Long, spindle-shaped cells tapering to sharp points, weakly to strongly curved, row of pyrenoids absent; may cluster together in bundles.
Cells spindle-shaped to cigar-shaped, arranged in roughly parallel clusters of 4, in a faint mucilage envelope.
![[Actinastrum] (sewage pond), X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/actinastrum640__FillMaxWzMwMCwyMDBd.jpg)
![[Ankistrodesmus] (sewage pond), X400. Photo: Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/ankistrodesmus400__FillMaxWzMwMCwyMDBd.jpg)
![[Quadrigula], Lake Rotoiti, X640. Photo: Otago Regional Council & Manaaki Whenua](/assets/Tools-And-Resources/Identification/algae/quadrigula640__FillMaxWzMwMCwyMDBd.jpg)