Protocallinassa sp. claw from the Navesink formation

As a companion piece to the Ophiomorpha nodosa burrows I posted last week, here is a partial claw from the arthropod that lived in the burrows. It's called Protocallinassa and was a ghost shrimp that lived on the seafloor scavenging for food. It's not too commonly found as the exoskeletons often fell apart in the water current after death.

I found this fossil at Big Brook near Marlboro, Monmouth County, NJ. It probably came from the Navesink formation (Cretaceous, Masstrichtian stage)which lines the banks of the creek.