species Rectidens sumatrensis (Dunker, 1852): synonymy

Synonymy

Unio sumatrensis Dunker, 1852

Dunker, 1852. Zeitschr. f. Malakozool. 9: 52.
TYPE ZMB_108722, Danau Luar, Sumatra.

Unio perakensis Morgan, 1885

specimen image from publication Morgan, 1885. Bull. Soc. Zool. France 10: 424, pl. 9, figs. 3-4.

Rectidens perakensis — Simpson (1900), Simpson (1914), Haas (1914)
Rectidens sumatrensis perakensis — Haas (1969)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio lingulatus Drouët & Chaper, 1892

specimen image from publication Drouët & Chaper, 1892. Mém. Soc. Zool. France 5: 149, pl. 5, figs. 7-9.
Drouët, 1893. J. de Conch. 41: 42.
SYNTYPE MNHN-IM-2000-1737, Borneo.

Rectidens lingulatus — Simpson (1900), Simpson (1914), Haas (1914), Graf & Cummings (2007), Bogan (2010), Zieritz et al. (2018), Graf & Cummings (2021), Sahidin et al. (2021)
Rectidens lingulatus lingulatus — Haas (1969)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio prolongatus Drouët, 1894

(homonym of Unio calamitarum var. B prolongata Fischer & Crosse, 1894)
Drouët, 1894. Rev. Biol. Nord France 6: 216, text fig. 1.
Drouët, 1895. J. de Conch. 43: 36, sp. 111.

Rectidens prolongatus — Simpson (1900), Simpson (1914), Haas (1914), Thiele (1934), Morrison (1966), Haas (1969)
Rectidens lingulatus prolongatus — Haas (1969)
Rectidens lingulatus — Graf & Cummings (2007), Graf & Cummings (2021)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Microcondylaea gracilis Strubell, 1897

Strubell, 1897. Nachr. Bl. Dtsch. Malak. Ges. 29: 8.
TYPE SMF_3610, S. Sumatra.

Rectidens gracilis — Simpson (1914), Haas (1914), Marwoto (1987)
Rectidens sumatrensis gracilis — Haas (1969)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio palembangensis Strubell, 1897

Strubell, 1897. Nachr. Bl. Dtsch. Malak. Ges. 29: 10.
TYPE SMF_3611, S. Sumatra.

Unio palembangensis — Martens (1900)
Rectidens palembangensis — Simpson (1914)
Rectidens gracilis — Haas (1914)
Rectidens sumatrensis gracilis — Haas (1969)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio pahangensis E.A. Smith, 1899

specimen image from publication E.A. Smith, 1899. Proc. Malac. Soc. London 3: 315, text fig.
HOLOTYPE (MONOTYPY) BMNH_99-9-4-1, Pahang River, Malay Pennisula.

Rectidens pahangensis — Simpson (1900), Simpson (1914)
Rectidens perakensis — Haas (1914)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio palembangensis var. pahumbaensis Martens, 1900

(intro'd as intra-sp. of Unio palembangensis Strubell, 1897)
Martens, 1900. Nachr. Bl. Dtsch. Malak. Ges. 32: 14 [as ‘pahumbaënsis’].

Unio palembangensis var. pahumbaënsis — Martens (1900)
Rectidens palembangensis var. pahumbaënsis — Simpson (1914)
Rectidens gracilis — Haas (1914)
Rectidens sumatrensis gracilis — Haas (1969)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio pressirostris Martens, 1900

Martens, 1900. Nachr. Bl. Dtsch. Malak. Ges. 32: 14.
TYPE ZMB_51794, Indragiri Fluss, Sumatra.

Unio pressirostris — Martens (1900)
Rectidens pressirostris — Simpson (1914), Haas (1914)
Rectidens sumatrensis pressirostris — Haas (1969)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio perakensis Preston, 1912

(renamed Rectidens prestoni Simpson, 1914; homonym of Unio perakensis Morgan, 1885)
specimen image from publication Preston, 1912. Rec. Ind. Mus. 7: 287, pl. 8, figs. 5-6.

Unio perakensis — Preston (1912)
Rectidens prestoni — Simpson (1914)
Rectidens perakensis — Haas (1914)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Rectidens prestoni Simpson, 1914

(new name for Unio perakensis Preston, 1912)
Simpson, 1914. Descr. Cat. Naiades: 1159.

Rectidens prestoni — Simpson (1914)
Rectidens sumatrensis — Pfeiffer et al. (2021)

Unio pahoembaensis Haas, 1912

(error for Unio palembangensis var. pahumbaensis Martens, 1900)
‘Martens’ Haas, 1912. Conch. Cab. 9 (pt. 2, h. 46): pl. 28, figs. 1-2.

Rectidens palembangensis var. pahumbaënsis — Simpson (1914)

Taxonomic History (since 1900)

Rectidens sumatrensis — Simpson (1900), Simpson (1914), Haas (1914), van Benthem Jutting (1953), Graf & Cummings (2007), ... Klymus et al. (2025), Campbell & Lydeard (2026), Wu et al. (2026), Zieritz et al. (2026), Li et al. (2026)
Rectidens lingulatus — Simpson (1900), Simpson (1914), Haas (1914), Graf & Cummings (2007), Bogan (2010), Zieritz et al. (2018), Graf & Cummings (2021), Sahidin et al. (2021)
Rectidens prolongatus — Simpson (1900), Simpson (1914), Haas (1914), Thiele (1934), Morrison (1966), Haas (1969)
Rectidens perakensis — Simpson (1900), Simpson (1914), Haas (1914)
Rectidens pahangensis — Simpson (1900), Simpson (1914)
Unio palembangensis — Martens (1900)
Unio palembangensis var. pahumbaënsis — Martens (1900)
Unio pressirostris — Martens (1900)
Unio perakensis — Preston (1912)
Rectidens pressirostris — Simpson (1914), Haas (1914)
Rectidens prestoni — Simpson (1914)
Rectidens gracilis — Simpson (1914), Haas (1914), Marwoto (1987)
Rectidens palembangensis — Simpson (1914)
Rectidens palembangensis var. pahumbaënsis — Simpson (1914)
Rectidens lingulatus lingulatus — Haas (1969)
Rectidens lingulatus prolongatus — Haas (1969)
Rectidens sumatrensis sumatrensis — Haas (1969)
Rectidens sumatrensis gracilis — Haas (1969)
Rectidens sumatrensis pressirostris — Haas (1969)
Rectidens sumatrensis perakensis — Haas (1969)

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