Punctate shells appear during the mid-Ordovician, which establish the suborder Dalmanellidina. The Ordovician is a productive period which gives rise to numerous genera in this order. However, they started to become greatly reduced by the end of the Ordovician extinction event.
The punctate shells that appeared during the mid-Ordovician period are a significant factor in the development of the Dalmanellidina suborder. The Ordovician's rich biodiversity led to an abundance of genera within this order, but their numbers decreased dramatically at the end of the Ordovician extinction event.