Brachyopterus is a genus of prehistoric eurypterid of the family Rhenopteridae. It is one of the earliest known eurypterids, having been recovered from Middle Ordovician deposits in Montgomeryshire, Wales. Though other species have been assigned to it in the past, Brachyopterus is today recognized as containing one valid species, B. stubblefieldi.
Grossopterus is a genus of prehistoric eurypterid classified as part of the family Waeringopteridae. The genus contains two species, G. inexpectans from Gilboa, United States and G. overathi from Overath, Germany.
Drepanopterus is an extinct genus of eurypterid and the only member of the family Drepanopteridae within the Mycteropoidea superfamily. There are currently three species assigned to the genus. The genus has historically included more species, with nine species having been associated with the genus Drepanopterus. Five of these have since been proven to be synonyms of pre-existing species, assigned to their own genera, or found to be based on insubstantial fossil data. The holotype of one species proved to be a lithic clast.
Moselopterus is a genus of prehistoric eurypterid from the Devonian period in Europe. The genus contains three species, M. ancylotelson and M. elongatus from Germany and M. lancmani from Latvia.
Waeringopterus is a genus of prehistoric eurypterids from the Silurian of North America. The genus contains two species, W. apfeli from the Syracuse and Vernon Formations of New York and Ontario and W. cumberlandicus from the Wills Creek Formation, West Virginia. Fossils of the genus also were found in the Indian Point Formation of Quebec.
Kokomopterus is a genus of prehistoric eurypterid. The genus contains a single species, Kokomopterus longicaudatus, known from the Silurian of Kokomo, Indiana.
Stylonurella is a genus of prehistoric eurypterid. It is classified within the Parastylonuridae family and contains three species, S. arnoldi and S. beecheri from the Devonian of Pennsylvania, United States and S. spinipes from the Silurian of Kip Burn, Scotland.
Stylonuroides is a genus of prehistoric eurypterid. The genus is classified as a stylonurine but more precise classification has proven difficult, with the genus remaining classified as incertae sedis within the suborder. The genus contains two species, S. dolichopteroides from the Silurian of Ringerike, Norway and S. orientalis from the Devonian of Lake Shunet, Southern Siberia.
Ruedemannipterus is a genus of prehistoric eurypterid classified as part of the family Dolichopteridae. The genus contains one species, R. stylonuroides, known from the Silurian of New York.
Lamontopterus is a genus of prehistoric eurypterid classified within the family Kokomopteridae. It contains one species, Lamontopterus knoxae, from the Early Silurian of Scotland.
Mycterops is a genus of prehistoric eurypterid of the family Mycteroptidae. Mycterops lived during the Carboniferous period in Europe and North America.
Laurieipterus is a genus of a eurypterid classified as part of the family Stylonuridae. It contains one species, L. elegans from the Early Silurian of Scotland.
Eurypteroidea are an extinct superfamily of eurypterids. It contains three families and two genera of uncertain classification, Paraeurypterus and Pentlandopterus.
Diploperculata is an infraorder of eurypterids, an extinct group of aquatic arthropods commonly known as "sea scorpions". The name, derived from Greek διπλόω ("double") and operculum, refers to the distinguishing feature that unites the superfamilies included in the group, that the genital operculum is made up of two fused segments.
Onychopterellidae are an extinct family of eurypterids. The family is the only family classified as part of the superfamily Onychopterelloidea. Genera included are Alkenopterus, Onychopterella and Tylopterella.
Stoermeropterus is a genus of prehistoric eurypterid from the Silurian period in Europe and North America classified as part of the Moselopteridae family. The genus contains three species, S. conicus and S. latus from Ringerike, Norway and S. nodosus from West Virginia.
Vinetopterus is a genus of prehistoric eurypterid from the Devonian period in Europe classified as part of the Moselopteridae family. The genus contains two species, both from Germany: V. struvei and V. martini.
Paraeurypterus is a genus of prehistoric eurypterid from the Late Ordovician period. The genus contains one species, P. anatoliensis, known from Şort Tepe in Turkey. Classified as part of the Eurypteroidea superfamily, it has not yet been possible to classify it as part of any particular family.
Pentlandopterus is a genus of prehistoric eurypterid from the Late Ordovician period. The genus contains one species, P. minor, known from the Pentland Hills in Scotland. Classified as part of the Eurypteroidea superfamily, it has not yet been possible to classify it as part of any particular family.
Marsupipterus is a genus of prehistoric eurypterid with an uncertain classification. The genus contains one species, M. sculpturatus, from the Silurian of England.
