Timeline of eurypterid research

This timeline of eurypterid research is a chronologically ordered list of important fossil discoveries, controversies of interpretation, and taxonomic revisions of eurypterids, a group of extinct aquatic arthropods closely related to modern arachnids and horseshoe crabs that lived during the Paleozoic Era.
The scientific study of eurypterids began in the early 19th century when James E. DeKay recognized a fossil that had previously been described as that of a fish as arthropod in nature. Though DeKay erroneously believed the fossil to represent a crustacean and a missing link between trilobites and branchiopods, the fossil became the type species of first ever eurypterid to be scientifically described, "Eurypterus remipes", in 1825.
Over 250 species of eurypterids in 74 recognized valid genera have been described since the discovery of "Eurypterus remipes". The most recent genus to be described is "Pruemopterus" (2020) and the most recent species to be described is "Adelophthalmus pyrrhae" (2020).
19th century.
1810s.
1818
1820s.
1825
1830s.
1831
1836
1838
1839
1840s.
1843
1844
1849
1850s.
1851
1852
1854
1855
1856
1859
1860s.
1860
1861
1865
1866
1868
1870s.
1870
1871
1872
1873
1875
1877
1879
1880s.
1881
1882
1883
1884
1888
1889
1890s.
1890
1893
1896
1898
1899
20th century.
1900s.
1901
1902
1903
1905
1907
1910s.
1911
1912
1914
1915
1916
1920s.
1920
1921
1922
1924
1926
1930s.
1933
1934
1935
1936
1938
1939
1940s.
1942
1948
1950s.
1950
1951
1952
1953
1955
1956
1957
1958
1959
1960s.
1961
1964
1966
1968
1969
1970s.
1971
1973
1974
1980s.
1980
1981
1983
1985
1986
1989
1990s.
1994
1995
21st century.
2000s.
2004
2005
2006
2007
2008
2009
2010s.
2012
2013
2015
2017
2018
2019
2020s.
2020