Raphidocelis is a genus of green algae in the family Selenastraceae.
[3] One species, Raphidocelis subcapitata, is a common model organism in the field of toxicology, where it is used as a bioassay.
It was previously known as Selenastrum capricornutum, a name later shown to be incorrect.
[3] Raphidocelis is sometimes reported as lacking a pyrenoid; it does indeed contain one, although it is not covered in layer of starch grains making it often difficult to observe under the light microscope.
[4] Raphidocelis reproduces asexually by autospores; zoospores and sexual reproduction have not been observed in this genus.