Douvillina arcuata from Iowa

In line with my previous post regarding Protodouvillina, here are some examples from the upper Devonian of Iowa.

Pedicle valve

Anterior

Interior of Pedicle valve

Posterior

Profile

Here is a second specimen

Pedicle valve

Anterior

Interior of the Pedicle valve

Posterior

Profile

Four different specimens to show the variation within the species.

A Thank You goes out to my friend Nathan for giving me these specimens that he collected from the Cerro Gordo Member of the Lime Creek Formation (Fransian stage of the Devonian) near Rockford, Iowa.