Obliquaria (Quadrula) bullata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 307 [also as ‘U. bullata’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 51.
(homonym of Obliquaria (Quadrula) flexuosa var. bullata Rafinesque, 1820)
Type(s): NEOTYPE ANSP_20250, Kentucky River.

— Simpson (1900), Simpson (1914), de Gregorio (1914)
Quadrula pustulosa pernodosa — Vanatta (1915)
Quadrula pustulosa — Ortmann (1918), Ortmann & Walker (1922), Burch (1975), R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008)
Quadrula (Bullata) pustulosa — Frierson (1927)
Quadrula (Pustulosa) pustulosa pustulosa — Haas (1969)
Quadrula bullata — Morrison (1969)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Obliquaria (Quadrula) retusa Rafinesque, 1820
Rafinesque, 1818. Amer. Mon. Mag. 3: 355 [as ‘Potamilus retusus’]. [nomen nudum]
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 427 [as ‘U. (Obovaria) retusa’]. [nomen nudum]
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 306, pl. 81, figs. 19-20 [also as ‘Unio retusa’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 22, 29, 50.
(renamed Unio premorsus Rafinesque, 1831)
Type(s): NEOTYPE ANSP_20220, Green River.

Obovaria retusa — Simpson (1900), Simpson (1914)
Quadrula pustulosa — Vanatta (1915), Ortmann & Walker (1922), Williams et al. (2008)
Obliquaria retusa — Burch (1975)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio verrucosa Valenciennes, 1827
Valenciennes, 1827. Receuil Observ. Zool. 2(11-12): 231, pl. 53, fig. 2.
(homonym of Unio verrucosus Barnes, 1823)

Quadrula (sec. Theliderma) pustulosa — Simpson (1900), Simpson (1914)
Quadrula (Bullata) pustulosa — Frierson (1927)
Quadrula (Pustulosa) pustulosa pustulosa — Haas (1969)
Quadrula pustulosa — Parmalee & Bogan (1998)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio premorsus Rafinesque, 1831
Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.
(new name for Obliquaria (Quadrula) retusa Rafinesque, 1820)

Pleurobema premorsa — Morrison (1969)
Quadrula pustulosa — Williams et al. (2008)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio pustulosus Lea, 1831
Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 76 [86], pl. 7, fig. 7.
Type(s): SYNTYPES ANSP_43058, Ohio.

Quadrula (sec. Theliderma) pustulosa — Simpson (1900), Simpson (1914)
Unio (s.s.) pustulosus — Call (1900)
Quadrula pustulosa — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910), Ortmann (1912), ... Jones (2015), Inoue et al. (2018), Marshall et al. (2018), Klymus et al. (2020), Gasparini et al. (2020)
Unio pustulosus — de Gregorio (1914)
Quadrula (Bullata) pustulosa — Frierson (1927)
Quadrula (s.s.) pustulosus — F.C. Baker (1928)
Quadrula (Pustulosa) pustulosa pustulosa — Haas (1969)
Quadrula bullata — Morrison (1969)
Quadrula pustulosa pustulosa — Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), Lydeard et al. (1999), Watters et al. (2009), ITIS (2012)
Amphinaias pustulosa — Graf & Cummings (2007), Cummings & Graf (2010), IUCN (2011), Roe & Boyer (2015)
Rotundaria pustulosa — Campbell & Lydeard (2012)
Cyclonaias pustulosa — Williams et al. (2017), Johnson et al. (2018), Lopes-Lima et al. (2019), Graf & Cummings (2021), Bieler (2021), FMCS (2021), Hopper et al. (2023), Freeman et al. (2025)
Pustulosa pustulosa — Neemuchwala et al. (2023)

Unio nodulosus Say, 1834
Say, 1834. Amer. Conch. 6: ??.
(misidentified reference to Mya nodulosa Wood, 1815)

Quadrula (sec. Theliderma) pustulosa — Simpson (1900), Simpson (1914)
Quadrula pustulosa — Utterback (1915), Oesch (1984), Howells et al. (1996), Parmalee & Bogan (1998), Williams et al. (2008)
Quadrula (Bullata) pustulosa — Frierson (1927)
Quadrula (Pustulosa) pustulosa pustulosa — Haas (1969)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio prasinus Conrad, 1834
Conrad, 1834. New Fresh-Water Shells: 44, pl. 3, fig.1.
Conrad, 1837. Monogr. Fam. Unionidae 1(9): 79, pl. 44, fig. 2.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 255.

Quadrula (sec. Theliderma) pustulosa — Simpson (1900), Simpson (1914)
Quadrula pustulosa prasina — Ortmann & Walker (1922)
Quadrula (Bullata) pustulosa-prasina — Frierson (1927)
Quadrula (s.s.) pustulosus prasina — F.C. Baker (1928)
Quadrula (Pustulosa) pustulosa prasina — Haas (1969)
Quadrula pustulosa — Burch (1975), Parmalee & Bogan (1998), Williams et al. (2008)
Quadrula quadrula — R.I. Johnson (1980)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio schoolcraftensis Lea, 1834
Lea, 1834. Trans. Amer. Phil. Soc. 5 [O. 1]: 37 [149], pl. 3, fig. 9.

Quadrula (sec. Theliderma) pustulosa — Simpson (1900)
Quadrula (sec. Theliderma) pustulosa var. schoolcraftensis — Simpson (1914)
Quadrula pustulosa schoolcraftensis — Utterback (1915)
Quadrula pustulosa prasina — Ortmann & Walker (1922)
Quadrula (Bullata) pustulosa-prasina — Frierson (1927)
Quadrula (s.s.) pustulosus prasina — F.C. Baker (1928)
Quadrula (Pustulosa) pustulosa prasina — Haas (1969)
Quadrula pustulosa — R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019), Bieler (2021)

Unio mortoni Conrad, 1835
Conrad, 1835. Monogr. Fam. Unionidae 1(1): 11, pl. 6, fig. 1.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 252.
Type(s): HOLOTYPE ANSP_10287A, Bayou Teche, Louisiana.

Quadrula (sec. Theliderma) mortoni — Simpson (1900), Simpson (1914)
Quadrula mortoni — Ortmann (1912), Vidrine (1993), Howells et al. (1996), Serb et al. (2003), Bogan (2010), Pfeiffer et al. (2016), Marshall et al. (2018)
Quadrula (Bullata) pustulosa-mortoni — Frierson (1927)
Quadrula (Pustulosa) pustulosa mortoni — Haas (1969)
Quadrula pustulosa mortoni — Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), ITIS (2012), Szumowski et al. (2012)
Quadrula pustulosa — Parmalee & Bogan (1998), Williams et al. (2008), Haag (2012)
Cyclonaias mortoni — Williams et al. (2017)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019), FMCS (2021)

Unio bullatus Conrad, 1838
‘Rafinesque’ of Authors.
Conrad, 1838. Monogr. Fam. Unionidae 1(10): 82, pl. 45, fig. 2.
Lapham, 1852. Trans. WI Agri. Soc. 2: 369.
Reeve, 1864. Conch. Icon. 16: pl. 12, sp. 43.
(reference to Obliquaria (Quadrula) bullata Rafinesque, 1820)

Quadrula (sec. Theliderma) pustulosa — Simpson (1900), Simpson (1914)
Quadrula (s.s.) pustulosus — F.C. Baker (1928)
Quadrula pustulosa pustulosa — Watters et al. (2009)

Unio dorfeuillianus Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: addenda [as ‘dorfuillianus’]. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 73, pl. 17, fig. 54.
(correct name for Unio dorfuillianus Lea, 1836)
Type(s): HOLOTYPE USNM_84215, Wabash River, Ind.

Quadrula (sec. Theliderma) pustulosa — Simpson (1900), Simpson (1914)
Unio (s.s.) pustulosus — Call (1900)
Quadrula (Bullata) nodulata — Frierson (1927)
Quadrula (s.s.) pustulosus — F.C. Baker (1928)
Quadrula pustulosa — Murray & Leonard (1962), Oesch (1984), Howells et al. (1996), Parmalee & Bogan (1998), Williams et al. (2008)
— Haas (1969)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio turgidus Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: 16. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 11, pl. 5, fig. 11.
Type(s): HOLOTYPE USNM_84277, near New Orleans, La.

Quadrula (sec. Theliderma) mortoni — Simpson (1900), Simpson (1914)
Quadrula (Bullata) pustulosa-mortoni — Frierson (1927)
Quadrula (Pustulosa) pustulosa mortoni — Haas (1969)
Quadrula mortoni — Vidrine (1993), Howells et al. (1996)
Quadrula pustulosa — Parmalee & Bogan (1998), Williams et al. (2008)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio nodiferus Conrad, 1841
Conrad, 1841. Proc. Acad. Nat. Sci. 1: 19.
Conrad, 1850. Jour. Acad. Nat. Sci. 1: 277, pl. 38, figs. 4, 8.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 253.
Type(s): LECTOTYPE ANSP_10285, Jackson, La.

Quadrula (sec. Theliderma) nodifera — Simpson (1900), Simpson (1914)
Quadrula (Bullata) pustulosa-mortoni — Frierson (1927)
Quadrula (Pustulosa) pustulosa mortoni — Haas (1969)
Quadrula pustulosa — Burch (1975)
Quadrula mortoni — Vidrine (1993), Howells et al. (1996)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio pernodosus Lea, 1845
Lea, 1845. Proc. Amer. Phil. Soc. 4: 163.
Lea, 1848. Trans. Amer. Phil. Soc. 10 [O. 4]: 71 [45], pl. 3, fig. 8.
Type(s): SYNTYPE USNM_84298, N.C.

Quadrula (sec. Theliderma) pustulosa var. pernodosa — Simpson (1900), Simpson (1914)
Quadrula pernodosa — Ihering (1901)
Quadrula pustulosa pernodosa — Vanatta (1915)
Quadrula pustulosa — Ortmann (1918), Ortmann & Walker (1922), Burch (1975), Parmalee & Bogan (1998), Williams et al. (2008)
Quadrula (Bullata) pustulosa-asperata — Frierson (1927)
Quadrula (Pustulosa) pustulosa pernodosa — Haas (1969)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio aureus Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 112.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 9]: 195 [17], pl. 26, fig. 264.
Type(s): HOLOTYPE USNM_84572, Texas.

Quadrula (sec. Theliderma) aurea — Simpson (1900), Simpson (1914)
Quadrula (Bullata) aureus — Frierson (1927)
Quadrula (Pustulosa) aurea — Haas (1969)
Quadrula aurea — Burch (1975), Turgeon et al. (1988), Williams et al. (1993), Howells et al. (1996), Turgeon et al. (1998), Serb et al. (2003), Bogan (2010), ITIS (2012), Szumowski et al. (2012), Haag (2012)
Amphinaias aurea — Graf & Cummings (2007), Cummings & Graf (2010)
Cyclonaias aurea — Williams et al. (2017)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019), Graf & Cummings (2021), FMCS (2021)

Unio houstonensis Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 155.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 358 [40], pl. 60, fig. 183.
Type(s): HOLOTYPE USNM_85768, Rutersville, Texas.

Quadrula (sec. Theliderma) houstonensis — Simpson (1900), Simpson (1914)
Quadrula (Bullata) houstonensis — Frierson (1927)
— Haas (1969)
Quadrula houstonensis — Turgeon et al. (1988), Williams et al. (1993), Howells et al. (1996), Turgeon et al. (1998), Bogan (2010), Breton et al. (2011), ITIS (2012), Haag (2012), Pfeiffer et al. (2016), Chase et al. (2018)
Pleurobema riddelli — Vidrine (1993)
Amphinaias houstonensis — IUCN (1996), Graf & Cummings (2007), Cummings & Graf (2010)
Cyclonaias houstonensis — Williams et al. (2017)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019), Graf & Cummings (2021), FMCS (2021)

Unio pauperculus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 39.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 99 [103], pl. 15, fig. 247.
Type(s): HOLOTYPE USNM_85763, Columbus, Miss.

Quadrula (sec. Theliderma) paupercula — Simpson (1900), Simpson (1914)
Quadrula (Bullata) pustulosa-paupercula — Frierson (1927)
Quadrula (Pustulosa) pustulosa paupercula — Haas (1969)
Quadrula asperata — Williams et al. (2008)
Cyclonaias pustulosa — Lopes-Lima et al. (2019)

Unio refulgens Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 145.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 317 [77], pl. 51, fig. 130.
Type(s): FIGURED SYNTYPE USNM_84290, Enterprise, Lauderdale Co., Miss. [Alabama].

Quadrula (sec. Theliderma) refulgens — Simpson (1900), Simpson (1914)
Quadrula refulgens — Ortmann (1912), Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), Turgeon et al. (1998), ... Bogan (2010), ITIS (2012), Szumowski et al. (2012), Haag (2012), Inoue et al. (2018)
Quadrula (Bullata) pustulosa-refulgens — Frierson (1927)
Quadrula (Pustulosa) pustulosa refulgens — Haas (1969)
Quadrula pustulosa — Burch (1975), R.I. Johnson (1980)
Amphinaias refulgens — IUCN (1996), Graf & Cummings (2007), Cummings & Graf (2010)
Rotundaria refulgens — Campbell & Lydeard (2012), Campbell & Lydeard (2012)
Cyclonaias refulgens — Williams et al. (2017)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019), Graf & Cummings (2021), FMCS (2021)
Cyclonaias (Quadrula) refulgens — Porto-Hannes et al. (2021)

Unio sphaericus Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 145 [as ‘sphæricus’].
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 319 [79], pl. 51, fig. 132 [as ‘sphæricus’].
Type(s): FIGURED SYNTYPE USNM_84271, Pearl River, Jackson, Miss.

Quadrula (sec. Theliderma) sphaerica — Simpson (1900), Simpson (1914)
Quadrula sphaerica — Ortmann (1912)
Quadrula pustulosa — Ortmann (1918), Burch (1975)
Quadrula (Bullata) pustulosa-refulgens — Frierson (1927)
— Haas (1969)
Quadrula mortoni — Vidrine (1993), Howells et al. (1996)
Cyclonaias pustulosa — Johnson et al. (2018), Lopes-Lima et al. (2019)

Unio vallatus Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 145.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 315 [75], pl. 50, fig. 128.
Type(s): HOLOTYPE (MONOTYPY) USNM_84275, Alabama R., Ala.

Quadrula (sec. Theliderma) vallata — Simpson (1900), Simpson (1914)
Quadrula (Bullata) pustulosa-vallata — Frierson (1927)
Quadrula (Pustulosa) pustulosa vallata — Haas (1969)
Quadrula pustulosa — Burch (1975)
Quadrula asperata — Williams et al. (2008)
Cyclonaias pustulosa — Lopes-Lima et al. (2019)

Unio schoolcraftii Lea, 1870
‘Lea’ of Authors.
Lea, 1870. Synopsis Fam. Naiades: 33.
B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [5].
(error for Unio schoolcraftensis Lea, 1834)

Quadrula (sec. Theliderma) pustulosa — Simpson (1900)
Quadrula (sec. Theliderma) pustulosa var. schoolcraftensis — Simpson (1914)
Quadrula (Bullata) pustulosa-prasina — Frierson (1927)
Quadrula (Pustulosa) pustulosa prasina — Haas (1969)
Quadrula pustulosa — Vidrine (1993), Parmalee & Bogan (1998), Williams et al. (2008)
Quadrula pustulosa pustulosa — Watters et al. (2009)
Cyclonaias pustulosa — Bieler (2021)

Unio cahabensis Lea, 1871
Lea, 1871. Proc. Acad. Nat. Sci. 23: 190.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 17 [21], pl. 5, fig. 14.
Type(s): FIGURED SYNTYPE USNM_84204, Cahaba R., Ala.

Quadrula (sec. Theliderma) cahabensis — Simpson (1900), Simpson (1914)
Quadrula (Bullata) pustulosa-vallata — Frierson (1927)
Quadrula (Pustulosa) pustulosa vallata — Haas (1969)
Quadrula pustulosa — Burch (1975)
Quadrula asperata — Williams et al. (2008)
Cyclonaias pustulosa — Lopes-Lima et al. (2019)

Quadrula pustulosa asperatus Utterback, 1915
‘Lea’ Utterback, 1915. Amer. Midl. Nat. 4(4): 134, pl. 17, figs. 42a-b.
(misidentified reference to Unio asperatus Lea, 1861)

Quadrula pustulosa — Parmalee & Bogan (1998)
Quadrula pustulosa pustulosa — Watters et al. (2009)

Unio petrinus Frierson, 1927
‘Call (Mss)’ Frierson, 1927. Check List N. Amer. Naiades: 49.
(intro'd as syn of Unio aureus Lea, 1859)

Quadrula (Bullata) aureus — Frierson (1927)
Cyclonaias pustulosa — Johnson et al. (2018)

Unio verrucosus albus of Authors, unknown year
Say of Authors.
(misidentified reference to Unio verrucosus albus Hildreth, 1828)

Unio dorfuillianus Lea, 1836
Lea, 1836. Synopsis Fam. Naiades: addenda. [nomen nudum]
(incorrect original spelling of Unio dorfeuillianus Lea, 1838)

Unio postulosus Lapham, 1860
‘Lea’ Lapham, 1860. Proc. Acad. Nat. Sci. 12: 155.
(error for Unio pustulosus Lea, 1831)

Margaron (Unio) spaericus Lea, 1870
‘Lea’ Lea, 1870. Synopsis Fam. Naiades: 33 [as ‘spæricus’].
(error for Unio sphaericus Lea, 1868)

Unio nodiferous Singley, 1893
‘Conrad’ Singley, 1893. Geol. Surv. Texas (1892): 319.
(error for Unio nodiferus Conrad, 1841)

Unio turgidis Singley, 1893
‘Lea’ Singley, 1893. Geol. Surv. Texas (1892): 319.
(error for Unio turgidus Lea, 1838)

Unio pustulosus Call, 1895
‘Lea’ Call, 1895. Trans. Acad. Sci. St. Louis 7: 42, pl. 15, figs. 3-4.
(reference to Unio pustulosus Lea, 1831)

Quadrula (sec. Theliderma) refulgens — Simpson (1900), Simpson (1914)