Paratype: USNM 20404, collected by Prof. Léon Vaillant (may not be G. alternans).
Generally less than 330 mm in total length; total number of teeth not exceeding 50 in any dental series (8-9 premaxillary teeth, 13-17 maxillary teeth); choanae moderate, with visible valves; tongue with a pair of narial plugs; splenials present; secondaries numerous; tentacle farther from the eye than from the nostrils in transformed specimens, thus located near the border of the lip; snout projecting beyond the mouth; gill-slit present at dorsolateral point on the second nuchal groove; in the holotype, anterior part of head is yellowish-gray and the body is purplish-black above and below (modified from Taylor 1968).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Seychelles
Typically all Grandisonia species are fossorial and can be found under leaves, stones, decaying wood, and in wet soil. Known from sea-level to at least 750 m. Distribution is thought to be limited to the availability of moist habitat rather than elevation.
Life History, Abundance, Activity, and Special Behaviors
Grandisonia alternans is the most abundant of the Grandisonia species and found in many different habitats on the large granitic Seychelles Islands.
Trends and Threats
Possible reasons for amphibian decline
General habitat alteration and loss
Nussbaum, R. A. (1984). ''Amphibians of the Seychelles.'' Biogeography and Ecology of the Seychelles Islands. D.R. Stoddart , eds., Dr. W. Junk Publishers, Boston, 379-415.
Taylor, E.H. (1968). The Caecilians of the World. A Taxonomic Review. University of Kansas Press, Lawrence, Kansas.
Wake, M.H. (1977). ''The reproductive biology of caecilians: an evolutionary perspective.'' Reproductive Biology of Amphibians. D.H. Taylor and S.I. Guttman, eds., Plenum Press, New York., 73-101.
Originally submitted by: David C. Blackburn (first posted 2002-11-13)
Description by: Michelle S. Koo (updated 2021-03-17)
Distribution by: Michelle S. Koo (updated 2021-03-17)
Edited by: Meredith Mahoney (2021-03-17)
Species Account Citation: AmphibiaWeb 2021 Grandisonia alternans <https://amphibiaweb.org/species/1889> University of California, Berkeley, CA, USA. Accessed Jul 3, 2022.
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Citation: AmphibiaWeb. 2022. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 3 Jul 2022.
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