[2] They were an exceptionally diverse group of brachiopods, and within the group the Strophomenids of the early Paleozoic and Productids of the late Paleozoic hugely contributed to the immense diversity.

The common features of the Strophomenates include: An order that contains the suborder Clitambonitidina (and others?)

Originating in the Early Ordovician and persisting until the Carboniferous, the Strophomenids were an extremely diverse order.

Microstructural features of the Strophomenid shell include a cross-laminar structure, and a pseudopunctate laminar layer often found with taleolae.

[2] Well-known Strophomenids include Leptaena, Sowerbyella, Rafinesquina, and Strophomena.