Diagnostic features
Pseudofilamentous desmid formed by chains of cells, each of which is divided into two slightly bean-shaped semicells by a deep central constriction or isthmus. This constriction is much deeper than in Hyalotheca or Desmidium, the other filamentous desmids in this guide. Each semicell has a single chloroplast.
![[Spondylosium], X400. Photo: Taranaki Regional Council & Manaaki Whenua Image](/assets/Tools-And-Resources/Identification/algae/spondylosiumtrc__ScaleWidthWzEwMjRd.jpg)