It should be of no surprise to me to find Parazyga hirsuta in the Centerfield mbr. of the Ludlowville formation (Devonian, Givetian stage). After all, the Centerfield mbr. corresponds to the Hungry Hollow mbr. of the Widder formation in Ontario, Canada. Below are a couple of examples of the species which I first identified here.
Specimen #1 - Pedicle valve
Anterior
Brachial valve
Posterior
Profile
Specimen #2 - Pedicle valve
Anterior
Brachial valve
Posterior
Profile
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