Unio favidens var. marcens Benson, 1862
Benson, 1862. Ann. Mag. Nat. Hist. 10: 188.
(intro'd as intra-sp. of Unio favidens Benson, 1862)
Type(s): POSSIBLE SYNTYPE MCZ_175550, Berhampooter River, Assam, India.

Parreysia (s.s.) favidens — Simpson (1900), Preston (1912), Simpson (1914)
Parreysia (s.s.) favidens var. marcens — Preston (1915), Ramakrishna & Dey (2007)
Parreysia favidens — Haas (1969)
Parreysia (s.s.) f. marcens — Subba Rao (1989)
Parreysia favidens marcens — IUCN (2011)
Parreysia (corrugata-group) corrugata — Bolotov et al. (2022)
Parreysia (keralaensis-group) marcens — Bolotov et al. (2024)

Unio gowhattensis Theobald, 1873
Theobald, 1873. J. Asiat. Soc. Bengal 42: 208, pl. 17, fig. 4-a.

Parreysia (s.s.) gowhattenensis [sic] — Simpson (1900)
Parreysia (s.s.) gowhattensis — Preston (1912), Simpson (1914), Preston (1915), Subba Rao (1989), Graf & Cummings (2007), Ramakrishna & Dey (2007)
Parreysia gowhattensis — Haas (1969), Bogan (2010), IUCN (2010), Graf & Cummings (2021)
Parreysia (corrugata-group) corrugata — Bolotov et al. (2022)
Parreysia (keralaensis-group) marcens — Bolotov et al. (2024)

Parreysia favidens var. assamensis Preston, 1912
‘Nevill, MS’ Preston, 1912. Rec. Ind. Mus. 7: 299.
‘Nevill MS’ Preston, 1915. Fauna Brit. India: 161, text fig. 12.
(intro'd as intra-sp. of Unio favidens Benson, 1862)

Parreysia (s.s.) favidens var. assamensis — Preston (1912), Simpson (1914), Preston (1915), Ramakrishna & Dey (2007)
Parreysia favidens — Haas (1969)
Parreysia (s.s.) favidens assamensis — Subba Rao (1989)
Parreysia favidens assamensis — IUCN (2011)
Parreysia (corrugata-group) corrugata — Bolotov et al. (2022)
Parreysia (keralaensis-group) marcens — Bolotov et al. (2024)

Parreysia (Parreysia) annandalei Preston, 1912
Preston, 1912. Rec. Ind. Mus. 7: 302.
Preston, 1915. Fauna Brit. India: 173, text fig. 18.
Type(s): TYPES ZSI_M2490-1, Gowhatty.

Parreysia (s.s.) annandalei — Preston (1912), Simpson (1914), Preston (1915), Subba Rao (1989), Graf & Cummings (2007), Ramakrishna & Dey (2007)
Parreysia favidens — Haas (1969)
Parreysia annandalei — Bogan (2010), IUCN (2010), Graf & Cummings (2021)
Parreysia (corrugata-group) corrugata — Bolotov et al. (2022)
Parreysia (keralaensis-group) marcens — Bolotov et al. (2024)

Parreysia corrugata Imsong & Murali, 2023
Imsong & Murali, 2023. Uttar Pradesh J. Zool. 44(20): 32, fig. 1G.
(misidentified reference to Mya corrugata Müller, 1774)

Parreysia (keralaensis-group) marcens — Bolotov et al. (2024)