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Unionidae

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freshwater mussels
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Geography

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freshwater mussels
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Data last updated
Thu 22 January 2026

species Lens maenamensis Pfeiffer, Graf, Cummings & Page, 2021: specimens

1 available nominal species synonym (2 total synonyms)

Recent Taxonomic Opinions

Contradens crossei — Jeratthitikul et al. (2019), Konopleva et al. (2019), Bolotov et al. (2020), Graf & Cummings (2021)
Lens maenamensis — Pfeiffer et al. (2021), Jeratthitikul et al. (2021), Bolotov et al. (2022), Konopleva et al. (2023), Zieritz et al. (2024)

Range

Mekong Basin, Thailand, Cambodia, and Laos.

Map of Georeferenced Specimens

specimens map of Lens maenamensis

MUSSELp Specimen Records

SMF_MP_06

MNHN_MP_3770
Cochinchine

MNHN_MP_3774
Cochinchine

Cambodia

MNHN_MP_3780 Cambodge	MNHN_MP_3858 Cambodge	FMNH_21761 Cambodia
USNM_84061 Cambodia	USNM_84061 Cambodia	ANSP_125658 Cambodia, Asia
UMMZ_110006 Cambodia, French Indo China	UF_507397 Tonle Kong River just upstream of island, 8.3 miles NE of AH11 bridge near Stung Treng. CA16-04. 13.60938 ,106.09245	UF_507392 Tonle Sekong River, 1.6 miles upstream from AH11 Bridge. CA16-03. 13.54504, 106.01353
UF_507382 Tonle Srepok River, major bridge crossing on road from Stung Treng to Ban Lung. Srae Angkrorng, Ratanakiri, Cambodia. CA16-01. 13.44339, 106.60329

Laos

NCSM_84904 Asia, Mekong Basin/Bang Fai R. Laos, Khammouan, Mahaxay Co. Nam Oula, near Ban Phonexay, [2.93 air miles NNW center Ban Sang Phoc]. 17.36628° N, 105.3511° E	NCSM_84904 Asia, Mekong Basin/Bang Fai R. Laos, Khammouan, Mahaxay Co. Nam Oula, near Ban Phonexay, [2.93 air miles NNW center Ban Sang Phoc]. 17.36628° N, 105.3511° E	MNHN_MP_3092 Laos
MNHN_MP_3092 Laos	SMF_319231 Laos: Huai Nam Don NE Takek	SMF_319231 Laos: Huai Nam Don NE Takek
SMF_220848 Laos: Mekong at Takek	SMF_319249 Laos: Mekong River between Takek and Nakon Panom	SMF_188840 Mekong at Takek, Laos
SMRL_2346_40 Mekong between Takek and Nakon Panom, Thailand

Thailand

NCSM_26913 Asia, Mekong Basin/Mekong R. Thailand, Sakon Nakhon, Sakon Nakhon, [Point estimated in center of Sakon Nakhon]. 17.1667° N, 104.15° E	UF_507817 Bang Sai River at Rt. 2292 bridge. TH16-44. 16.737, 104.520	USNM_786277 Huai Mae Un at Sri Songkram, Nakon Prov. Thailand
SMF_319245 Huai Thuai, Tha Uthen, Nakon Panom	SMF_319245 Huai Thuai, Tha Uthen, Nakon Panom	SMF_188836 Maenam Kham, Tat Panaom
SMF_188843 Maenam Songkram Sri Songkram	MNHN_MP_3839 Maenam Songram, Prov. Saicon Nakon, thailand	USNM_419864 Nong Han, Sakon Nakon, E. Siam
UF_507767 Songkhram River at bridge W of Ban Na Si Nuan on Rt. 2281. TH16-30. 17.729, 103.411	UF_507633 Songkhram River at confluence with Mao River. TH15-11. 17.70202, 104.25579	UF_507641 Songkhram River at confluence with Yam River. TH15-12. 17.70906, 104.07671
UF_381376 Thailand, Nakhon Phanom Province, muddy bank of Songkhram River, near town of Si Song Khram, 17.6252°, 104.2426°	SMF_188844 Thailand: Huai Mae Un at Sri Songkram, Province Nakon Panom	SMF_319232 Thailand: Huai Mae Un bei Sri Songkram
USNM_786290 Thailand: Huai Mae Un, Sri Songkram, Nakon Panom	SMF_205125 Thailand: Huai Un at Sri Songkram	USNM_786289 Thailand: Maenam Songkram
USNM_786280 Thailand: Maenam Songkram Wanonivat [= Wanon Niwat], Sakon Nakon	BMNH_MP_0607 Thailand: Maenam Songkram, N of Wannonivat, Sakon Nakon Prov.	USNM_786278 Thailand: Maenam Songkram, Ta Uthen, Nakon Panom Province
SMF_188837 Thailand: Nakon Panom Prov. MAenam Songkram, Ta Uthen	MNHN_MP_3850 Thailand: Songkram River at Wannonivat [= Wanon Niwat], Sakon Nakon Prov.	BMNH_MP_0609 Thailand: Songkram River at Wannonivat [= Wanon Niwat], Sakon Nakon Prov.
SMF_188839 Thailands: Maenam Songkram Wanonivat; Sakon Nakon	UF_507804 Thuai River at Rt. 212 bridge S of Tha Uthen. TH16-39. 17.562, 104.609	UF_507784 Un River at bridge approx. 3 km E of Ban Na Wha. TH16-32. 17.480, 104.129
UF_507773 Un River at Rt. 222 bridge [error - Pla Hang at Rt 222 bridge] TH16-31. 17.443, 103.728

Genbank Vouchers

Georeferenced Genbank Vouchers

Cambodia

UF_507397 (ICH-00480). (COI: MT905645, go to Genbank) Cambodia, Tonle Kong River just upstream of island, 8.3 miles NE of AH11 bridge near Stung Treng (13.609383, 106.092445).

UF_507397 (ICH-00481). (COI: MT905646, go to Genbank) ditto.

UF_507397 (ICH-00482). (COI: MT905647, go to Genbank) ditto.

UF_507397 (ICH-00483). (COI: MT905648, go to Genbank) ditto.

UF_507397 (ICH-00484). (COI: MT905649, go to Genbank) ditto.

UF_507392 (ICH-00438). (COI: MT905626, go to Genbank) Cambodia, Tonle Sekong River, 1.6 miles upstream from AH11 Bridge (13.545038, 106.013527).

UF_507392 (ICH-00441). (COI: MT905629, go to Genbank) ditto.

UF_507392 (ICH-00442). (COI: MT905630, go to Genbank) ditto.

UF_507392 (ICH-00443). (COI: MT905631, go to Genbank) ditto.

UF_507392 (ICH-00444). (COI: MT905632, go to Genbank) ditto.

UF_507382 (ICH-00413). (COI: MT905613, go to Genbank) Cambodia, Tonle Srepok River, major bridge crossing on road from Stung Treng to Ban Lung (13.443388, 106.603294).

UF_507382 (ICH-00416_AHE). (COI: MT905615, go to Genbank) ditto.

UF_507382 (ICH-00416). (COI: MT905614, SRA: SRX8934367, go to Genbank) ditto.

Laos

MUMNH_UNI0946. (COI: MG582015, H3: MG582058, go to Genbank) Huai Thahao, Savannakhet, Laos (16° 51' 54.1" N 104° 54' 15.2" E).

MUMNH_UNI1174. (COI: MG582013, H3: MG582056, go to Genbank) Nam Don River, Thakhek, Khammouane, Laos (17° 26' 32.9" N 104° 51' 22.2" E).

MUMNH_UNI1111. (COI: MG582011, H3: MG582054, go to Genbank) Nam Hin Boun River, Hin Boun City, Khammouane, Laos (17° 35' 49.5" N 104° 37' 05.7" E).

MUMNH_UNI0956. (COI: MG582012, H3: MG582055, go to Genbank) Nam Pakan River, Nam Pakan, Khammouane, Laos (17° 39' 52.22" N 104° 37' 37.0" E).

MUMNH_UNI1164. (COI: MG582014, H3: MG582057, go to Genbank) Xe Nou River, Ban Dong Mak Fai, Savannakhet, Laos (17° 04' 22.3" N 105° 02' 54.9" E).

Thailand

MUMNH_UNI0215. (COI: MG582010, H3: MG582053, go to Genbank) Bung River, Phra Song, Na Kae, Nakhon Phanom, Thailand (17° 00' 40.1" N 104° 34' 06.2" E).

MUMNH_UNI0205. (COI: MG582009, H3: MG582052, go to Genbank) Kam River, Na Khu, Na Kae, Nakhon Phanom, Thailand (16° 57' 29.2" N 104° 30' 16.3" E).

MUMNH_UNI0253. (16S: MT993694, 28S: MT993746, COI: MG582007, H3: MG582050, go to Genbank) Songkhram River at Thung Fon, Udon Thani, Thailand (17° 27' 06.5" N, 103° 16' 50.4" E).

UF_507817 (ICH-00861). (COI: MT905819, go to Genbank) Thailand, Bang Sai River at Rt. 2292 bridge (16.736793, 104.519524) .

UF_507817 (ICH-00862). (COI: MT905820, go to Genbank) ditto.

UF_507767 (ICH-00781). (COI: MT905783, go to Genbank) Thailand, Songkhram River at bridge W of Ban Na Si Nuan on Rt. 2281 (17.72947, 103.410732).

UF_507767 (ICH-00782). (COI: MT905784, go to Genbank) ditto.

UF_507767 (ICH-00783). (COI: MT905785, go to Genbank) ditto.

UF_507633 (2014-0654). (COI: MT905552, go to Genbank) Thailand, Songkhram River at confluence with Mao River (17.70202, 104.25579).

UF_507641 (2014-0665). (COI: MT905554, go to Genbank) Thailand, Songkhram River at confluence with Yam River (17.709055, 104.076712).

UF_507641 (2014-0666). (COI: MT905555, go to Genbank) ditto.

UF_507641 (2014-0667). (COI: MT905556, go to Genbank) ditto.

UF_507804 (ICH-00837). (COI: MT905810, go to Genbank) Thailand, Thuai River at Rt. 212 bridge S of Tha Uthen (17.562192, 104.609067) .

UF_507804 (ICH-00838). (COI: MT905811, go to Genbank) ditto.

UF_507804 (ICH-00839). (COI: MT905812, go to Genbank) ditto.

UF_507804 (ICH-00840). (COI: MT905813, go to Genbank) ditto.

UF_507784 (ICH-00800). (COI: MT905792, go to Genbank) Thailand, Un River at bridge approx. 3 km E of Ban Na Wha (17.480165, 104.129469).

UF_507773 (ICH-00763). (COI: MT905779, go to Genbank) Thailand, Un River at Rt. 222 bridge (17.442618, 103.727625).

UF_507773 (ICH-00764). (COI: MT905780, go to Genbank) ditto.

MUMNH_UNI0271. (COI: MG582008, H3: MG582051, go to Genbank) Yam River, Charoen Sin, Charoen Sin, Sakon Nakhon, Thailand (17° 31' 56.1" N 103° 33' 39.0" E).