Tylototriton daloushanensis Zhou, Xiao & Luo, 2022
Mt. Dalou’s Knobby Newt, Da Lou Shan You Yuan (大娄山疣螈)
|Species Description: Luo, T., S. Yan, N. Xiao, W. Li, H. Deng, and J. Zhou. 2022. A new species of the genus Tylototriton (Amphibia: Urodela: Salamandridae) from the Eastern Dalou Mountains in Guizhou, China. Zoological Systematics 47:66–88.|
Tylototriton daloushanensis was previously confused with T. asperrimus and T. wenxianensis, however, molecular evidence suggests its more closely related to T. anhuiensis, T. broadoridgus, T. dabienicus, and T. maolanensis. Tylototriton daloushanensis can be differentiated from T. asperrimus by a head that is longer than wide, longer limbs, a longer fifth than first toe, and flattened and connected rib nodules in T. daloushanensis. The presences of a gular fold, longer limbs, a longer fifth than first toe in T. daloushanensis differentiates it from T. wenxianensis. Tylototriton anhuiensis, T. broadoridgus, and T. dabienicus can be distinguished by bony ridges on the head and a longer fifth than first toe in T. daloushanensis. A rounded snout in T. daloushanensis further distinguishes from T. broadoridgus, and T. maolanensis. Tylototriton daloushanensis has longer limbs than T. anhuiensis, and T. dabienicus, and shorter limbs than T. maolanensis (Luo et al. 2022). Please see Luo et al. (2022) for more details.
In life, the vast majority of the body is black in color with the exception of the bright orange regions of the head, palms and soles, cloacal stripe, and ventral tail stripe. Orange markings are noticeably absent on the posterior parotoids and rib nodules. In preservation, the black coloration fades to black brown and the orange fades to creamy yellow (Luo et al. 2022).
There is variation in relative tail length with some individuals having a tail that is shorter, longer, or equal to the snout-vent length. There is also some slight sexual dimorphism. Females may have a cloacal peripheral area that is the same color as the rest of the body, or a light bronze-orange band. Additionally, males have a longer, uplifted cloaca with small papillae on the inner wall while female cloacas are small with no papillae (Luo et al. 2022).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: China
Life History, Abundance, Activity, and Special Behaviors
The breeding season is believed to range from June to September. This is supported by a specimen found in June laying 39 eggs after collection (Luo et al. 2022).
Tylototriton daloushanensis can be found in sympatry with Boulenophrys jiangi, Leptobrachella suiyangensis, Odorrana kweichowensis, Odorrana margaretae, Odorrana yizhangensis, Panophrys qianbeiensis, Quasipaa spinosa, Rana omeimontis and Zhangixalus chenfui (Luo et al. 2022).
Trends and Threats
Possible reasons for amphibian decline
General habitat alteration and loss
Based on morphological and phylogenetic (Bayesian Inference and Maximum Likelihood) analyses on 16S and ND2 mtDNA, T. daloushanensis was placed in the T. wenxianesis species group within the subgenus Yaotriton. More specifically, it is sister to the clade composed of T. anhuiensis, T. broadoridgus, T. dabienicus, and T. maolanensis. Morphological characteristics that contributed to this assignment include: almost black body minus orange cranial region, bottoms of hands and feet, vent region, ventral tail stripe; a head that is longer than it is wide; presence of tubercles on dorsal and ventral surfaces almost equal sizing; transverse wrinkles absent on ventral skin; and interspaces between rib nodules are indistinct (Luo et al. 2022).
The species epithet, “daloushanensis,” is a reference to the location in which the species is found, Mt. Dalou in Guizhou Province, China (Luo et al. 2022).
Luo, T., Yan, S., Xiao, N., Li, W., Deng, H., Zhou, J. (2022). “A new species of the genus Tylototriton (Amphibia: Urodela: Salamandridae) from the Eastern Dalou Mountains in Guizhou, China.” Zoological Systematics. Beijing 47 [link]
Originally submitted by: Tyler Farnsworth (2022-12-20)
Description by: Tyler Farnsworth (updated 2022-12-20)
Distribution by: Tyler Farnsworth (updated 2022-12-20)
Life history by: Tyler Farnsworth (updated 2022-12-20)
Trends and threats by: Tyler Farnsworth (updated 2022-12-20)
Comments by: Tyler Farnsworth (updated 2022-12-20)
Edited by: Ann T. Chang (2022-12-20)
Species Account Citation: AmphibiaWeb 2022 Tylototriton daloushanensis: Mt. Dalou’s Knobby Newt <https://amphibiaweb.org/species/9535> University of California, Berkeley, CA, USA. Accessed May 29, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 29 May 2023.
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