Visible are in top view single cells on the upper left-hand and upper right-hand sides, a two-cell coenobium in the center, and several four-cell coenobia. In addition, several remnant cell walls can be seen in the lower left corner. Credit: David Nobles (Culture Collection of Algae UTEX)

Maximum-Likelihood phylogeny generated by FastTree for Scenedesmus dimorphus UTEX 1237 and related species.

The species Scenedesmus dimorphus (Meyen) Kützing 1834 is now known under the synonym Tetradesmus dimorphus (Turpin) Wynne. The original description by Kützing was ”Corpusculis quaternatim conjunctis, 3 punctatis, ellipticis, binis intermediis rectis, binis ulterioribus opposite extrorsum curvatis. Achnanthes dimorpha Turp. 1. c. fig. 12 mit voriger”.

Although occurring as single cells, cells are mostly found in coenobia of two to four cells, because one mother cell can release multiple daughter cells. As the cells and coenobia of this species look similar to those of other Scenedesmus species, for example Scenedesmus obliquus or Scenedesmus acutus, traditionally the classification of isolates has been difficult.

As shown in the figure, the strain UTEX 1237 falls into a clade with other strains that are known as Scenedesmus obliquus (Meyen) Kützing 1834.

Information about the strain UTEX 1237 can be found on the website of the Culture Collection of Algae The University of Texas at Austin: https://utex.org/products/utex-1237?variant=30991931965530