Unio lithophagus Philippi, 1847
‘Parreyss’ Philippi, 1847. Abbild. Beschr. Conch. 3: 45.

Nodularia (s.s.) teretiuscula — Simpson (1900)
Unio teretiusculus — Pallary (1903), Pilsbry & Bequaert (1927)
Nodularia (Lanceolaria) teretiuscula var. lithophaga — Pallary (1909)
Nodularia (s.s.) teretiuscula var. lithophagus — Simpson (1914)
Unio (Nitia) teretiusculus var. pallaryi — Pallary (1924)
Nitia teretiuscula — Haas (1936), Daget (1998)
Unio willcocksi — Ibrahim et al. (1999)

Unio teretiusculus Philippi, 1847
Philippi, 1847. Abbild. Beschr. Conch. 3: 45, pl. 3, fig. 3.

Nodularia (s.s.) teretiuscula — Simpson (1900), Simpson (1914)
Unio teretiusculus — Pallary (1903), Pilsbry & Bequaert (1927)
Nodularia (Lanceolaria) teretiuscula — Pallary (1909)
Nodularia (Coelatura) teretiusculus — Kobelt (1910)
Unio (Nitia) teretiusculus — Pallary (1924)
Caelatura [sic] teretiusculus — Thiele (1934), Mandahl-Barth (1988)
Nitia teretiuscula — Haas (1936), Haas (1969), Haas (1969), Daget (1998), Graf & Cummings (2007), ... Graf & Cummings (2021), Bolotov et al. (2022), Bolotov et al. (2022), Bolotov et al. (2024), Zieritz et al. (2024)
Coelatura (Nitia) teretiuscula — Van Damme (1984)
Caelatura [sic] (Nitia) teretiuscula — Ibrahim et al. (1999)

Unio cailliaudi Martens, 1866
‘Fer.’ Martens, 1866. Malak. Blatt. 13: 13.
(intro'd as syn of Unio teretiusculus Philippi, 1847)

Unio teretiusculus — Pallary (1903), Pilsbry & Bequaert (1927)
Nitia teretiuscula — Daget (1998)

Nodularia (sec. Cafferia) jickeli Simpson, 1900
‘Phil.’ Jickeli, 1874. Nova Acta Dtsch. Akad. Naturf. 37(1): 276, pl. 11, figs. 3-3b [as ‘U. teretiusculus’]. [in part]
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 826.
Simpson, 1914. Descr. Cat. Naiades: 579 [as ‘Unio jickeli’].

Nodularia (sec. Cafferia) jickeli — Simpson (1900)
Nodularia (Lanceolaria) jickeli — Pallary (1909)
Nodularia (Cafferia) jickelii — Kobelt (1910)
Unio (sec. Cafferia) jickeli — Simpson (1914)
Unio (Nitia) fourtaui — Pallary (1924)
Unio jickeli — Pilsbry & Bequaert (1927)
Nitia teretiuscula — Haas (1936), Haas (1969), Daget (1998)
Schleschiella parallelepipedon parallelepipedon [sic] — Modell (1950)
Diplodon parallelipipedon [sic] — Simone (2006)

Unio fourtaui Pallary, 1903
‘Phil.’ Jickeli, 1874. Nova Acta Dtsch. Akad. Naturf. 37(1): 276, pl. 11, figs. 3-3b [as ‘U. teretiusculus’]. [in part]
Pallary, 1903. Bull. Inst. Égypt. 3 (4th series): 95.
Pallary, 1924. Mém. Inst. Égypte 7 (n.s.): 49.

Unio fourtaui — Pallary (1903)
Nodularia (Lanceolaria) jickeli — Pallary (1909)
Unio (sec. Cafferia) jickeli — Simpson (1914)
Unio (Nitia) fourtaui — Pallary (1924)
Unio jickeli — Pilsbry & Bequaert (1927)
Nitia teretiuscula — Haas (1936), Haas (1969), Daget (1998)
Schleschiella parallelepipedon parallelepipedon [sic] — Modell (1950)
Diplodon parallelipipedon [sic] — Simone (2006)

Nodularia teretiuscula var. pallaryi Longstaff, 1914
Longstaff, 1914. J. Linn. Soc., Zool. 32: 256, pl. 18, figs. 12-14.
(intro'd as intra-sp. of Unio teretiusculus Philippi, 1847)
Type(s): HOLOTYPE BMNH_1923-6-8-1219, near Mogran, S. Sudan.

Unio (Nitia) teretiusculus var. pallaryi — Pallary (1924)
— Pilsbry & Bequaert (1927)
Nitia teretiuscula — Haas (1936), Haas (1969), Daget (1998), Graf & Cummings (2011)

Unio (Nitia) teretiusculus var. minor Pallary, 1924
Pallary, 1924. Mém. Inst. Égypte 7 (n.s.): 49.
(homonym of Unio margaritifer var. minor Rossmässler, 1835)

Unio (Nitia) teretiusculus var. minor — Pallary (1924)

Margarita (Unio) cailliaudii Lea, 1836
‘Fer.’ Lea, 1836. Synopsis Fam. Naiades: ??. [nomen nudum]
‘Fer.’ Lea, 1838. Synopsis Fam. Naiades: 24. [nomen nudum]
‘Fer.’ Lea, 1852. Synopsis Fam. Naiades: 36. [nomen nudum]
‘Fer.’ Lea, 1870. Synopsis Fam. Naiades: 58.

Nodularia (s.s.) teretiuscula — Simpson (1900), Simpson (1914)
Unio teretiusculus — Pilsbry & Bequaert (1927)
Nitia teretiuscula — Haas (1936), Haas (1969), Daget (1998)

Unio teretiusculus Jickeli, 1874
‘Phil.’ Jickeli, 1874. Nova Acta Dtsch. Akad. Naturf. 37(1): 276, pl. 11, figs. 3-3b. [in part]
(reference to Unio teretiusculus Philippi, 1847)

Nodularia (sec. Cafferia) jickeli — Simpson (1900)
Unio fourtaui — Pallary (1903)
Nodularia (Lanceolaria) jickeli — Pallary (1909)
Unio (sec. Cafferia) jickeli — Simpson (1914)
Unio jickeli — Pilsbry & Bequaert (1927)
Schleschiella parallelepipedon parallelepipedon [sic] — Modell (1950)
Nitia teretiuscula — Daget (1998)
Diplodon parallelipipedon [sic] — Simone (2006)

Unio teresciusculus Van Damme & Pickford, 2010
‘Philippi’ Van Damme & Pickford, 2010. Geo-Pal Uganda 2: 48.
(error for Unio teretiusculus Philippi, 1847)