Overview

Comprehensive Description

Description

Holotype: USNM 20418, collected by Dr. W.L. Abbott, Mahé, between April 1890 and August 1892.

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).

  • 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.
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Distribution

Distribution and Habitat

Seychelles Islands: Mahé, Silhouette, Praslin, La Digue, Frégate.

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.

  • 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.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:1
Specimens with Sequences:1
Specimens with Barcodes:1
Species:1
Species With Barcodes:1
Public Records:1
Public Species:1
Public BINs:1
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Barcode data

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Conservation

Life History, Abundance, Activity, and Special Behaviors

All species of Grandisonia are believed to be oviparous. G. alternans females are known to coil around egg clutches. This species also has a larval stage. These larvae have one pair of gill slits in line with the second nuchal groove and a small tail is present with one or two folds posterior to the anus.

Grandisonia alternans is the most abundant of the Grandisonia species and found in many different habitats on the large granitic Seychelles Islands.

  • 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.
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Threats

Life History, Abundance, Activity, and Special Behaviors

A permit is required for their collection. They are potentially endangered by habitat destruction.

  • 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.
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Wikipedia

Grandisonia

Grandisonia is a genus of amphibian in the Caeciliidae family.

Species

Binomial Name and AuthorCommon Name
Grandisonia alternans (Stejneger, 1893)Stejneger's Caecilian
Grandisonia brevis (Boulenger, 1911)Mahe Caecilian
Grandisonia larvata (Ahl, 1934)Indian Ocean Caecilian
Grandisonia sechellensis (Boulenger, 1911)Seychelles Caecilian

References

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