AMPHIBIAWEB
Ranitomeya sirensis
family: Dendrobatidae
subfamily: Dendrobatinae
 
Species Description: Schulte, R. 1999. Pfeilgiftfroesche.

© 2010 Brad Wilson (1 of 14)
Conservation Status (definitions)
IUCN (Red List) Status Endangered (EN)
CITES Appendix II
Other International Status None
National Status None
Regional Status None

 

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Description

Diagnosis: Ranitomeya sirensis is a very small Peruvian dendrobatid, reaching about 15-17 mm SVL (three adult males 14.7-15.4 mm, 1 adult female 16.8 mm SVL). It can be distinguished from all other dendrobatids by its uniform red dorsum and turquoise-green limbs. The venter is turquoise-green with a rectangular red patch on the belly, and the chin is red. Skin texture is slightly granular on the dorsum, while the venter is moderately granular, and limbs are smooth. The first finger is much shorter than second; all fingers have conspicuously enlarged finger discs at least twice finger width. The tympanum is visibly concealed posterodorsally. Neither teeth nor an omosternum are present.

Description: Male SVL measures 14.7-15.4 mm, and the single female specimen measured 16.8 mm in SVL. The head is narrower than the body. The snout is subtruncate when viewed dorsally, and sloping in lateral view. The canthus rostralis is rounded, while the loreal region is flat. The tympanum is vertically elliptical, but is hidden posterodorsally. Hands are relatively large, with all fingers except the first possessing considerably expanded discs (at least 2x finger width). The third finger is the longest, followed by the fourth, second, and first. A circular metacarpal tubercle lies at the base of the palm, and a smaller inner metacarpal tubercle is present at the base of the first finger. On the first, second and fourth fingers, there is one subarticular tubercle; in contrast, there are two on the third finger. All subarticular tubercles are inconspicuous with the exception of the distal subarticular tubercle on the third finger, which is distinctly raised. Hindlimbs are moderate in length, with the heel of the adpressed limb reaching the tympanum. The fourth toe is the longest, followed by the fifth, third, second and first. All toes except the first have expanded discs. The medium-sized inner and small outer metatarsal tubercle have rounded surfaces and are protuberant. Hands and feet lack webbing, supernumerary tubercles, and lateral fringe. The dorsal skin is slightly granular, while the venter is moderately granular and the limbs are smooth (Aichinger 1991).

The head and dorsum are red and lack spots or stripes. The arms and legs are turquoise. However the coloration is lighter on the anterodorsal side of the proximal half of the upper arm and on the proximal part of the thigh extending to the body. The venter is turquoise-green with a five by three mm red patch on the belly. The area below the rectangular patch and on the ventral surface of the legs are turquoise. The surface of the palms and soles are black. Iris is black (Aichinger 1991).

Similar species: Other small poison-dart frogs having a bright red dorsal coloration may be confused with this species. Ranitomeya sirensis differs from Oophaga speciosa, Andinobates opisthomelas, and Minyobates steyermarki by having turquoise-green limbs, from Oophaga granulifera in having only slightly granular skin, and from Oophaga pumilio by having a rectangular red patch on the turquoise-green venter (Aichinger 1991).

Distribution and Habitat

Country distribution from AmphibiaWeb's database: Peru

 

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Ranitomeya sirensis is endemic to the Cordillera El Sira, a single mountain in the Serranía de Sira mountain range in east-central Peru (departments of Huanuco, Pasco, and Ucayali) at elevations of 750-1000 m asl. It is found in (Stuart et al. 2008).

Life History, Abundance, Activity, and Special Behaviors
Like other dendrobatids, R. sirensis is diurnal (Aichinger 1991). R. sirensis may be arboreal due to its long hands and well-developed discs; it is presumed to use phytotelms for breeding (Aichinger 1991). It is oviparous; a female specimen was found to contain two mature eggs and three immature oocytes (Aichinger 1991). Individuals are quite agile and were observed to jump around "continuously" (Aichinger 1991). This species is sympatric over part of its elevational range with Adelphobates quinquevittatus, which occurs from 260 to 1080 m asl (Aichinger 1991).

Trends and Threats
It is thought to be rare, but population surveys have not been done for this species (Stuart et al. 2008). It was first collected in 1976 and again in 1987-1988 (Aichinger 1991), and most recently reported in 2007 (Von May et al. 2008). D. sirensis is found in one protected area, the Reserva Comunal El Sira (Stuart et al. 2008). However, this area is inhabited (it is an indigenous people's reserve) and habitat disturbance may be occurring due to farming and human settlement (Stuart et al. 2008). In the lower part of the range, selective logging is also taking place (Stuart et al. 2008). R. sirensis is an inhabitant of primary cloudforest and it is not known whether it has significant tolerance for disturbed habitat (Stuart et al. 2008).

Possible reasons for amphibian decline

General habitat alteration and loss
Habitat modification from deforestation, or logging related activities
Intensified agriculture or grazing

Comments
The species is named after the type locality, Serranía de Sira (Aichinger 1991). In 2011, the genus Dendrobates was subdivided into seven genera, including the new genus Ranitomeya by Brown et al (2011).

References

Aichinger, M. (1991). ''A new species of poison-dart frog (Anura:Dendrobatidae) from the Serrania de Sira, Peru.'' Herpetologica, 47, 1-5.

Brown J.L., Twomey E., Amézquita A., De Souza M.B., Caldwell J.P., Lötters S., Von May R., Melo-Sampaio P.R., Mejía-Vargas D., Perez-Peña P., Pepper M., Poelman E.H., Sanchez-Rodriguez M., and Summers K. (2011). ''A taxonomic revision of the Neotropical poison frog genus Ranitomeya (Amphibia: Dendrobatidae).'' Zootaxa, 3083, 1-120.

Stuart, S., Hoffmann, M., Chanson, J., Cox, N., Berridge, R., Ramani, P., and Young, B. (eds) (2008). Threatened Amphibians of the World. Lynx Edicions, IUCN, and Conservation International, Barcelona, Spain; Gland, Switzerland; and Arlington, Virginia, USA.

Von May, R., Catenazzi, A., Angulo, A., Brown, J. L., Carrillo, J., Chávez, G., Córdova, J. H., Curo, A., Delgado, A., Enciso, M. A., Gutiérrez, R., Lehr, E., Martinez, J. L., Medina-Müller, M., Miranda, A., Neira, D. R., Ochoa, J. A., Quiroz, A. J., Rodríguez, D. A., Rodríguez, L. O., Salas, A. W., and Seimon, T. (2008). ''Current state of conservation knowledge on threatened amphibian species in Peru.'' Tropical Conservation Science, 1(4), 376-396.



Written by Keith Lui and Kellie Whittaker (pdhkings AT berkeley.edu), UC Berkeley
First submitted 2010-09-30
Edited by Kellie Whittaker, Brent Nguyen (2011-11-07)

Species Account Citation: AmphibiaWeb 2011 Ranitomeya sirensis <http://amphibiaweb.org/species/6580> University of California, Berkeley, CA, USA. Accessed Oct 22, 2017.



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Citation: AmphibiaWeb. 2017. <http://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 22 Oct 2017.

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