1. Species Ennea (Gulella) acutidens O. Boettger, 1905 accepted as Digulella acutidens (O. Boettger, 1905) (unaccepted > superseded combination)
2. Species Ennea (Gulella) anceyi G. Nevill, 1890 accepted as Ptychotrema anceyi (G. Nevill, 1890) (original combination)
3. Species Ennea (Gulella) babaulti Germain, 1919 accepted as Gulella babaulti (Germain, 1919) accepted as Gulella woodhousei (Preston, 1913) accepted as Gulella landianiensis woodhousei (Preston, 1913) (original combination)
4. Species Ennea (Gulella) cadmani Preston, 1916 accepted as Gulella cadmani (Preston, 1916) (basionym)
5. Species Ennea (Gulella) cavidens E. von Martens, 1876 accepted as Digulella cavidens (E. von Martens, 1876) (unaccepted > superseded combination)
6. Species Ennea (Gulella) clavulata (Lamarck, 1822) accepted as Microstrophia clavulata (Lamarck, 1822) (unaccepted > superseded combination)
7. Species Ennea (Gulella) coarctata d'Ailly, 1910 accepted as Gulella coarctata (d'Ailly, 1910) (basionym)
8. Species Ennea (Gulella) conospira E. von Martens, 1892 accepted as Conogulella conospira (E. von Martens, 1892) accepted as Gulella conospira (E. von Martens, 1892) (unaccepted > superseded combination)
9. Species Ennea (Gulella) conradti E. von Martens, 1895 accepted as Gulella conradti (E. von Martens, 1895) (basionym)
10. Species Ennea (Gulella) cristata Kobelt, 1910 accepted as Gulella cruciata (E. von Martens, 1900) (invalid: in error for Ennea cruciata E. von Martens, 1900)
11. Species Ennea (Gulella) foliifera E. von Martens, 1895 accepted as Gulella foliifera (E. von Martens, 1895) accepted as Primigulella foliifera (E. von Martens, 1895) (basionym)
12. Species Ennea (Gulella) fortidentata E. A. Smith, 1890 accepted as Gulella fortidentata (E. A. Smith, 1890) (unaccepted > superseded combination)
13. Species Ennea (Gulella) girardi Kobelt, 1904 accepted as Gulella girardi (Kobelt, 1904) (original combination)
14. Species Ennea (Gulella) hidalgoi Girard, 1894 accepted as Gulella girardi (Kobelt, 1904) (Invalid: not Möllendorff, 1888; Ennea girardi is a replacement name)
15. Species Ennea (Gulella) insularis Girard, 1894 accepted as Gulella insularis (Girard, 1894) (basionym)
16. Species Ennea (Gulella) laevigata Dohrn, 1865 accepted as Gulella laevigata (Dohrn, 1865) (unaccepted > superseded combination)
17. Species Ennea (Gulella) linguifera E. von Martens, 1895 accepted as Primigulella linguifera (E. von Martens, 1895) (original combination)
18. Species Ennea (Gulella) lobidens Thiele, 1911 accepted as Primigulella lobidens (Thiele, 1911) (original combination)
19. Species Ennea (Gulella) meruensis d'Ailly, 1910 accepted as Gulella meruensis (d'Ailly, 1910) (unaccepted > superseded combination, basionym)
20. Species Ennea (Gulella) modesta H. Adams, 1867 accepted as Microstrophia modesta (H. Adams, 1867) (basionym)
21. Species Ennea (Gulella) noltei O. Boettger, 1898 accepted as Gulella noltei (O. Boettger, 1898) (original combination)
22. Species Ennea (Gulella) pallaryi Preston, 1909 accepted as Gulella vriesiana (Ancey, 1885) accepted as Digulella vriesiana (Ancey, 1885) (junior synonym)
23. Species Ennea (Gulella) sexdentata E. von Martens, 1869 accepted as Gulella sexdentata (E. von Martens, 1869) (unaccepted > superseded combination)
24. Species Ennea (Gulella) subhyalina E. A. Smith, 1890 accepted as Gulella subhyalina (E. A. Smith, 1890) (unaccepted > superseded combination)
25. Species Ennea (Gulella) triplicina E. von Martens, 1895 accepted as Gulella triplicina (E. von Martens, 1895) (basionym)
26. Species Ennea (Gulella) ugandensis E. A. Smith, 1901 accepted as Gulella ugandensis (E. A. Smith, 1901) (basionym)
27. Species Ennea (Gulella) varians E. A. Smith, 1899 accepted as Gulella varians (E. A. Smith, 1899) (basionym)
28. Species Ennea (Gulella) vicina E. A. Smith, 1899 accepted as Gulella vicina (E. A. Smith, 1899) (original combination)
29. Species Ennea (Gulella) quinquedentata C. Boettger, 1913 represented as Ennea quinquedentata C. Boettger, 1913 accepted as Gulella planidens (E. von Martens, 1892) (basionym)

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