Malayemys subtrijuga (SCHLEGEL & MÜLLER, 1845)
Can you confirm these amateur observations of Malayemys subtrijuga?
|Higher Taxa||Geoemydidae (Geoemydinae), Testudinoidea, Testudines (turtles)|
|Common Names||E: (Malayan) Snail-eating Turtle|
G: Malaiischer Schneckenfresser
|Synonym||Emys hermanni SCHWEIGGER 1812: 311 (?)|
Emys subtrijuga SCHLEGEL & MÜLLER in TEMMINCK 1845
Emys nuchalis BLYTH 1863: 82
Damonia (?) crassiceps GRAY 1870
Damonia oblonga GRAY 1871: 367
Damonia subtrijuga, BOULENGER 1889
Cistudo gibbosa BLEEKER 1889 (nomen nudum)
Malayemys subtrijuga, LINDHOLM 1931: 30
Malayemys subtrijuga — MANTHEY & GROSSMANN 1997: 450
Malayemys subtrijuga — COX et al. 1998: 129
Malayemis [sic] subtrijuga — CHAN-ARD et al. 1999: 226
Malayemys subtrijuga — SCHILDE 2004
Malayemys subtrijuga — BROPHY 2004
Malayemys subtrijuga — TTWG 2014
|Distribution||S Vietnam (Mekong drainage), Cambodia, E Thailand, Laos, introduced to Indonesia (Sumatra, Java)|
Type locality: Java
|Types||Lectotype: RMNH RENA.6085, other syntypes: 6084, and 6085; paralectotypes: RMNH RENA.6082 and 6084. The lectotype is pictures as Emys trijuga in Boie "Erp. Java" on pl. III (fide Hoogmoed & E. Dondorp, pers. comm., 28 Jan 2019). See also comment).|
|Comment||Synonymy: following Wermuth & Mertens 1977|
BROPHY (2004) separated M. subtrijuga from M. macrocephala which was previously considered as a synonym of M. subtrijuga. According to BROPHY (2004) the two forms differ by the following characters (sorry about the cryptic abbreviations - the text was copied directly from BROPHY’s abstract):
Turtles from the Mekong River Basin retain the name Malayemys subtrijuga (Schlegel and Müller,1844), whereas those from the Chao Phraya and Mae Klong river basins, coastal areas of south-eastern Thailand, and the Malay
Peninsula are assigned the name M. macrocephala. M. macrocephala has four or fewer nasal stripes (99%) and an infraorbital stripe that is relatively wide at the loreal seam (98%of InfSW/HW=0.07-0.18) and does not extend or extends only slightly superior to the loreal seam (96%). Conversely, M.subtrijuga has six or more nasal stripes (89%) and an infraorbital stripe that is relatively narrow at the loreal seam (92% of InfSW/HW=0.02-0.06), extends completely superior to the loreal seam (96%), and usually joins the supraorbital stripe (64%). Female M. macrocephala also have relatively longer AnL and relatively shorter Vert5L and PecL than M. subtrijuga. Similarly, male M. macrocephala have relatively longer PPLL and AbdL, relatively shorter Pleu1L and PecL, and greater RLatK values than M. subtrijuga.
Types: Iverson (1986:50, 1992:138) listed BMNH 1922.214.171.124 as the holotype for M. subtrijuga based on an entry in the BMNH species catalog (King and Burke 1997). For a more detailed discussion on types see BROPHY 2004.
Behavior: nocturnal (Sumontha et al. 2016), but also diurnal (F. Ihlow, pers. comm. 19 April 2016).
Habitat: freshwater (Rivers, swamps, ponds)