Hyloscirtus larinopygion (Duellman, 1973)
© 2009 Victor Fabio Luna (1 of 2)
Female holotype measured 53.6 mm SVL. This species can be diagnosed by the following combination of characters: (1) dorsum uniform brown in coloration; (2) flanks and hidden surfaces of thighs gray with black vertical bars; (3) ventral region cream with black blotches; (4) cloacal region quite swollen, bordered by a transverse dermal fold; (5) fingers with basal webbing; (6) toes about 1/2 webbed (Duellman 1973).
Other characters include: head the same width as body; snout truncate in both dorsal and lateral view; nares closer to tip of snout and not protuberant; internarial area flat; canthus rounded; loreal region somewhat concave; lips rounded and thick; eyes somewhat large but not protuberant; top of head flattened; prominent supratympanic fold, obscuring dorsal edge of tympanum; tympanic annulus visible. Forearm robust; low, scalloped ulnar fold and distinct wrist fold present; axillary membrane is lacking; fingers are long and basally webbed, with the tips expanded into small discs; Finger III disc is equal in width to the tympanum; subarticular tubercles are large and flattened; supernumerary tubercles are present on proximal segments of fingers; palmar tubercle bifid, low; prepollex enlarged and oval-shaped. Hind limbs slender; inner metatarsal tubercle flattened and elliptical; toes are elongated, one-third webbed, and have discs smaller than fingers; subarticular tubercles are round and large; supernumerary tubercles are round, small and present on proximal segments of toes. Cloaca has transverse dermal fold above it and is encircled by a swollen glandular region with a cleft running from the opening to the ventral surfaces of the thighs. Skin is smooth dorsally; weakly granular on chest, belly, and proximal posteroventral thigh surfaces. Tongue round; prevomerine teeth number 11-13 (Duellman 1973).
In life, this frog has a solid brown dorsum, while the flanks and concealed surfaces of the limbs are blue with black bars. The venter has black and blue marbling. The iris is silver with black reticulations. Juveniles are grayish brown with faint darker markings; in juveniles the thighs show narrow transverse brown bands, the flanks are cream with tiny brown spots, and the venter and concealed surfaces of the thighs are cream-colored (Duellman 1973).
This species resembles H. calcarata, H. fasciata, and H. raniceps in having vertical black bars on the flanks and hidden surfaces of the thighs, but H. larinopygion has a distinctive swollen cloacal region as well as ventral patterning, in contrast to the white venters of these three species (Duellman 1973).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Colombia, Ecuador
Life History, Abundance, Activity, and Special Behaviors
Trends and Threats
Possible reasons for amphibian decline
Habitat modification from deforestation, or logging related activities
Duellman, W. E. (1973). ''Descriptions of new hylid frogs from Colombia and Ecuador.'' Herpetologica, 29, 219-227.
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.
Originally submitted by: Kellie Whittaker (first posted 2010-01-02)
Edited by: Kellie Whittaker (2010-01-05)
Species Account Citation: AmphibiaWeb 2010 Hyloscirtus larinopygion <https://amphibiaweb.org/species/842> University of California, Berkeley, CA, USA. Accessed Mar 23, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 23 Mar 2023.
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