Unionoida | Unionoidea | Unionidae | Gonideinae | Contradentini | Lens species Lens eximius (Lea, 1856): specimens 2 nominal species as synonyms
Taxonomic History (since 2007)
Physunio eximius — Graf & Cummings (2007), Sri-aroon et al. (2007), Bogan (2010), IUCN (2012), He & Zhuang (2013), Zieritz et al. (2018)
Physunio cf. eximius — Bolotov et al. (2017)
Contradens eximius — Bolotov et al. (2017), Bolotov et al. (2018), Huang et al. (2019), Konopleva et al. (2019), Konopleva et al. (2019), Bolotov et al. (2020), Zieritz et al. (2020), Graf & Cummings (2021)
Lens eximius — Zieritz et al. (2021), Pfeiffer et al. (2021), Bolotov et al. (2022), Konopleva et al. (2023), Wu et al. (2024), Liu et al. (2024), Zieritz et al. (2024)
Physunio sp. 1 — Wu et al. (2021)
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Range: Mekong in Thailand, Cambodia, and Laos. Map of Georeferenced Specimens
![species map](../maps/map_4720.png) |
Cambodia |
![specimen](http://mussel-project.uwsp.edu/600dpi_images/04_12_13/bmnh_1968658_t.jpg) BMNH_1968658 Lao Mountains, Camboja
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_83899.jpg) USNM_83899 Laos Mountains, Cambodia
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Laos |
![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_225744.jpg) SMF_225744 Laos: Huai Kei bei Pakse
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_h19001.jpg) ANSP_H19001 Laos: Mekong at Pakse
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319366.jpg) SMF_319366 Laos: Mekong at Pakse
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_04_25/bmnh_mp_0722.jpg) BMNH_MP_0722 Laos: Mekong at Pakse
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Thailand |
![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786203.jpg) USNM_786203 Mun River, Ratchathani, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786204.jpg) USNM_786204 Mun River, Ban Tha Tom, Surin Prov., Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786206.jpg) USNM_786206 Pong River at Pong Nip Dam, Kaen Province, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786207.jpg) USNM_786207 Lam Chi River, Ban Wa Ma, Prov. Roi Ett, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786208.jpg) USNM_786208 Maenam Lam Chi near Ban Ta Sabaeng; Prov. Roi Ett; Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786220.jpg) USNM_786220 Lam Chi River, Mahachanachai, Ubon Ratchathani, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_291122.jpg) ANSP_291122 Siam
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_331303.jpg) ANSP_331303 Mae Nam Mun, Amphoe Tha Tum, Surin Prov. Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786270.jpg) USNM_786270 Thailand: Lam Chi at Ban Ta Nang Ruen, Ban Phai, Kon Kaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786273.jpg) USNM_786273 Gaeng Yang River, between Pimum and Chong Mek, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_06_14/mcz_254336.jpg) MCZ_254336 Thailand: Mun River, Ban Tha Tum, Surin Province
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_389038.jpg) ANSP_389038 Moon River, Ubon Prov., Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_06_14/mcz_266173.jpg) MCZ_266173 Thailand: Mun River, Ban Ta Tum
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/16_08_10/tmmubi_140.jpg) TMMUBI_140 Lam Dom Yai River
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/16_08_10/tmmubi_158.jpg) TMMUBI_158 Lam Dom Yai River
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/16_08_10/tmmubi_168.jpg) TMMUBI_168 Lam Dom Yai River
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/16_08_10/tmmubi_179.jpg) TMMUBI_179 Lam Dom Yai
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_198405.jpg) SMF_198405 Thailand: Lam Chi at Ban Ta Nang Ruen Ban Phai; Kon Kaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_198406.jpg) SMF_198406 Gaeng Yang River betw, Pimun and Chong Mek
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_05_07/fmnh_162652.jpg) FMNH_162652 Thailand, Maenam Mun, Ban Ta Tumm, Surin Prov.
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_205119.jpg) SMF_205119 Lam Chi Ban Ta Nang Ruen, Ban Phai, Kon Kaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/16_08_10/tmmubi_45.jpg) TMMUBI_45 Maenam Choen, W Kon Kean, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/16_08_10/tmmubi_46.jpg) TMMUBI_46 Lam chi, Ban MaMa - Tawarburi, Roi Ett, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_06_14/mcz_281040.jpg) MCZ_281040 Mun River at Rasi Salai, Sri Saket Prov. Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_06_14/mcz_281042.jpg) MCZ_281042 Lam Chi River, Mahachanachai, Ubon Ratchathani, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_06_14/mcz_281043.jpg) MCZ_281043 Thailand; Mun River at Ubon
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_06_14/mcz_281046.jpg) MCZ_281046 Thailand: Lam Chi River, Gantarawichai, Kalasin
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/06_06_27/usnm_83900_t.jpg) USNM_83900 Siam
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_br2581.jpg) SMF_BR2581 Thailand: Mun River at Tha Tum, Surin
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/16_08_10/smrl_2584.jpg) SMRL_2584 Mun River, Ban Ta Tum, Surin Prov. Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507820.jpg) UF_507820 Thom River at Rt. 2034 bridge. TH16-45. 16.122, 105.031
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_220840.jpg) SMF_220840 Thailand: Ban Kah Yung
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507829.jpg) UF_507829 Bang River at Rt. 2034 bridge approx. 5 km NW of intersection with Rt. 2277. TH16-47. 16.346, 104.883
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_346065.jpg) UF_346065 Thailand, Khon Kaen Province, 1.4km E intersection Highways 2038 and 12 Deep Muddy river, red clay banks, on rocks, wood and silty bottom 220 meters, 16° 29' N, 102° 25' E
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507851.jpg) UF_507851 Dom Noi River off Rt. 2248 approx. 3.5 km S of Buntharik. TH16-57. 14.728643, 105.398568
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507855.jpg) UF_507855 Dom Noi River off Rt. 2248 approx. 8.5 km S of Buntharik. TH16-58. 14.686046, 105.383334
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507862.jpg) UF_507862 Dom Yai River at Rt. 2248 bridge approx. 15 km ESE of Nam Yuen. TH16-59. 14.445989, 105.121116
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_h18995.jpg) ANSP_H18995 Lam Chi River, Ban Mama, Twatburi, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_h18996.jpg) ANSP_H18996 Manam Choen, 40 km W Khon Kaen, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_h18997.jpg) ANSP_H18997 Thailand: Pong River at Pong Nip Dam; Prov. Kon Kaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_h18998.jpg) ANSP_H18998 Thailand: Mun River, Ban Tha Tum, Surin Province
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_h18999.jpg) ANSP_H18999 Gaeng Yang River, between Pimum and Chong Mek, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_h19000.jpg) ANSP_H19000 Thailand: Lam Chi at Ban Ta Nang Ruen, Ban Phai
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_283246.jpg) SMF_283246 Mun River, Ban Ta Tum
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_283547.jpg) SMF_283547 Thailand: Lam Chi at Ban Ta Nang Ruen Ban Phai; Kon Kaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507475.jpg) UF_507475 Plai Mat River off HWY 2226/2175 in Tha Lat. JMP17-34. 15.28664, 102.68528
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507484.jpg) UF_507484 Chi River off of Hwy 202 in Lat Yai. JMP17-36. 15.75328, 102.25225
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507490.jpg) UF_507490 Chi River downstream of HWY 225 in Talat Raeng. JMP17-37. 15.76964, 101.81476
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_405723.jpg) USNM_405723 Menam Mun, Ubon, E. Siam
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_02_10/mnhn_mp_3077.jpg) MNHN_MP_3077 Mun River, Ban Ta Tum, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_02_10/mnhn_mp_3080.jpg) MNHN_MP_3080 Mun River at Sri Saket, Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_02_10/mnhn_mp_3082.jpg) MNHN_MP_3082 Mun River at Ban Tha Tum, Surin Prov., Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_09_05/ansp_125590.jpg) ANSP_125590 Siam
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188709.jpg) SMF_188709 Lam Chi, Gantarawichai, Kalasin
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_419836.jpg) USNM_419836 Sri Saket, Siam
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188712.jpg) SMF_188712 Thailand: Mun River (Maenam Mun) Ban Tha Tum
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188713.jpg) SMF_188713 Mun River Ban Kha Yung
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188714.jpg) SMF_188714 Pong River N Kon Kaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188715.jpg) SMF_188715 Pong River at Pong Nib Damn
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188716.jpg) SMF_188716 Thailand: Lam Chi Tha Sabaeng; Roi Ett
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188717.jpg) SMF_188717 Thailand: Mun River, Rasi Salai, Sri Saket
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188718.jpg) SMF_188718 Thailand: Lam Chi River, Mahachanachai; Ubon
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188719.jpg) SMF_188719 River Pong at dam
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_188711.jpg) SMF_188711 Moon [Mun] River, Ubon
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319352.jpg) SMF_319352 Thailand: Lam Chi River at Ban Ta Nang Ruen; Ban Phai Kon Kaen Province
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319353.jpg) SMF_319353 Thailand: Lam Chi Gantarawichai, Kalsin
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319355.jpg) SMF_319355 Mun River, Ban Ta Tum
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319356.jpg) SMF_319356 ThailandL: Mun River at Ubon Province
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319357.jpg) SMF_319357 Thailand: Mun River at Ubon
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319358.jpg) SMF_319358 Pong River Pa Nok Kao W Prov. Kon Kae
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319359.jpg) SMF_319359 Thailand: Mun River at Ban Huai Khayung, Surin
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319360.jpg) SMF_319360 Maenam Choen W Kon Kaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319361.jpg) SMF_319361 Thailand: Pong River at Phong Nip Dam Khonkaen
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319362.jpg) SMF_319362 Thailand: Lam Chi Tha Sabaeng; Roi Ett
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_05_05/ummz_230836.jpg) UMMZ_230836 Thailand: Mun River, Ban Tha Tum, Surin Province
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319363.jpg) SMF_319363 Lam Don Yai, Det Udon, Ubon
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319364.jpg) SMF_319364 Thailand: Mun River Rasi Salai, Sri Saket
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319365.jpg) SMF_319365 Lam Chi River, Ban Ma Wa, Distr. Tawatburi, Prov. Roi Ett
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507596.jpg) UF_507596 Mun River at confluence with Chi River. TH15-01. 15.18188, 104.71430
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/17_11_16/UF_507623.jpg) UF_507623 Pao River, trib. of Chi River at Rt. 214 bridge; Mun River drainage. TH15-06. 16.34022, 103.57584
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/14_07_21/smf_319477.jpg) SMF_319477 Huai Thuai, Tha Uthen, Nakon Phanom
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_04_25/bmnh_mp_0719.jpg) BMNH_MP_0719 Mun River at Ban Ta Tum, Surin Prov., Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_04_25/bmnh_mp_0720.jpg) BMNH_MP_0720 Mun River at Ban Ta Tum, Surin Prov., Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/12_04_25/bmnh_mp_0721.jpg) BMNH_MP_0721 Mun River at Ban Ta Tum, Surin Prov., Thailand
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![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_786196.jpg) USNM_786196 Thailand: Lam Chi River, Gantarawichai, Kalasin
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UF_346061_04 Thailand, Khon Kaen Province, 1.4km E intersection Highways 2038 and 12 Deep Muddy river, red clay banks, on rocks, wood and silty bottom 220 meters, 16° 29' N, 102° 25' E
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Vietnam |
![specimen](http://mussel-project.uwsp.edu/600dpi_images/11_11_14/usnm_632941.jpg) USNM_632941 Lao Bao, Vietnam
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Genbank Vouchers
ThailandRMBH_biv_121_3 (COI, 16S, ND1, 28S, 18S) Thailand: Mekong River basin, Phong River RMBH_biv_127_3 (COI, 16S, 28S) Thailand: Mekong River basin, Chi River RMBH_biv_121_2 (COI, 16S, 28S) Thailand: Mekong River basin, Phong River RMBH_biv_121_1 (COI, 16S, 28S) Thailand: Mekong River basin, Phong River RMBH_biv_127_2 (COI, 28S) Thailand: Mekong River basin, Chi River UF_507475 (ICH-02131) (COI, SRA) Thailand, Plai Mat River off HWY 2226/2175 in Tha Lat (15.28664, 102.68528) RMBH_biv_127_1 (COI, 28S) Thailand: Mekong River basin, Chi River UF_507851 (ICH-01175) (COI) Thailand, Dom Noi River off Rt. 2248 approx. 3.5 km S of Buntharik (14.728643, 105.398568) UF_507829 (ICH-00886) (COI) Thailand, Bang River at Rt. 2034 bridge approx. 5 km NW of intersection with Rt. 2277 (16.34636, 104.88315) UF_507475 (ICH-02131_AHE) (COI) Thailand, Plai Mat River off HWY 2226/2175 in Tha Lat (15.28664, 102.68528) UF_507820 (ICH-00868) (COI) Thailand, Thom River at Rt. 2034 bridge (16.122257, 105.030754) UF_507623 (2014-0622) (COI) Thailand, Pao River, trib. of Chi River at Rt. 214 bridge; Mun River drainage (16.34022, 103.57584) UF_507820 (ICH-00866) (COI) Thailand, Thom River at Rt. 2034 bridge (16.122257, 105.030754) UF_507829 (ICH-00884) (COI) Thailand, Bang River at Rt. 2034 bridge approx. 5 km NW of intersection with Rt. 2277 (16.34636, 104.88315) UF_507820 (ICH-00865) (COI) Thailand, Thom River at Rt. 2034 bridge (16.122257, 105.030754) UF_507855 (ICH-01184) (COI) Thailand, Dom Noi River off Rt. 2248 approx. 8.5 km S of Buntharik (14.686046, 105.383334) UF_507623 (2014-0625) (COI) Thailand, Pao River, trib. of Chi River at Rt. 214 bridge; Mun River drainage (16.34022, 103.57584) UF_507829 (ICH-00885) (COI) Thailand, Bang River at Rt. 2034 bridge approx. 5 km NW of intersection with Rt. 2277 (16.34636, 104.88315) UF_507820 (ICH-00867) (COI) Thailand, Thom River at Rt. 2034 bridge (16.122257, 105.030754) UF_507475 (ICH-02132) (COI) Thailand, Plai Mat River off HWY 2226/2175 in Tha Lat (15.28664, 102.68528) UF_507623 (2014-0624) (COI) Thailand, Pao River, trib. of Chi River at Rt. 214 bridge; Mun River drainage (16.34022, 103.57584) UF_507623 (2014-0623) (COI) Thailand, Pao River, trib. of Chi River at Rt. 214 bridge; Mun River drainage (16.34022, 103.57584)
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