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Description

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A very large (30–40 mm) Afrixalus from the savannas of eastern and southern Africa; dark with broad light silverish dorsolateral bands from tip of snout to anus. The bands meet posteriorly, not anteriorly. About half the specimens in northern populations (Tanzania and Kenya) have the entire dorsum silverish white. Upper side of tibia white. The males have numerous large conspicuous black-tipped asperities on head, back, dorsal surfaces of limbs and around the anus. The females have smaller asperities. Pickersgill (1996) regard the populations where the uniform-backed specimens occur as a separate species, Afrixalus unicolor (Boettger 1913), without arguing for its specific distinctness. Drewes & Altig (1996) have reported that A. fornasini preys on eggs and developing larvae of other frogs (Chiromantis xerampelina, Hyperolius sp. and A. fornasini). Voice. – A typical Afrixalus sound, but loud, slow and low-pitched as can be expected from such a large animal. The voice has been compared with the stuttering of a minute machine-gun by Wager. There is a slow, creaking initial sound followed by a series of figures at a rate of 5–10 per second and with a frequency-intensity maximum at about 2500 cps.

References

  • Drewes, R.C. and Altig, R. (1996). ''Anuran egg predation and heterocanibalism in a breeding community of East African frogs.'' Tropical Zoology, 9(2), 333-347.
  • Pickersgill, M. (1996). ''The status of Afrixalus unicolor.'' Journal of the International Herpetological Society, (83), 91-94.
  • Steward, M. M. and Wilson, V. J. (1966). ''Herpetofauna of the Nyika plateau (Malawi and Zambia).'' Annals of the Natal Government Museum, (18), 287-314.

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Distribution and Habitat

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Afrixalus fornasinii is a characteristic element in the savanna, possibly preferring rather dense savanna with larger bushes and trees. It is found in the coastal lowlands, but also on localities up to 1300 metres in Malawi (Stewart 1967). To the south it is again confined to the coastal tropical lowlands of South Africa.
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Life History, Abundance, Activity, and Special Behaviors

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Development. – The eggs are glued in a leaf, the tadpoles are large, up to 65 mm (17+48) and streamlined with a terminal mouth. Tooth formula 0/1.
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Afrixalus fornasini

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Wikimedia Commons has media related to Afrixalus fornasini.

Afrixalus fornasini is a species of frog in the family Hyperoliidae and is native to Africa. Its common name is Fornasini's spiny reed frog[2] or the greater leaf-folding frog[3]

The specific epithet fornasini is in honour of Italian amateur naturalist Carlo Antonio Fornasini, who collected the type specimen.[4]

Distribution and habitat

It is found in Kenya, Tanzania, Malawi, Mozambique, Zimbabwe, South Africa and possibly Eswatini. Its natural habitats are temperate forest, subtropical or tropical dry forest, dry savanna, moist savanna, temperate shrubland, subtropical or tropical moist shrubland, temperate grassland, subtropical or tropical seasonally wet or flooded lowland grassland, swamps, freshwater marshes, intermittent freshwater marshes, water storage areas, and ponds.

Conservation status

The species is threatened in some parts of its range by habitat loss, but in general it is not very rare, and in some places common.[1]

Diet

Both male and female Afrixalus fornasinii adults prey on grey foam-nest tree frog eggs and tadpoles. This species is the first African anuran to demonstrate hetero-cannibalism by preying on eggs belonging to the same family.[5]

Evidence for natural selection

The camouflage mechanism used by the species provided compelling[6] evidence for evolution by natural selection. The zoologist Hugh Cott's drawings and description of the frog's "coincident disruptive coloration" showed that its pattern, forming bold stripes on the legs and body, lined up (coincided) exactly when the legs were tightly folded into the body at rest, effectively disrupting its outline. The zoologists I. C. Cuthill and A. Székely noted that the way the configuration works indicates that it must have survival value, implying natural selection at work.[6]

Gallery

Notes

  1. ^ a b IUCN SSC Amphibian Specialist Group (2013). "Afrixalus fornasini". IUCN Red List of Threatened Species. 2013: e.T56063A3034378. doi:10.2305/IUCN.UK.2013-2.RLTS.T56063A3034378.en. Retrieved 14 November 2021.
  2. ^ AmphibiaWeb
  3. ^ Carruthers, V. (2001). First Field Guide to Frogs of Southern Africa. ISBN 978-1-86872-595-3.
  4. ^ Bianconi, G. Giuseppe (26 April 1849). "Alcune nuove specie di rettili del Mozambico". Nuovi Annali delle Scienze Naturali. 2 (in Italian). Bologna. 10: 106.
  5. ^ Drewes, R. C.; Altig, R. (1996-11-01). "Anuran egg predation and heterocannibalism in a breeding community of East African frogs". Tropical Zoology. 9 (2): 333–347. doi:10.1080/03946975.1996.10539316. ISSN 0394-6975.
  6. ^ a b Cuthill, I. C.; Székely, A. (2011). Stevens, Martin; Merilaita, Sami (eds.). Animal Camouflage: Mechanisms and Function. Cambridge University Press. p. 50. ISBN 978-1-139-49623-0.
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Afrixalus fornasini: Brief Summary

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Wikimedia Commons has media related to Afrixalus fornasini.

Afrixalus fornasini is a species of frog in the family Hyperoliidae and is native to Africa. Its common name is Fornasini's spiny reed frog or the greater leaf-folding frog

The specific epithet fornasini is in honour of Italian amateur naturalist Carlo Antonio Fornasini, who collected the type specimen.

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