Abstract
We describe a new species of the genus Tylototriton from Ingyin Taung Mt., Mohnyin Township, Kachin State, Myanmar, based on morphological and molecular evidence. The new species is assigned to the subgenus Tylototriton s. str. and is clearly distinct from all known congeners by the following characters: medium body size; thin, long tail, lacking lateral grooves; rough skin; truncate snout; wide, protruding supratemporal bony ridges on head, beginning at anterior corner of orbit; weak, almost indistinct sagittal ridge; long, thin limbs, broadly overlapping when adpressed along body; distinct, wide, non-segmented vertebral ridge; 13 or 14 rib nodules; brown to dark-brown background coloration with dull orange-brown to yellowish-brown markings on labial regions, parotoids, rib nodules, whole limbs, vent, and ventral tail ridge. We also briefly discuss biogeography and species diversity of the genus Tylototriton in Myanmar.
Highlights
The salamandrid genus Tylototriton Anderson, 1871, or Crocodile Newts, currently includes 24 recognized species, inhabiting montane forest areas throughout the Asian monsoon climate zone from eastern Himalaya, southern and central China including Hainan Island, to northern Indochina including Vietnam, Laos, Thailand, and Myanmar (Hernandez, 2016; Wang et al, 2018)
Nishikawa et al (2014), based on the examination of specimens assigned to T. verrucosus collected from the Shan Plateau in eastern Myanmar and pet-trade animals assumed to originate from Myanmar, recently described a new species, T. shanorum Nishikawa, Matsui & Rao, 2014
Our data support the subdivision of Tylototriton into two major groups, traditionally regarded as subgenera: Tylototriton s. str. and Yaotriton
Summary
The salamandrid genus Tylototriton Anderson, 1871, or Crocodile Newts, currently includes 24 recognized species, inhabiting montane forest areas throughout the Asian monsoon climate zone from eastern Himalaya, southern and central China including Hainan Island, to northern Indochina including Vietnam, Laos, Thailand, and Myanmar (Hernandez, 2016; Wang et al, 2018). Molecular taxonomy methods have proven to be useful for deciphering taxonomic diversity of the genus Tylototriton, with 13 species (over 50%) described in the past five years (Grismer et al, 2018a; Hou et al, 2012; Khatiwada et al, 2015; Nishikawa et al, 2013a, 2013b, 2014; Phimmachak et al, 2015; Shen et al, 2012; Yang et al, 2014; Zhao et al, 2012). Recent molecular surveys indicate that our knowledge on taxonomic diversity of the genus Tylototriton is still far from complete, revealing several cryptic lineages likely corresponding to as yet undescribed species (Grismer et al, 2018a; Wang et al, 2018). Soon after, Phimmachak et al (2015) published sequence
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