicating morphological plasticity. In the small subunit (SSU) rDNA phylogeny, the type species of Hemidiscus branched between two clades of Actinocyclus , one of which was a sister group, the other in a basal position. Beyond cell shape, there are no significant morphological differences between Hemidiscus and Actinocyclus . We propose the transfer of H. cuneiformis and H. kanayanus into Actinocyclus . The family Hemidiscaceae remains for the genus Actinocyclus .
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