Copepoda name details
Eucyclops vandouwei (Brehm, 1909)
351783 (urn:lsid:marinespecies.org:taxname:351783)
alternative representation
Species
Eucyclops fragilis (Kiefer, 1926) · alternative representation
Brehm, V. (1909). Zur Kenntnis der Copepodenfauna von Deutsch-Kamerun. Zoologischer Anzeiger 34(26):799-800, figs. 1-3. (21-ix-1909) [details] 
(of Cyclops vandouwii Brehm, 1909) Brehm, V. (1909). Zur Kenntnis der Copepodenfauna von Deutsch-Kamerun. Zoologischer Anzeiger 34(26):799-800, figs. 1-3. (21-ix-1909) [details]
(of Cyclops vandouwii Brehm, 1909) Brehm, V. (1909). Zur Kenntnis der Copepodenfauna von Deutsch-Kamerun. Zoologischer Anzeiger 34(26):799-800, figs. 1-3. (21-ix-1909) [details]
Taxonomic remark The correct spelling of the species name is “vandouwii”.
Brehm dedicated the species to C. van Douwe and originally...
Brehm dedicated the species to C. van Douwe and originally...
Taxonomic remark The correct spelling of the species name is “vandouwii”.
Brehm dedicated the species to C. van Douwe and originally named it as “Cyclops van douwii”.
Article 32.2 of the ICZN says that the original spelling of a name is the "correct original spelling", unless it is demonstrably incorrect as provided in Article 32.5.
A subsequent spelling is a justified emendation only if it refers to incorrect original spelling as listed in Article 32.5 of the ICZN (e.g., clear evidence of an inadvertent error, such as a lapsus calami or a copyist's or printer's error; or if a name was originally published with a diacritic or other mark, ligature, apostrophe, or hyphen, or a species-group name published as separate words). Incorrect transliteration or latinization, or use of an inappropriate connecting vowel, are not to be considered inadvertent errors.
“van douwii” vs. “vandouwii”
According to Article 32.5.2.4. of the ICZN, in compound species-group name (“van douwii” here) of which the first part consists of an abbreviation in Latin letters, or a Latin letter or a number of Latin letters qualifying the second part, whether or not separated by punctuation or a hyphen, the parts are to be united …”.
“vandouwii” vs. “vandouwei”
Species group names can be formed from personal name that is Latin, or modern personal name that is latinized, or directly from a modern personal name (see Articles 31.1.1. and 31.1.2. of the ICZN).
In the original description, there is no detailed explanation of the formation of the species name. Brehm may have used the latinized name, “Douwius”, as stem in genitive case, in which case the correct ending according to Latin grammar is “ii”. The ending in -ii in “vandouwii” is correct original spelling.
As a consequence, the subsequent spelling such as “vandouwei”, although correctly formed from the modern personal name (Douwe), is an unjustified emendation (demonstrably intentional change, see Article 33.2 of the ICZN) or an incorrect subsequent spelling (Article 33.3 of the ICZN). [Comment from Maria Holynska] [details]
Brehm dedicated the species to C. van Douwe and originally named it as “Cyclops van douwii”.
Article 32.2 of the ICZN says that the original spelling of a name is the "correct original spelling", unless it is demonstrably incorrect as provided in Article 32.5.
A subsequent spelling is a justified emendation only if it refers to incorrect original spelling as listed in Article 32.5 of the ICZN (e.g., clear evidence of an inadvertent error, such as a lapsus calami or a copyist's or printer's error; or if a name was originally published with a diacritic or other mark, ligature, apostrophe, or hyphen, or a species-group name published as separate words). Incorrect transliteration or latinization, or use of an inappropriate connecting vowel, are not to be considered inadvertent errors.
“van douwii” vs. “vandouwii”
According to Article 32.5.2.4. of the ICZN, in compound species-group name (“van douwii” here) of which the first part consists of an abbreviation in Latin letters, or a Latin letter or a number of Latin letters qualifying the second part, whether or not separated by punctuation or a hyphen, the parts are to be united …”.
“vandouwii” vs. “vandouwei”
Species group names can be formed from personal name that is Latin, or modern personal name that is latinized, or directly from a modern personal name (see Articles 31.1.1. and 31.1.2. of the ICZN).
In the original description, there is no detailed explanation of the formation of the species name. Brehm may have used the latinized name, “Douwius”, as stem in genitive case, in which case the correct ending according to Latin grammar is “ii”. The ending in -ii in “vandouwii” is correct original spelling.
As a consequence, the subsequent spelling such as “vandouwei”, although correctly formed from the modern personal name (Douwe), is an unjustified emendation (demonstrably intentional change, see Article 33.2 of the ICZN) or an incorrect subsequent spelling (Article 33.3 of the ICZN). [Comment from Maria Holynska] [details]
Walter, T.C.; Boxshall, G. (2025). World of Copepods Database. Eucyclops vandouwei (Brehm, 1909). Accessed at: https://marinespecies.org/copepoda/aphia.php?p=taxdetails&id=351783 on 2026-08-28
original description
Brehm, V. (1909). Zur Kenntnis der Copepodenfauna von Deutsch-Kamerun. Zoologischer Anzeiger 34(26):799-800, figs. 1-3. (21-ix-1909) [details]
original description (of Cyclops vandouwii Brehm, 1909) Brehm, V. (1909). Zur Kenntnis der Copepodenfauna von Deutsch-Kamerun. Zoologischer Anzeiger 34(26):799-800, figs. 1-3. (21-ix-1909) [details]
additional source Alekseev, V.R. (2024). Genera Eucyclops Claus, 1893, Isocyclops Kiefer, 1957 and Stygocyclops Pleša, 1971 (Copepoda: Cyclopoida) Identification guide of the world fauna. <em>In: Dumont, H.J.F. (ed.). Identification guides to the plankton and benthos of inland waters. Arthropoda Selecta Supplement No. 6, KMK Scientific Press, Moscow.</em> 28:1-201. [details] Available for editors
[request]
additional source Dumont, H.J. (1979). Limnologie van Sahara en Sahel: bijdrage tot een beter begrip van de klimaatsveranderingen van het laat-Pleistoceen en Holoceen. [Limnology of the Sahara and Sahel: contribution to a better understanding of the climate changes of the late Pleistocene and Holocene.]. <em>Rijksuniversiteit Gent, Faculteit der Wetenschappen.</em> 557 pp.
page(s): 282 [details] Available for editors [request]
additional source Kiefer, F. (1928). Crustacea I. Copepoda aquae dulcis. [Crustacea I. Copepoda of fresh water. <em>In: Gruvel, A. (ed.). Faune des colonies françaises. Tome 1. publiée sous la direction de A. Gruvel, Contribution à l'étude de la faune du Cameroun.</em> 1:535-570, figs. 1-48. [details] Available for editors [request]
additional source Lindberg, K. (1958). Un Cyclopide (Crustacé Copépode) récolté par Monsieur Patrice Paulian dans l'île Amsterdam. Revue de la synonymie et de la répartition géographique des espèces du genre Paracyclops (C. Claus 1893). [A Cyclopid (Copepod Crustacean) collected by Mr. Patrice Paulian on Amsterdam Island. Review of the synonymy and geographical distribution of species of the genus Paracyclops (C. Claus 1893).]. <em>Arkiv för Zoologi.</em> n. ser. 11(20): 355-377, figs. 1-2. (14-iii-1958). [details] Available for editors [request]
original description (of Cyclops vandouwii Brehm, 1909) Brehm, V. (1909). Zur Kenntnis der Copepodenfauna von Deutsch-Kamerun. Zoologischer Anzeiger 34(26):799-800, figs. 1-3. (21-ix-1909) [details]
additional source Alekseev, V.R. (2024). Genera Eucyclops Claus, 1893, Isocyclops Kiefer, 1957 and Stygocyclops Pleša, 1971 (Copepoda: Cyclopoida) Identification guide of the world fauna. <em>In: Dumont, H.J.F. (ed.). Identification guides to the plankton and benthos of inland waters. Arthropoda Selecta Supplement No. 6, KMK Scientific Press, Moscow.</em> 28:1-201. [details] Available for editors
[request]additional source Dumont, H.J. (1979). Limnologie van Sahara en Sahel: bijdrage tot een beter begrip van de klimaatsveranderingen van het laat-Pleistoceen en Holoceen. [Limnology of the Sahara and Sahel: contribution to a better understanding of the climate changes of the late Pleistocene and Holocene.]. <em>Rijksuniversiteit Gent, Faculteit der Wetenschappen.</em> 557 pp.
page(s): 282 [details] Available for editors
[request]additional source Kiefer, F. (1928). Crustacea I. Copepoda aquae dulcis. [Crustacea I. Copepoda of fresh water. <em>In: Gruvel, A. (ed.). Faune des colonies françaises. Tome 1. publiée sous la direction de A. Gruvel, Contribution à l'étude de la faune du Cameroun.</em> 1:535-570, figs. 1-48. [details] Available for editors
[request]additional source Lindberg, K. (1958). Un Cyclopide (Crustacé Copépode) récolté par Monsieur Patrice Paulian dans l'île Amsterdam. Revue de la synonymie et de la répartition géographique des espèces du genre Paracyclops (C. Claus 1893). [A Cyclopid (Copepod Crustacean) collected by Mr. Patrice Paulian on Amsterdam Island. Review of the synonymy and geographical distribution of species of the genus Paracyclops (C. Claus 1893).]. <em>Arkiv för Zoologi.</em> n. ser. 11(20): 355-377, figs. 1-2. (14-iii-1958). [details] Available for editors
[request]From editor or global species database
Taxonomic remark The correct spelling of the species name is “vandouwii”.Brehm dedicated the species to C. van Douwe and originally named it as “Cyclops van douwii”.
Article 32.2 of the ICZN says that the original spelling of a name is the "correct original spelling", unless it is demonstrably incorrect as provided in Article 32.5.
A subsequent spelling is a justified emendation only if it refers to incorrect original spelling as listed in Article 32.5 of the ICZN (e.g., clear evidence of an inadvertent error, such as a lapsus calami or a copyist's or printer's error; or if a name was originally published with a diacritic or other mark, ligature, apostrophe, or hyphen, or a species-group name published as separate words). Incorrect transliteration or latinization, or use of an inappropriate connecting vowel, are not to be considered inadvertent errors.
“van douwii” vs. “vandouwii”
According to Article 32.5.2.4. of the ICZN, in compound species-group name (“van douwii” here) of which the first part consists of an abbreviation in Latin letters, or a Latin letter or a number of Latin letters qualifying the second part, whether or not separated by punctuation or a hyphen, the parts are to be united …”.
“vandouwii” vs. “vandouwei”
Species group names can be formed from personal name that is Latin, or modern personal name that is latinized, or directly from a modern personal name (see Articles 31.1.1. and 31.1.2. of the ICZN).
In the original description, there is no detailed explanation of the formation of the species name. Brehm may have used the latinized name, “Douwius”, as stem in genitive case, in which case the correct ending according to Latin grammar is “ii”. The ending in -ii in “vandouwii” is correct original spelling.
As a consequence, the subsequent spelling such as “vandouwei”, although correctly formed from the modern personal name (Douwe), is an unjustified emendation (demonstrably intentional change, see Article 33.2 of the ICZN) or an incorrect subsequent spelling (Article 33.3 of the ICZN). [Comment from Maria Holynska] [details]