Gigantoproductus


Gigantoproductus is a genus of extinct brachiopods in the order Productida and the family Monticuliferidae. The species were the largest of the carboniferous brachiopods, with the largest known species ranging in size from 9 to 12 centimeters. Productids date back to approximately 407 million years ago. As fossils, their shells occur within a limestone matrix.