• Leionucula Quenstedt, 1930 †
• Leionucula aegeensis (Forbes, 1844) accepted as Ennucula aegeensis (Forbes, 1844)
• Leionucula albensis (A. d'Orbigny, 1844) †
• Leionucula bellotii (A. Adams, 1856) accepted as Ennucula tenuis (Montagu, 1808)
• Leionucula burdigalica (Cossmann & Peyrot, 1912) †
• Leionucula cecileana (A. d'Orbigny, 1843) †
• Leionucula devjatilovae (Kafanov, Ogasawara & Marincovich, 2001) †
• Leionucula frigida (Anelli, Rocha-Campus, dos Santos, Perinotto & Quaglio, 2006) †
• Leionucula gabbi (Stanton, 1895) †
• Leionucula haesendoncki (Nyst & Westendorp, 1839) †
• Leionucula hanseata (Kautsky, 1925) † accepted as Leionucula ryckholtiana (Nyst, 1843) †
• Leionucula hunickeni (Zinsmeister & Macellari, 1988) †
• Leionucula inflata (Hancock, 1846) accepted as Ennucula tenuis (Montagu, 1808)
• Leionucula inflata inflata (Hancock, 1846) accepted as Ennucula tenuis (Montagu, 1808)
• Leionucula inflata romboides Scarlato, 1981 accepted as Ennucula romboides (Scarlato, 1981)
• Leionucula laevigata (J. Sowerby, 1818) †
• Leionucula laevigata laevigata (J. Sowerby, 1818) † accepted as Leionucula laevigata (J. Sowerby, 1818) †
• Leionucula lebuensis (R. A. Philippi, 1887) †
• Leionucula musculosa (Anelli, Rocha-Campus, dos Santos, Perinotto & Quaglio, 2006) †
• Leionucula niponica (E. A. Smith, 1885) accepted as Ennucula niponica (E. A. Smith, 1885)
• Leionucula nova (Wilckens, 1910) †
• Leionucula ovatotruncata Scarlato, 1980 accepted as Ennucula tenuis (Montagu, 1808)
• Leionucula palaioanaxea Stilwell, 1993 †
• Leionucula palmeri (Zinsmeister, 1984) †
• Leionucula peregrina (Deshayes, 1858) †
• Leionucula ryckholtiana (Nyst, 1843) †
• Leionucula strangei (A. Adams, 1856) accepted as Ennucula strangei (A. Adams, 1856)
• Leionucula strangeiformis (Dell, 1956) accepted as Ennucula strangeiformis (Dell, 1956)
• Leionucula subaraucana Frassinetti, 1997 †
• Leionucula sublaevigata (Dollfus & Dautzenberg, 1888) †
• Leionucula suboblonga (Wilckens, 1907) †
• Leionucula tenuis (Montagu, 1808) accepted as Ennucula tenuis (Montagu, 1808)
• Leionucula tenuis expansa (Reeve, 1855) accepted as Ennucula tenuis (Montagu, 1808)
• Leionucula tenuis tenuis (Montagu, 1808) accepted as Ennucula tenuis (Montagu, 1808)
• Nucula (Leionucula) Quenstedt, 1930 accepted as Leionucula Quenstedt, 1930 †
• Nucula (Leionucula) cecileana (A. d'Orbigny, 1843 † accepted as Leionucula cecileana (A. d'Orbigny, 1843) †
• Nucula (Leionucula) ceciliana † accepted as Nucula (Leionucula) cecileana (A. d'Orbigny, 1843 † accepted as Leionucula cecileana (A. d'Orbigny, 1843) †
• Nucula (Leionucula) devjatilovae Kafanov, Ogasawara & Marincovich, 2001 † accepted as Leionucula devjatilovae (Kafanov, Ogasawara & Marincovich, 2001) †
• Nucula (Leionucula) faba F.-S. Xu, 1999 accepted as Ennucula faba (F.-S. Xu, 1999)
• Nucula (Leionucula) hunickeni Zinsmeister & Macellari, 1988 † accepted as Leionucula hunickeni (Zinsmeister & Macellari, 1988) †
• Nucula (Leionucula) leptodonta F. R. Bernard, 1983 accepted as Ennucula tenuis (Montagu, 1808)
• Nucula (Leionucula) nova Wilckens, 1910 † accepted as Leionucula nova (Wilckens, 1910) †
• Nucula (Leionucula) palmeri Zinsmeister, 1984 † accepted as Leionucula palmeri (Zinsmeister, 1984) †
• Nucula (Leionucula) parvula Devjatilova, 1981 † accepted as Nucula (Leionucula) devjatilovae Kafanov, Ogasawara & Marincovich, 2001 † accepted as Leionucula devjatilovae (Kafanov, Ogasawara & Marincovich, 2001) †
• Nucula (Leionucula) subaraucana Frassinetti, 1997 † accepted as Leionucula subaraucana Frassinetti, 1997 †
• Nucula (Leionucula) suboblonga (Wilckens, 1907) † accepted as Leionucula suboblonga (Wilckens, 1907) †
• Nucula (Leionucula) yaquinae F. R. Bernard, 1983 accepted as Ennucula cardara (Dall, 1916)