Hemiphractus proboscideus (Jiménez de la Espada, 1870)
Sumaco Horned Treefrog
© 2015 Dr. Peter Janzen (1 of 9)
Embryos in the subfamily Hemiphractinae (marsupial frogs) are characterized by unique, membranous bell-shaped gills (Noble 1927; del Pino and Escobar 1981). These gills are derived from the branchial arches (Noble 1927; del Pino and Escobar 1981) and allow respiration during development in the egg (Mendelson et al., 2000). Hemiphractus proboscideus is a direct developer, and does not have a free-living larval stage (Trueb 1974; del Pino and Escobar 1981).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Colombia, Ecuador, Peru
Life History, Abundance, Activity, and Special Behaviors
Frogs in the subfamily Hemiphractinae, including those in the genus Hemiphractus, are known as marsupial frogs. Hemiphractus proboscideus is considered one of the basal members of this genus since the female incubates the eggs on her back but lacks a brooding pouch for doing so. During the mating season, the female carries up to 26 large eggs exposed on her back, adhered by gelatinous substances. This species has direct development where small froglets hatch directly out of the eggs, without going through a free-living larval stage (Trueb 1974; del Pino and Escobar 1981).
The adult diet consists of other frogs as well as small lizards and large arthropods (Duellman 2003), constituting relatively large and resistant prey (Fabrezi and Emerson 2003). Hemiphractus proboscideus has large "fangs" on the bottom jaw, which have most likely evolved in the context of dietary specialization rather than sexual selection, since fang size is not sexually dimorphic in this species (Fabrezi and Emerson 2003).
When defending itself, Hemiphractus proboscideus will open the mouth to show a bright yellow tongue (Duellman 2003).
Trends and Threats
Possible reasons for amphibian decline
General habitat alteration and loss
Bartlett, R. D. and Bartlett, P. (2003). Reptiles and Amphibians of the Amazon. University Press of Florida, Gainesville.
Duellman, W. E. (1978). ''The biology of an equatorial herpetofauna in Amazonian Ecuador.'' Miscellaneous Publications of the University of Kansas Museum of Natural History, 65, 1-352.
Duellman, W. E. (2003). ''Sumaco horned treefrog, Hemiphractus proboscideus.'' Grzimek's Animal Life Encyclopedia, Volume 6, Amphibians. 2nd edition. M. Hutchins, W. E. Duellman, and N. Schlager, eds., Gale Group, Farmington Hills, Michigan.
Fabrezi, M. and Emerson, S. B. (2003). ''Parallelism and convergence in anuran fangs.'' Journal of Zoology (London), 260, 41-51.
Mendelson, J. R. III, Da Silva, H. R., and Maglia, A. M. (2000). ''Phylogenetic relationships among marsupial frog genera (Anura: Hylidae: Hemiphractinae) based on evidence from morphology and natural history.'' Zoological Journal of the Linnaean Society, 128, 125-148.
Noble, G. K. (1927). ''The value of life history data in the study of the evolution of the Amphibia.'' Annals of the New York Academy of Sciences, 30, 31-128.
Shaw, J. P. and Ellis, S. A. (1989). ''A scanning electron microscope study of the odontoids and teeth in Hemiphractus proboscideus (Anura:Hylidae).'' Journal of Zoology (London), 219, 533-544.
Sheil, C. A., Mendelson, J. R., III, and Da Silva, H. R. (2001). ''Phylogenetic relationships of the species of neotropical horned frogs, genus Hemiphractus (Anura: Hylidae: Hemiphractinae), based on evidence from morphology.'' Herpetologica, 57, 203-214.
Stuart, S., Hoffmann, M., Chanson, J., Cox, N., Berridge, R., Ramani, P., Young, B. (eds) (2008). Threatened Amphibians of the World. Lynx Edicions, IUCN, and Conservation International, Barcelona, Spain; Gland, Switzerland; and Arlington, Virginia, USA.
Trueb, L. (1973). ''Bones, frogs and evolution.'' Evolutionary Biology of the Anurans: Contemporary Research on Major Problems. J. L. Vial, eds., University of Missouri Press, Columbia, Missouri, 65-132.
Trueb, L. (1974). ''Systematic relationships of neotropical horned frogs, genus Hemiphractus (Anura, Hylidae).'' Occasional Papers of the Museum of Natural History of the University of Kansas, 29, 1-60.
del Pino, E. M. and Escobar, B. (1981). ''Embryonic stages of Gastrotheca riobambae (Fowler) during maternal incubation and comparison with development of other marsupial frogs.'' Journal of Morphology, 167, 277-295.
Originally submitted by: Kellie Whittaker, Peera Chantasirivisal (first posted 2006-02-09)
Edited by: Kellie Whittaker (2009-04-01)
Species Account Citation: AmphibiaWeb 2009 Hemiphractus proboscideus: Sumaco Horned Treefrog <https://amphibiaweb.org/species/1411> University of California, Berkeley, CA, USA. Accessed Sep 28, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 28 Sep 2023.
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