Poynton’s Forest Toad
Species Description: Menegon M, Salvidio S, Loader SP 2004 Five new species of Nectophrynoides Noble 1926 (Amphibia Anura Bufonidae) from the Eastern Arc Mountains, Tanzania. Trop. Zool. 17:97-121
Nectophrynoides poyntoni is similar in body shape and size to N. tornieri and to N. vestergaardi. However, in contrast to the expanded and truncate fingers and toes of N. tornieri, N. poyntoni has rounded toes. In addition, the two species can be easily differentiated by their advertisement calls. From N. vestergaardi, a species that also has rounded tips on its digits, the parotid gland shape, hind and forelimb ratios, and the dorsal pattern may all be used to discern these two species. From N. viviparous, the focal species can be differentiated by the latter lacking large glands on the limbs and being smaller in size. Nectophrynoides asperginis, N. laevis, N. pseudotornieri, N. wendyae and N. cryptus do not have an obvious tympanum, which makes them distinguishable from N. poyntoni. While the tympanum is occasionally visible in N. cryptus, the presence of a longer foot than tibia separates N. cryptus from N. poyntoni. The larger body size and pronounced bicolored parotid gland distinguishes N. poyntoni from N. minutus and N. frontierei (Menegon et al. 2004).
It is unclear if the coloration described by the species authority is in life or in preservative. The dorsal surface of the holotype specimen is primarily various shades of brown. Scattered, darker blotches are common. A black stripe is present from the tip of the snout to the end of the parotid glands. A light brown mid-dorsal stripe with a black outline is present. Beige coloration occurs on the sides of the head, the upper arms, and the dorsal surface in an upside-down “v” shaped marking, outlined in black. The dorsal glands have concentrations of melanophores on pale pink areas in the pattern of interrupted stripes. The ventral surface is gray with a few melanophores (Menegon et al. 2004).
The dorsal pattern varies between specimens. The coloration may be mostly shades of brown, or many darker/black blotches may be present on the dorsal surface of the head, body and legs. Dark, possibly interrupted, stripes may also run from the snout to the scapular parotoids or along the vertebral line (Menegon et al. 2004).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Tanzania, United Republic of
Life History, Abundance, Activity, and Special Behaviors
Nectophrynoides poyntoni is inferred to be an ovoviviparous or lecithotrophic species due to their small clutches of large, yolky eggs (Liedtke et al. 2014; Menegon et al. 2004). Menegon et al. (2004) reported clutch sizes of 8 and 10 large, yolky eggs in dissected specimens.
Menegon et al. (2004) describe the advertisement call of a male N. poyntoni. Males call near streams and vegetation in the late afternoon or after sunset. The monophasic call consists of high-pitched notes in a series of pulse trains. Each pulse lasts for 60 ms, and has a dominant frequency of 2.9 kHz and a second harmonic is emphasized at 8.7 kHz. The inter-pulse duration is 80 ms. A single pulse train has a duration of 1 s (6 - 8 pulses), and the interval between pulse trains is 2.5 - 3.5 s. The high frequency of the call may help distinguish the call from the noise of low frequency water turbulence.
Nectophrynoides poynton co-occurs withN. tornieri, which is similar in size and shape, but can differentiated based on toe-tip shape and advertisement call (Menegon et al. 2004).
Trends and Threats
Possible reasons for amphibian decline
General habitat alteration and loss
The species epithet “poyntoni” was named in honor of Professor John Poynton (Menegon et al. 2004)
Barratt, C., Tonelli, E., Menegon, M., Doggart, N., Bowkett, A., Harris, W.E., Howell, K., Ngalason, W., Loader, S. (2014). ''Fragmented habitats and species: The challenges of amphibian conservation in Tanzania today.'' FrogLog, 22(111), 63-64.
IUCN SSC Amphibian Specialist Group. (2015). Nectophrynoides poyntoni. The IUCN Red List of Threatened Species 2015: e.T54842A13323022. http://dx.doi.org/10.2305/IUCN.UK.2015-2.RLTS.T54842A13323022.en. Downloaded on 15 June 2016.
Liedtke, H.C., Müller, H., Hafner, J., Nagel, P., and Loader, S. (2014). ''Interspecific patterns for egg and clutch sizes of African Bufonidae (Amphibia: Anura).'' Zoologicher Anzeiger, 253(4), 309-315.
Menegon, M., Salvidio, S., and Loader, S. P. (2004). ''Five new species of Nectophrynoides Noble 1926 (Amphibia Anura Bufonidae) from the Eastern Arc Mountains, Tanzania.'' Tropical Zoology, 17, 97-121.
Written by Melissa Headley (mheadley AT rams.colostate.edu), Colorado State University
First submitted 2017-03-01
Edited by Ann T. Chang (2017-03-02)
Species Account Citation: AmphibiaWeb 2017 Nectophrynoides poyntoni: Poynton’s Forest Toad <http://amphibiaweb.org/species/6336> University of California, Berkeley, CA, USA. Accessed Jun 22, 2018.
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