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 appearance of punctate shells during the mid-Ordovician period is associated with the formation of the Dalmanellidina suborder. The Ordovician's high biodiversity contributed to the emergence of numerous genera within this order, but their numbers declined significantly at the end of the Ordovician extinction event.