Juvenile Mediospirifer "Angustus"(?) from the Centerfield mbr.

While sorting through some of the fossils that I've found while searching the eroded remnants of the Centerfield mbr. of the Ludlowville Formation, I found this small brachiopod that bears a striking resemblance to another I've found: Mediospirifer "Angustus". The previous specimen I found was from the Hungry Hollow mbr. of the Widder formation near Arkona, Canada. The Centerfield mbr. of the Ludlowville Formation correlates to the Hungry Hollow mbr. so it is entirely possible that this specimen is a juvenile example of the species.

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

Note that this specimen has the same deep, straight interarea on the posterior as the specimen from Hungry Hollow as well as the wider-than-deeper overall structure.

Both the Hungry Hollow mbr. and the Centerfield mbr. are dated to the Givetian stage of the middle Devonian.