English Alkenopterus Cited by user Super Dromaeosaurus on 30 Sep 2019 Alkenopterus is a genus of prehistoric eurypterid classified as part of the family Onychopterellidae.
English Tylopterella Cited by user Super Dromaeosaurus on 27 Jun 2019 Tylopterella is a genus of eurypterid, a group of extinct aquatic arthropods. Only one fossil of the single and type species, T.
English Onychopterella Cited by user Super Dromaeosaurus on 29 Dec 2018 Onychopterella is a genus of predatory eurypterid, an extinct group of aquatic arthropods.