|Scientific Name:||Chelonoidis duncanensis (Garman in Pritchard, 1996)|
Chelonoidis nigra ssp. duncanensis (Pritchard, 1996)
Geochelone elephantopus ssp. ephippium (Günther, 1875)
Geochelone nigra ssp. duncanensis Pritchard, 1996
Geochelone nigra ssp. ephippium (Günther, 1875)
Testudo elephantopus ssp. ephippium (Günther, 1875)
Testudo ephippium Günther, 1875
|Taxonomic Source(s):||TTWG [Turtle Taxonomy Working Group: van Dijk, P.P., Iverson, J.B., Rhodin, A.G.J., Shaffer, H.B. and Bour, R.]. 2014. Turtles of the world, 7th edition: annotated checklist of taxonomy, synonymy, distribution with maps, and conservation status. Chelonian Research Monographs 5(7): 000.329-479, doi:10.3854/crm.5.000.checklist.v7.2014.|
|Taxonomic Notes:||The previous Red List assessments for Galapagos tortoises treated the various allopatric island populations as subspecies of Chelonoidis nigra, as did several authors (Pritchard 1996; Caccone et al. 1999; Beheregaray et al. 2003; Fritz and Havas 2007; TTWG 2007, Rhodin et al. 2008). However, other authors have considered them as full species based on morphology (Bour 1980; Fritts 1983; Ernst and Barbour 1989) and more recently several researchers (Cacconeet al. 2002; Russello et al. 2005, 2007; Poulakakis et al. 2008, 2012, 2015; Chiari et al. 2009) have treated most of them as full species based on congruent patterns of mitochondrial and nuclear variation. This elevated species-level taxonomy has been largely accepted by TTWG (2009, 2014) and TEWG (2015) for most, but not all, phylogenetic lineages of Galapagos tortoises. This Red List assessment therefore now treats C. duncanensis as a full species, rather than retaining its previous subspecies ranking from earlier Red List assessments.
This taxon appeared on the IUCN Red Lists before 2007 under the name Geochelone nigra ephippium.
This is an amended assessment to accommodate the change in taxonomy as described above. The amended assessment includes all the references cited above even though most of them post-date the actual date of assessment.
|Red List Category & Criteria:||Extinct in the Wild ver 2.3|
|Assessor(s):||Tortoise & Freshwater Turtle Specialist Group|
|Previously published Red List assessments:|
Regionally extinct:Ecuador (Galápagos)
|Range Map:||Click here to open the map viewer and explore range.|
|Citation:||Tortoise & Freshwater Turtle Specialist Group. 2016. Chelonoidis duncanensis. The IUCN Red List of Threatened Species 2016: e.T9021A97226429.Downloaded on 24 November 2017.|
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