Chiropterotriton aureus García-Castillo, Soto-Pozos, Aguilar-López, Pineda-Arredondo & Parra-Olea, 2018
Atzalan Golden Salamander; Salamandra Dorada de Atzalan
|Species Description: García-Castillo MG, Soto-Pozos ÁF, Aguilar-López JL, Pineda E, Parra-Olea G. 2018. Two new species of Chiropterotriton (Caudata: Plethodontidae) from central Veracruz, Mexico. Amphibian & Reptile Conservation 12(2) [Special Section]: 37–54 (e167).|
© 2019 Maria Delia Basanta (1 of 15)
At the time of the species description, there were 16 known species in the genus Chiropterotriton. Chiropterotriton aureus has key differences in its head, body, and limbs that differentiate it from the other species in the genus. Overall, C. aureus is a smaller and more slender species than others in the genus Chiropterotriton. One exception being that C. aureus differs from C. perotensis due to the former's larger size. However, C. aureus still has a longer tail and narrower head and feet than C. perotensis. Small size, narrow head, short limbs, long tail, and narrow feet differentiate C. aureus from C. ceronorum, C. melipona and C. totonacus. Chiropterotriton melipona also has longer limbs than C. aureus. Chiropterotriton aureus is smaller than C. casasi, although C. aureus does have a longer tail. Chiropterotriton casasi also has a longer head, longer limbs, and wider feet. Chiropterotriton chiropterus is larger, has longer limbs, a broader head, and larger feet when compared to C. aureus. Relative to C. orculus, C. aureus has a smaller body size, longer tail, smaller and narrower head, longer limbs in the female specimens, and narrower feet. Chiropterotriton lavae is overall larger, has longer limbs, and a broader head and feet (Parra Olea et al. 2020).
In life, the dorsal side of the head ranges from buff, yellow, or dark red with a lighter yellow at the snout, and parts of the eyelids. The gular region and lateral region is pale in color. The dorsal surface of the body is yellowish-orange with hints of green. There is a conspicuous line on the side of the body separating the yellowish-orange color from a darker black-gray color. The tail follows a similar pattern but gets progressively darker with light-colored speckling. The ventral side of the tail is pale in color. The feet and hands are nearly translucent with primarily beige fore- and hind limbs. The iris is orange-brown (García-Castillo et al. 2018).
In alcohol, the dorsal side is drab and while the ventral side is a lighter drab color (García-Castillo et al. 2018).
There is little variation between the specimens used to describe the species (García-Castillo et al. 2018).
Distribution and Habitat
Life History, Abundance, Activity, and Special Behaviors
A terrestrial species, C. aureus is found in arboreal bromeliads on oaks of cloud forests (García-Castillo et al. 2018). Salamanders in the Chiropterotriton genus are noted to typically engage in more activity, particularly foraging behaviors, during the night and spend the day in between dark, moist leaves. However, since C. aureus has been found in bromeliads, this suggests that instead of spending the day in between leaves, they could be residing in fallen logs or sinks (Perez-Ponce de Leon et al. 2011).
Assuming C. aureus displays similar reproductive biology and trends as other members of this genus, these salamanders partake in a fully terrestrial lifestyle, and females become sexually mature when they reach approximately two years and are typically 35 mm in size (Perez-Ponce de Leon et al. 2011; Rabb 1958).
Five Chiropterotriton sp. females were found with what scientists believed to be spermatophores in their cloacas, suggesting internal fertilization (Rabb 1958). This genus lays non-aquatic eggs in hidden spots such as bromeliads, underneath mosses, and in tree liverworts, where direct development occurs (Perez-Ponce de Leon et al. 2011). A different species in this genus (C. bromeliacia) has been observed to produce a clutch size ranging from 6 - 20 eggs, with larger females typically producing more eggs (Houck 1977).
Salamanders display an array of defense postures, maneuvers, and other tactics to avoid predation. Species in the genus Chiropterotriton have been noted to exhibit flipping behaviors and becoming immobile. Interestingly, Chiropterotriton salamanders showed an increased duration of remaining immobile at extreme temperatures, indicating that, at optimal temperatures, running or flipping away from predators is more advantageous (Dodd and Brodie 1976).
Trends and Threats
Currently, agriculture activities are the premiere threat to this species as, small-holder farming, grazing, and ranching have depreciated ideal habitat and displaced the C. aureus population. Although disruption is not ideal, C. aureus has shown tolerance for some habitat disturbance. Hence, its presence in adjacent agricultural fields. However, it likely relies on the cloud forest for survival. Thus, continued habitat modification from aforementioned threats forwards a decline in an already depauperate species (IUCN 2020).
Additionally, potential infection from the salamander chytrid fungus, Batrachochytrium salamandrivorans (Bsal), has caused great concern. Although not yet introduced to South America, this virulent amphibian pathogen has caused significant declines in European salamanders (Feldmeier et al. 2016), and its continued proliferation in Europe raises concern. C. aureus’ type locality is highly suitable for Bsal, and should the fungus arrive, infection and decline would be imminent (Basanta et al. 2019, Mexico Red List Assessment Workshop October 2019).
Possible reasons for amphibian decline
General habitat alteration and loss
At the time of the species description, Chiropterotriton consisted of 16 species, one being the newly described C. aureus. Based on Bayesian and Maximum Likelihood analyses of 1,477-bp matrix from two mitochondrial fragments, L2 (which includes 12S, tRNA, and 16S genes) and COI, as well as morphological characters, C. aureus has been distinguished as a unique species. Chiropterotriton aureus is sister to the clade composed of C. chiropterus, C. nubilus, and an undescribed species (García-Castillo et al. 2018).
Phylogenetic reconstructions of this genus have discriminated two primary Chiropterotriton assemblages, correlating to southern and northern distributions. Chiropterotriton aureus is a member of the southern assemblage (García-Castillo et al. 2018).
The species epithet, “aureus” is a derivative of the Latin word “aurum” meaning “gold” and the derivational suffix “-eus.” Together, the name means “made of gold, gold in color”, in reference to the unique dorsal characteristic of this species. This reference is also found in its common name: Atzalan Golden Salamander (García-Castillo et al. 2018).
Basanta, M.D., Rebollar, E.A., Parra-Olea, G. (2019). "Potential risk of Batrachochytrium salamandrivorans in Mexico." PloS one 14(2): e0211960. [link]
Dodd, C. K. Jr., and Brodie, E. D. Jr. (1976). ''Defense mechanisms of neotropical salamanders with an experimental analysis of immobility and the effect of temperature on immobility.'' Herpetological Monographs, 32, 269-290.
Feldmeier, S., Schefczyk, L., Wagner, N., Heinemann, G., Veith, M., Lötters, S., Gratwicke, B. (2016). “Exploring the distribution of the spreading lethal salamander chytrid fungus in its invasive range in Europe - a macroecological approach.” PloS one, 11(10), e0165682. [link]
García-Castillo MG, Soto-Pozos ÁF, Aguilar-López JL, Pineda E, Parra-Olea G. (2018). “Two new species of Chiropterotriton (Caudata: Plethodontidae) from central Veracruz, Mexico.” Amphibian and Reptile Conservation 12(2) [Special Section]: 37–54 (e167). [link]
Houck, L.D. (1977). ''Life history patterns and reproductive biology of neotropical salamanders.'' The Reproductive Biology of Amphibians. Taylor, D.H., Guttman, S.I., eds., Springer, New York, New York, 43–72.
IUCN SSC Amphibian Specialist Group. (2020). "Chiropterotriton aureus". The IUCN Red List of Threatened Species 2020: e.T150088930A150088935. https://dx.doi.org/10.2305/IUCN.UK.2020-2.RLTS.T150088930A150088935.en. Accessed on 07 February 2022.
Parra Olea, G., Garcia-Castillo, M. G., Rovito, S. M., Maisano, J. A., Hanken, J., Wake, D. B. (2020). “Descriptions of five new species of the salamander genus Chiropterotriton (Caudata: Plethodontidae) from eastern Mexico and the status of three currently recognized taxa.” PeerJ, 8:e8800 [link]
Pérez-Ponce de León, G., Mendoza-Garfias, B., Razo-Mendivil, U., Parra-Olea, G. (2011). "A new genus and species of Brachycoeliidae (Digenea) from Chiropterotriton sp. (Caudata: Plethodontidae) in Mexico and its phylogenetic position within the Plagiorchiida based on partial sequences of the 28S ribosomal RNA gene." Journal of Parasitology, 97(1), 128–134. [link]
Rabb, G. B. (1958). ''On certain Mexican salamanders of the plethodontid genus Chiropterotriton.'' Occasional Papers of the Museum of Zoology, 587, 1-37.
Originally submitted by: Olivia Lester, Sophia Pelletier, Alyssa Thomerson (2022-04-06)
Description by: Olivia Lester, Sophia Pelletier, Alyssa Thomerson (updated 2022-04-06)
Distribution by: Olivia Lester, Sophia Pelletier, Alyssa Thomerson (updated 2022-04-06)
Life history by: Olivia Lester, Sophia Pelletier, Alyssa Thomerson (updated 2022-04-06)
Trends and threats by: Olivia Lester, Sophia Pelletier, Alyssa Thomerson (updated 2022-04-06)
Comments by: Olivia Lester, Sophia Pelletier, Alyssa Thomerson (updated 2022-04-06)
Edited by: Ann T. Chang (2022-04-06)
Species Account Citation: AmphibiaWeb 2022 Chiropterotriton aureus: Atzalan Golden Salamander; Salamandra Dorada de Atzalan <https://amphibiaweb.org/species/8950> University of California, Berkeley, CA, USA. Accessed Nov 30, 2022.
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Citation: AmphibiaWeb. 2022. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 30 Nov 2022.
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