Island Biodiversity
Seychelles biodiversity
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Biodiversity of the Seychelles islands

The Republic of Seychelles comprises 115 islands located within the Madagascar region biodiversity hotspot. Levels of biodiversity are known to be high, with the most recent overview estimating the presence of 850 plants and 2,426 insect species, although noting that for at least some islands insect diversity may be 3 times higher than the available estimates. These estimates were largely based on collections made on 32 islands by the Percy Sladen Trust Expeditions of 1905 and 1908-9. In 2000 the Indian Ocean Biodiversity Assessment 2000-2005 (IOBA) was initiated to complete and update the collections made by the Percy Sladen Trust Expedition 100 years earlier. This has now resulted in extensive collections of all multicellular terrestrial and freshwater taxa throughout the islands. These collections are currently being identified, currently available data place diversity of the islands at 5,381 species (1,139 plants, 12 algae, 70 fungi, 250 lichens, 3,775 invertebrates, 135 vertebrates).
Taxon   Number of species
Plants Bryophyta 200
  Pteridophyta 85
  Angiospermae 854
Algae   12
Fungi & lichens   320
Animals Platyhelminthes 7
  Annelida 16
  Nemertea 1
  Nematoda 50
  Rotifera 15
  Mollusca 75
  Tardigrada 34
  Insecta 3067
  Crustacea 77
  Myriapoda 71
  Chelicerata 362
  Vertebrata 135

More details are given on some groups of species on the following pages:

  • Plants
  • Invertebrates
  • Amphibians and reptiles
  • Bats
  • Birds