1. Species Eucalanus bungii Giesbrecht, 1893
2. Species Eucalanus californicus Johnson M.W., 1938
3. Species Eucalanus hyalinus (Claus, 1866)
4. Species Eucalanus inermis Giesbrecht, 1893
5. Species Eucalanus muticus Wilson C.B., 1950
6. Species Eucalanus acus Farran, 1929 accepted as Eucalanus longiceps Matthews, 1925 accepted as Subeucalanus longiceps (Matthews, 1925)
7. Species Eucalanus atlanticus Wolfenden, 1904 accepted as Eucalanus elongatus (Dana, 1848) represented as Eucalanus elongatus elongatus (Dana, 1848)
8. Species Eucalanus attenuatus (Dana, 1849) accepted as Pareucalanus attenuatus (Dana, 1849)
9. Species Eucalanus cornutus Sars G.O., 1912 accepted as Rhincalanus cornutus (Dana, 1849) represented as Rhincalanus cornutus cornutus (Dana, 1849) (Cited only once, at several stations in the North Atlantic (p. 654), without doubt for Rhincalanus cornutus)
10. Species Eucalanus crassus Giesbrecht, 1888 accepted as Subeucalanus crassus (Giesbrecht, 1888)
11. Species Eucalanus dentatus Scott A., 1909 accepted as Subeucalanus dentatus (Scott A., 1909)
12. Species Eucalanus giesbrechti Mori, 1937 accepted as Eucalanus elongatus (Dana, 1848) represented as Eucalanus elongatus elongatus (Dana, 1848)
13. Species Eucalanus langae Fleminger, 1973 accepted as Pareucalanus langae (Fleminger, 1973)
14. Species Eucalanus longiceps Matthews, 1925 accepted as Subeucalanus longiceps (Matthews, 1925) (synonimized)
15. Species Eucalanus mastigophorus (Claus, 1866) accepted as Clausocalanus arcuicornis (Dana, 1849) represented as Clausocalanus arcuicornis arcuicornis (Dana, 1849)
16. Species Eucalanus mediterraneus (Claus, 1863) accepted as Pareucalanus attenuatus (Dana, 1849) (listed as synonym by Vives & Shmeleva, 2007)
17. Species Eucalanus monachus Giesbrecht, 1888 accepted as Subeucalanus monachus (Giesbrecht, 1888)
18. Species Eucalanus mucronatus Giesbrecht, 1888 accepted as Subeucalanus mucronatus (Giesbrecht, 1888)
19. Species Eucalanus nasutus Sars G.O., 1912 accepted as Rhincalanus nasutus Giesbrecht, 1888 (listed as synonym by Vives & Shmeleva, 2007)
20. Species Eucalanus oculanus Marukawa, 1921 accepted as Eucalanus crassus Giesbrecht, 1888 accepted as Subeucalanus crassus (Giesbrecht, 1888)
21. Species Eucalanus parki Fleminger, 1973 accepted as Pareucalanus parki (Fleminger, 1973)
22. Species Eucalanus peruanus Volkov, 1971 accepted as Pareucalanus peruanus (Volkov, 1971)
23. Species Eucalanus pileatus Giesbrecht, 1888 accepted as Subeucalanus pileatus (Giesbrecht, 1888)
24. Species Eucalanus pseudattenuatus Sewell, 1947 accepted as Eucalanus attenuatus (Dana, 1849) accepted as Pareucalanus attenuatus (Dana, 1849)
25. Species Eucalanus quadrisetosus Geletin, 1973 accepted as Pareucalanus parki (Fleminger, 1973)
26. Species Eucalanus saravatae Oliveira, 1945 accepted as Subeucalanus pileatus (Giesbrecht, 1888)
27. Species Eucalanus sewelli Fleminger, 1973 accepted as Pareucalanus sewelli (Fleminger, 1973)
28. Species Eucalanus spinifer Scott T., 1894 accepted as Eucalanus elongatus (Dana, 1848) represented as Eucalanus elongatus elongatus (Dana, 1848)
29. Species Eucalanus subcrassus Giesbrecht, 1888 accepted as Subeucalanus subcrassus (Giesbrecht, 1888)
30. Species Eucalanus subtenuis Giesbrecht, 1888 accepted as Subeucalanus subtenuis (Giesbrecht, 1888)
31. Species Eucalanus vadicola Dahl F., 1894 accepted as Subeucalanus monachus (Giesbrecht, 1888)
32. Species Eucalanus elongatus (Dana, 1848) represented as Eucalanus elongatus elongatus (Dana, 1848)
33. Species Eucalanus danai (Lubbock, 1860) (uncertain > taxon inquirendum, according to Giesbrecht, 1893)
34. Species Eucalanus setiger Brady, 1883 (uncertain > taxon inquirendum, according to Giesbrecht, 1893)

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