species Disconaias disca (Lea, 1838): synonymy

Unio discus Lea, 1838

Lea, 1836. Synopsis Fam. Naiades: addenda. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 74, pl. 18, fig. 57.
Type(s): HOLOTYPE (MONOTYPY) USNM_85341, Found in sand ballast, Phila, Pa [Mexico].

Unio (sec. Elliptio) discus — Simpson (1900), Simpson (1914)
Unio (Lampsilis) discus — Martens (1900)
Lampsilis discus — Pilsbry (1910)
Lampsilis (Disconaias) discus — Frierson (1927), Haas (1929), Haas (1940), Haas (1969), Haas (1969)
Lampsilis (sec. Disconaias) discus — Thiele (1934)
Disconaias disca — R.I. Johnson (1998), Contreras-Arquieta (2000), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Cummings et al. (2025)
Disconaias discus — Czaja et al. (2023)

Unio panacoensis von dem Busch in Philippi, 1843

von dem Busch in Philippi, 1843. Abbild. Beschr. Conch. 1: 75, pl. 2.
Type(s): LECTOTYPE MCZ_178882 (by R.I. Johnson, 1998: 434), Panaco [Panuco River, near] Tampico, [Tamulipas State], Mexico.

Unio (sec. Elliptio) discus — Simpson (1900), Simpson (1914)
Unio (Lampsilis) discus var. panucoensis [sic] — Martens (1900)
Lampsilis discus — Pilsbry (1910)
Lampsilis (Disconaias) panucoensis [sic] — Frierson (1927)
Lampsilis (Disconaias) panacoensis — Haas (1969)
Disconaias disca — R.I. Johnson (1998), Graf & Cummings (2021), Cummings et al. (2025)
Disconaias panacoensis — Graf & Cummings (2007), Bogan (2010), Czaja et al. (2023)

Unio mexicanus Sowerby, 1867

(homonym of Unio mexicanus Philippi, 1847)
Sowerby, 1867. Conch. Icon. 16: pl. 55, sp. 281.
Type(s): HOLOTYPE (MONOTYPY) BMNH_79-2-26-249, Mexico.

Unio (sec. Elliptio) discus — Simpson (1900), Simpson (1914)
Unio (Lampsilis) discus var. connectens — Martens (1900)
Lampsilis (Disconaias) panucoensis [sic] — Frierson (1927)
Lampsilis (Disconaias) panacoensis — Haas (1969)
Disconaias disca — R.I. Johnson (1998), Cummings et al. (2025)

Unio lapidosus ‘Villa in sched.’ Kobelt, 1893

‘Villa in sched.’ Kobelt, 1893. Nachr. Bl. Dtsch. Malak. Ges. 25: 151.
‘Villa in sched.’ Kobelt, 1893. Icon. Land- und Süssw.-Moll. 6: 90, pl. 176, fig. 1120.
Type(s): HOLOTYPE (MONOTYPY) ZMB_17236, Nordmexiko.

Unio (sec. Lapidosus) lapidosus — Simpson (1900)
Unio (Lampsilis) discus var. panucoensis [sic] — Martens (1900)
Lampsilis discus — Pilsbry (1910)
Unio (sec. Elliptio) discus — Simpson (1914)
Lampsilis (Disconaias) panucoensis [sic] — Frierson (1927)
Lampsilis (Disconaias) discus — Haas (1940)
Lampsilis (Disconaias) panacoensis — Haas (1969)
Disconaias disca — R.I. Johnson (1998), Cummings et al. (2025)

Unio panucoensis ‘von dem Busch’ of Authors

(error for Unio panacoensis von dem Busch in Philippi, 1843)
‘von dem Busch’ of Authors.
Martens, 1900. Biol. Centr.-Amer., Moll.: 510, 651.
Pilsbry, 1910. Proc. Acad. Nat. Sci. 61: 533.
Simpson, 1914. Descr. Cat. Naiades: 603.
Frierson, 1927. Check List N. Amer. Naiades: 82.

Unio (Lampsilis) discus var. connectens Martens, 1900

(intro'd as intra-sp. of Unio discus Lea, 1838)
‘von dem Busch’ Küster, 1861. Conchyl. Cab. 9(2): 242, pl. 81, fig. 1 [as ‘Unio panacoensis’].
Sowerby, 1867. Conch. Icon. 16: pl. 55, sp. 281 [as ‘Unio mexicanus’].
Martens, 1900. Biol. Centr.-Amer., Moll.: 510.
Type(s): LECTOTYPE ZMB/MOLL.305852 (by Cummings et al., 2025: 177), Rio Panuco, near Tampico.

Unio (Lampsilis) discus var. connectens — Martens (1900)
Lampsilis discus — Pilsbry (1910)
Unio (sec. Elliptio) discus — Simpson (1914)
Lampsilis (Disconaias) panucoensis [sic] — Frierson (1927)
Lampsilis (Disconaias) panacoensis — Haas (1969)
Disconaias disca — R.I. Johnson (1998), Cummings et al. (2025)

Unio panacoensis Küster, 1861

(reference to Unio panacoensis von dem Busch in Philippi, 1843)
‘von dem Busch’ Küster, 1861. Conchyl. Cab. 9(2): 242, pl. 81, fig. 1.

Unio (Lampsilis) discus var. connectens — Martens (1900)