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Malayemys macrocephala (GRAY, 1859)

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Higher TaxaGeoemydidae (Geoemydinae), Testudinoidea, Testudines (turtles)
Common Names 
SynonymGeoclemys macrocephala GRAY 1859
Geoclemys macrocephala GRAY 1860: 501
Malayemys macrocephala — BROPHY 2004
Malayemys macrocephala — TTWG 2014
Malayemys macrocephala — TTWG 2021 
DistributionCambodia, West Malaysia, Myanmar, Thailand (river systems of Chao Phraya and Mae Klong)

Type locality: “Siam”, restricted to Thanyaburi, Pathum Thani Province, Thailand (Chao Phraya River Basin; approx. 50 km NNE of Bangkok; 14.017° N, 100.733° E).  
TypesLectotype: BMNH 1947.3.4.51-.52 
CommentBROPHY (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.

Type species: Geoclemys macrocephala GRAY 1859 is the type species of the genus Damonia GRAY 1869 (pre-occupied by Damonia ROBINEAU-DESVOIDY 1847, Diptera). Malayemys LINDHOLM 1931 is a nomen novum pro Damonia. Note that Lindhom 1931 considered M. subtrijuga as the type species and M. macrocephala was considered as a synonym of M. subtrijuga (e.g. by WERMUTH & MERTENS 1977: 46).

Behavior: nocturnal (Sumontha et al. 2016), but also diurnal (F. Ihlow, pers. comm. 19 April 2016).

Habitat: freshwater (Rivers, swamps, ponds) 
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