Plesiosminthus fremdi (extinct)
Found in one sample
United States: Campbell Ranch (Late Oligocene)
See also Plesiosminthus, Plesiosminthus clivosus, Plesiosminthus conjunctus, Plesiosminthus myarion, Plesiosminthus promyarion, Plesiosminthus schaubi, Plesiosminthus sp.