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Malayemys khoratensis IHLOW, VAMBERGER, FLECKS, HARTMANN, COTA, MAKCHAI, MEEWATTANA, DAWSON, KHENG, RÖDDER & FRITZ, 2016

IUCN Red List - Malayemys khoratensis - Least Concern, LC
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Higher TaxaGeoemydidae (Geoemydinae), Testudinoidea, Testudines (turtles)
Subspecies 
Common NamesThai: Tao na Isan
English: Isan Snail-eating turtle, Khorat snail-eating turtle
German: Isan-Schneckenfresser
French: Malayémyde d’Isan 
SynonymMalayemys khoratensis IHLOW, VAMBERGER, FLECKS, HARTMANN, COTA, MAKCHAI, MEEWATTANA, DAWSON, KHENG, RÖDDER & FRITZ 2016
Malayemys isan SUMONTHA, BROPHY, KUNYA, WIBOONATTHAPOL & PAUWELS 2016
Malayemys subtrijuga — STUART & PLATT 2004: 135
Malayemys subtrijuga — KUBOTA et al. 2015: 23
Malayemys khoratensis — KWET 2017
Malayemys khoratensis — TTWG 2017
Malayemys khoratensis — THOMSON & LAMBERTZ 2017
Malayemys khoratensis — TTWG 2021
Malayemys khoratensis — STUART et al. in WCS 2024
Malayemys khoratensis — TTWG 2025 
DistributionNE Thailand (Nakhon Ratchasima), Laos

khoratensis: Type locality: “Udon Thani, Udon Thani Province, Thailand (17.36555°N, 102.81427°E)”

isan: Type locality: Ban Na Klang (17°14'48.728"N, 102°12'32.479"E), Na Klang Sub-district, Na Klang District, Nong Bua Lamphu Province, northeastern Thailand  
Reproduction 
TypesHolotype: THNHM 25609 (field number MS 571), adult female.
Paratypes (6 specimens): adult males: ZMKU Rep-000318 (field number MS 573) and PSUZC RT 716 (field number MS 574); subadult male: QSMI 1396; adult females: CUMZ-R-0.2321 (field number MS 572) and PSUZC RT 717 (field number MS 575); juvenile: QSMI 1395 (field number MS 577); same locality data as holotype.
Holotype: THNHM 25816, young, adult female (Fig 6) from Udon Thani, Udon Thani Province, Thailand (17.36555°N, 102.81427°E, WGS 1984), collected in July 2014 by FI and MC; Paratypes: THNHM 25999, adult female, Udon Thani, Thailand); ZFMK 97198, adult male, Udon Thani, Thailand; MTD 49150, female, Udon Thani, Thailand. [khoratensis] 
DiagnosisDiagnosis (isan): The new species is a medium-sized Malayemys species reaching a maximum carapace length of at least 152 mm in males and 206 mm in females, characterized by the consistent combination of (1) only two nasal stripes, (2) a thin, often discontinuous, infraorbital stripe that never reaches the loreal seam, (3) an uninterrupted supraorbital stripe, and (4) the absence of stripes or light spots between the infra- and supraorbital stripes.


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CommentMalayemys isan was described in a paper published on 26 March 2016 while that of M. khoratensis was published on 6 April 2016. The two species are synonymous based on O. Pauwels, pers. comm., 9 April 2016. TTWG 2017 decided to give khoratensis priority as isan did not comply with ICZN rules (Zoobank registration) of online publications. This was confirmed by Thomson & Lambertz 2017.

Etymology: „Isan‟ is a Thai word designating the northeastern region of Thailand, where the type locality of the new species lies. It is here used as a noun in apposition, invariable.

Distribution: see map in Ihlow et al. 2016.

Habitat: aquatic, in shallow, stagnant or slow-moving freshwater bodies

Behavior: nocturnal (Sumontha et al. 2016), but also diurnal (F. Ihlow, pers. comm. 19 April 2016). 
EtymologyM. khoratensis was named after the Khorat Basin, the watershed to which the range of the new species appears to be restricted. 
References
  • Bour, R. 2008. Global diversity of turtles (Chelonii; Reptilia) in freshwater. Hydrobiologia 595:593–598 - get paper here
  • Ihlow F, Vamberger M, Flecks M, Hartmann T, Cota M, Makchai S, et al. 2016. Integrative Taxonomy of Southeast Asian Snail-Eating Turtles (Geoemydidae: Malayemys) Reveals a New Species and Mitochondrial Introgression. PLoS One 11 (4): e0153108, doi:10.1371/journal.pone.0153108 - get paper here
  • Kubota, M., S. Saito, S. Ichikawa, M. Kaneko, S. Fuchigami, A. Imamura and K. Ishibashi 2015. Mizube no Sachi -- Gift of Waterfront. Illustrated Handbook of Edible Plants and Animals Indigenous to the Mekong River Basin. Nagao Natural Environment Foundation, Tokyo: 445
  • Kwet, Axel 2017. Neue Arten: Liste der im Jahr 2016 neu beschriebenen Reptilien. Terraria-Elaphe 2017 (3): 54-70 - get paper here
  • MOKARAT, MONTHAKARN; APICHAYA RUANGSAKUNPORN, THOTSAPOL CHAIANUNPORN, KHEMIKA LOMTHAISONG, MARK GREGORY ROBSON & SARUN KEITHMALEESATTI. 2022. Heavy metal contamination and bioaccumulation in Khorat snail-eating turtles (Malayemys khoratensis) from an e-waste recycling activity site in Thailand. Human and Ecological Risk Assessment: An International Journal 28(1): 133–153. - get paper here
  • Platt, S.G.; Boutxakittilah, S.; Phaxaiyaphet, V.; Zalinge, R.N. van; Haislip, N.A.; Rainwater, T.R. 2024. Natural history notes: Malayemys khoratensis (Khorat Snail-eating Turtle). Nesting habitat and nest construction. Herpetological Review 55 (1): 85-87.
  • Platt, Steven G.; Oudomxay Thongsavath, Samuel C. Leslie, Peter Brakels, Jeffery E. Dawson, Flora Ihlow & Thomas R. Rainwater 2022. On the Occurrence of the Khorat Snail-Eating Turtle (Malayemys khoratensis) in Lao People's Democratic Republic with Notes on Traditional Ecological Knowledge and Exploitation Chelonian Conservation and Biology 21(1): 11–19. - get paper here
  • Stuart, Bryan and Steven G. Platt 2004. Recent records of turtles and tortoises from Laos, Cambodia, and Vietnam. Asiatic Herpetological Research 10: 129-150 - get paper here
  • Sumontha, Montri; Timothy R. Brophy, Kirati Kunya, Suthep Wiboonatthapol and Olivier S. G. Pauwels 2016. A new snail-eating turtle of the genus Malayemys Lindholm, 1931 (Geoemydidae) from Thailand and Laos. Taprobanica 8 (1): 1–9 - get paper here
  • Thomson, Scott and Markus Lambertz 2017. On the Nomenclatural Status of the Recently Described Snail-eating Turtle from Southeast Asia (Testudines, Geoemydidae): Malayemys khoratensis vs. Malayemys isan. Chelonian Conservation and Biology Dec 2017, Vol. 16, No. 2: 239-245. - get paper here
  • TTWG [TURTLE TAXONOMY WORKING GROUP: RHODIN, A.G.J., IVERSON, J.B., FRITZ, U., GALLEGO-GARCÍA, N., GEORGES, A., SHAFFER, H.B., AND VAN DuK, P.P.]. 2025. Turtles of the World: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status (10th Ed.). In: Rhodin, A.G.J., Iverson, J.B., van Dijk, P.P., Stanford, C.B., Goode, E.V., Buhlmann, K.A., and Mittermeier, R.A. (Eds.). Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN SSC Tortoise and Freshwater Turtle Specialist Group. Chelonian Research Monographs 10:1-575 - get paper here
  • TTWG; Anders G.J. Rhodin, John B. iverson, Roger Bour, Uwe Fritz, Arthur GeoRges, H. BRadley Shaffer, and Peter Paul van Dijk 2017. Turtles of the World: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status (8th Ed.). In: Rhodin, A.G.J., Iverson, J.B., van Dijk, P.P., Saumure, R.A., Buhlmann, K.A., Pritchard, P.C.H., and Mittermeier, R.A. (Eds.). Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group. Chelonian Research Monographs 7:1–292. doi: 10.3854/crm.7.checklist.atlas.v8.2017 - get paper here
  • TTWG; Rhodin, A.G.J., Iverson, J.B., Bour, R., Fritz, U., Georges, A., Shaffer, H.B., and van Dijk, P.P. 2021. Turtles of the World: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status (9th Ed.). In: Rhodin, A.G.J., Iverson, J.B., van Dijk, P.P., Stanford, C.B., Goode, E.V., Buhlmann, K.A., and Mittermeier, R.A. (Eds.). Conservation Biology of Freshwater Turtles and Tortoises: A Compilation Project of the IUCN/SSC Tortoise and Freshwater Turtle Specialist Group. Chelonian Research Monographs 8:1–472. doi:10.3854/crm.8.checklist.atlas.v9.2021. - get paper here
  • WCS 2024. Wildlife in Lao PDR, 2024 Status Report. Vientiane; Wildlife Conservation Society Lao PDR Program
 
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