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Higher TaxaGeoemydidae (Geoemydinae), Testudinoidea, Testudines (turtles)
Common NamesThai: Tao na Isan
English: Isan Snail-eating turtle, Khorat snail-eating turtle
German: Isan-Schneckenfresser
French: Malayémyde d’Isan 
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 
DistributionNE Thailand (Nakhon Ratchasima)

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  
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.

Diagnosis (khoratensis): Malayemys species with a straight carapace length below 20 cm and a tricarinate, blackish-brown carapace, and a blackish-brown head with distinct yellowish facial stripes. Malayemys khoratensis differs from M. macrocephala by the following characters: (1) first ver- tebral scute roughly square and not tapered posteriorly (V1W/V1L: 0.83±0.09 vs. 0.74±0.19 in females, 0.83±0.12 vs. 0.69±0.09 in males); (2) lower marginal scutes 8–12 with a pattern of diagonal to cone-shaped blackish brown blotches originating from the outer posterior corner vs. narrow blackish-brown bars at the posterior sutures; (3) infraorbital stripe not or rarely reaching the loreal seam, not broadened at the suture vs. always reaching the loreal seam and usually distinctly broadened at the suture; (4) infraorbital stripes only slightly curved below of tyrosine (T) at positions 111, 387, 388,615, 616 of the 1078-bp-long reference alignment of the cyt b gene (S1 FASTA). 
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.

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). 
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.
M. khoratensis was named after the Khorat Basin, the watershed to which the range of the new species appears to be restricted. 
  • 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
  • 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; 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. (Ed 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.). Chelonian Research Monographs 8:1–472. doi:10.3854/crm.8.checklist.atlas.v9.2021. - get paper here
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