Species Description: Formas JR, Cuevas CC, Brieva LM 2002 A new species of Alsodes (Anura: Leptodactylidae) from Cerro Mirador, Cordillera Pelada, southern Chile. Proc Biol Soc Washington 115:708-719
This frog is considered large for an Alsodes species. A yellow tinged triangle is found on the head. There is no columella in A. valdiviensis versus a presence in A. vanzolinii and A. nodosus. The transverse process of the sixth vertebra is located to the side in A. valdiviensis, to the front in A. gargola, and to the back in A. vanzolinii. This species has 26 chromosomes, distinguishing it from the morphologically similar A. barrioi which has 34 chromosomes. Alsodes nodosus has 22 chromosomes and has black bars on the limbs which are not found in A. valdiviensis. Alsodes valdiviensis can be distinguished from A. tumultuosis, A. kaweshkari, and A. australis using various physical morphologies since all these species have 26 chromosomes and appear otherwise similar. Alsodes tumultuosis shows median amount of webbing rather than highly reduced webbing, as well as a spotting pattern on the top rather than stripes seen in A. valdiviensis. Alsodes kaweshkari has no webbing between toes, only toe fringes. Alsodes australis has a rounded versus truncated snout (Formas et al. 2002).
When in alcohol, dorsal surfaces are grey and a triangle of lighter grey may be seen on the head. The space between the eye and nostrils is spotted black. A dark grey triangular stripe extends from the top of the head between the eyes toward the back of the frog. The ventrum is grey and the throat is white, while the posterior side of the legs and the area around the vent is dark brown. Live specimens exhibit a yellow color to the triangle on the head, and the stripe on the head is light brown. The dorsum and limbs are light brown and gold. The ventrum and throat is white. Eyes are black with bronze reticulations (Formas et al. 2002).
Distribution and Habitat
Life History, Abundance, Activity, and Special Behaviors
Trends and Threats
This species belongs to the Alsodes monticola group. It was identified based on karyotype, C-band chromosomal pattern, and osteology (Formas et al. 2002).
The species epithet, valdiviensis refers to the Valdivia Province where this species was found (Formas et al. 2002).
The species has a diploid chromosome number of 2N = 26 (Formas et al. 2002).
Formas, J. R., Cuevas, C. C., and Brieva, L. M. (2002). ''A new species of Alsodes (Anura, Leptodactylidae) from Cerro Mirador, Cordillera Pelada, southern Chile.'' Proceedings of the Biological Society of Washington, 115, 708-719.
Formas, R. (2004). Alsodes valdiviensis. The IUCN Red List of Threatened Species 2004: e.T56320A11458975. http://dx.doi.org/10.2305/IUCN.UK.2004.RLTS.T56320A11458975.en. Downloaded on 01 June 2016.
Written by Sabrina Dean (sjdean AT ucsc.edu), University of California Santa Cruz
First submitted 2016-07-15
Edited by Ann T. Chang (2016-07-28)
Species Account Citation: AmphibiaWeb 2016 Alsodes valdiviensis <http://amphibiaweb.org/species/6428> University of California, Berkeley, CA, USA. Accessed Jan 19, 2020.
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Citation: AmphibiaWeb. 2020. <http://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 19 Jan 2020.
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