WoRMS name details
Euthemisto Bovallius, 1887
101795 (urn:lsid:marinespecies.org:taxname:101795)
unaccepted
Genus
Themisto gaudichaudii Guérin, 1825 (type by typification of replaced name)
- Species Euthemisto australis Stebbing, 1888 accepted as Themisto australis (Stebbing, 1888)
- Species Euthemisto bispinosa (Boeck, 1871) accepted as Themisto gaudichaudi Guérin, 1825 accepted as Themisto gaudichaudii Guérin, 1825 (This is not a valid namestring, it appears in the European Register of Marine Species guide and is not recorded elsewhere in the taxonomic literature. It is presumed that the authors intended to include the correct name Themisto bispinosa Boeck, 1871)
- Species Euthemisto compressa (Goës, 1866) accepted as Themisto compressa Goës, 1866 (superseded recombination)
- Species Euthemisto gaudichaudii (Guérin, 1825) accepted as Themisto gaudichaudii Guérin, 1825 (unaccepted > superseded combination)
- Species Euthemisto libellula (Lichtenstein in Mandt, 1822) accepted as Themisto libellula (Lichtenstein in Mandt, 1822) (unaccepted > superseded combination)
- Species Euthemisto nordenskioldi Bovallius, 1887 accepted as Themisto libellula (Lichtenstein in Mandt, 1822) (unaccepted > junior subjective synonym)
- Species Euthemisto thomsoni Stebbing, 1888 accepted as Themisto gaudichaudi Guérin, 1825 accepted as Themisto gaudichaudii Guérin, 1825
marine, brackish, fresh, terrestrial
recent only
Bovallius, C. (1887). Systematical list of the Amphipoda Hyperiidea. <em>Kungliga Svenska Vetenskapsakademiens Handlingar.</em> 11(16): 1-50., available online at https://www.biodiversitylibrary.org/page/14184578 [details] 
Taxonomic remark The amphipod genus Themisto Guerin-Meneville, 1825, was replaced with Euthemisto by Bovallius (1887) because it was a...
Taxonomic remark The amphipod genus Themisto Guerin-Meneville, 1825, was replaced with Euthemisto by Bovallius (1887) because it was a junior homonym of the nudibranch Themisto Oken (1815). Parathemisto Boeck (1870) and Themisto Guerin-Meneville were combined under Themisto by Stephensen (1924), corrected by Barnard (1930) to Parathemisto, the name currently used by most zoologists. Volume 3 of Okens Lehrbuch der Naturgeschichte (1815) was placed, however, on the Official List of Rejected Works by Opinion 417 of the International Commission of Zoological Nomenclature (1956), which ruled that no name published in Oken's volume 3 acquired the status of availability by reason of having been so published. Consequently the name Themisto, first made available by Guerin-Meneville and a senior synonym of Parathemisto, is the valid name of the amphipod genus. [details]
Horton, T.; Lowry, J.; De Broyer, C.; Bellan-Santini, D.; Copilas-Ciocianu, D.; Corbari, L.; Costello, M.J.; Daneliya, M.; Dauvin, J.-C.; Fišer, C.; Gasca, R.; Grabowski, M.; Guerra-García, J.M.; Hendrycks, E.; Hughes, L.; Jaume, D.; Jazdzewski, K.; Kim, Y.-H.; King, R.; Krapp-Schickel, T.; LeCroy, S.; Lörz, A.-N.; Mamos, T.; Senna, A.R.; Serejo, C.; Souza-Filho, J.F.; Tandberg, A.H.; Thomas, J.D.; Thurston, M.; Vader, W.; Väinölä, R.; Valls Domedel, G.; Vonk, R.; White, K.; Zeidler, W. (2026). World Amphipoda Database. Euthemisto Bovallius, 1887. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=101795 on 2026-04-24
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Nomenclature
original description
Bovallius, C. (1887). Systematical list of the Amphipoda Hyperiidea. <em>Kungliga Svenska Vetenskapsakademiens Handlingar.</em> 11(16): 1-50., available online at https://www.biodiversitylibrary.org/page/14184578 [details]
replacement name source Bovallius, C. (1887). Systematical list of the Amphipoda Hyperiidea. <em>Kungliga Svenska Vetenskapsakademiens Handlingar.</em> 11(16): 1-50., available online at https://www.biodiversitylibrary.org/page/14184578
page(s): 21 [details]
replacement name source Bovallius, C. (1887). Systematical list of the Amphipoda Hyperiidea. <em>Kungliga Svenska Vetenskapsakademiens Handlingar.</em> 11(16): 1-50., available online at https://www.biodiversitylibrary.org/page/14184578
page(s): 21 [details]
Taxonomy
taxonomy source
Zeidler, W. (2004). A review of the families and genera of the hyperiidean amphipod superfamily Phronimoidea Bowman & Gruner, 1973 (Crustacea: Amphipoda: Hyperiidea). <em>Zootaxa.</em> 567: 1-66., available online at http://www.mapress.com/zootaxa/2004f/z00567f.pdf [details] Available for editors 
[request]
status source Evans, F. (1968). The subgenera Parathemisto and Euthemisto of the genus Parathemisto (Amphipoda, Hyperiidea). <em>Crustaceana.</em> 14(1): 105-106., available online at https://doi.org/10.1163/156854068x01213 [details] Available for editors [request]
[request]status source Evans, F. (1968). The subgenera Parathemisto and Euthemisto of the genus Parathemisto (Amphipoda, Hyperiidea). <em>Crustaceana.</em> 14(1): 105-106., available online at https://doi.org/10.1163/156854068x01213 [details] Available for editors
[request]Other
additional source
Bowman, T. E. (1960). The pelagic Amphipod genus Parathemisto (Hyperiidea: Hyperiidae) in the North Pacific and adjacent Arctic Ocean. <em>Proceedings of the United States National Museum.</em> 112(3439): 343-392., available online at https://www.biodiversitylibrary.org/page/7717169 [details] Available for editors [request]
additional source Neave, S.A. (1939 - 1996). Nomenclator Zoologicus. vol. 1-10 Online., available online at https://www.checklistbank.org/dataset/126539/about [details]
[request]additional source Neave, S.A. (1939 - 1996). Nomenclator Zoologicus. vol. 1-10 Online., available online at https://www.checklistbank.org/dataset/126539/about [details]
Present Inaccurate Introduced: alien Containing type locality
Unknown type, verbatimGeounit south west of Melbou... [details]
From editor or global species database
Taxonomic remark The amphipod genus Themisto Guerin-Meneville, 1825, was replaced with Euthemisto by Bovallius (1887) because it was a junior homonym of the nudibranch Themisto Oken (1815). Parathemisto Boeck (1870) and Themisto Guerin-Meneville were combined under Themisto by Stephensen (1924), corrected by Barnard (1930) to Parathemisto, the name currently used by most zoologists. Volume 3 of Okens Lehrbuch der Naturgeschichte (1815) was placed, however, on the Official List of Rejected Works by Opinion 417 of the International Commission of Zoological Nomenclature (1956), which ruled that no name published in Oken's volume 3 acquired the status of availability by reason of having been so published. Consequently the name Themisto, first made available by Guerin-Meneville and a senior synonym of Parathemisto, is the valid name of the amphipod genus. [details]
From editor or global species database
Image from typetaxon
