Pachnodus velutinus Pfeiffer, 1868

Velutine pachnodus (proposed)



Taxonomy & Nomenclature

Synonym/s: Pachnodus velutinus Pfeiffer, 1841 (incorrect year)


Conservation Status


Last record: between 1972 and 1994

IUCN RedList status: Extinct


Hybridization with P. niger, following its expansion into P. velutinus habitat is believed to have caused the extinction of pure individuals of the latter species (Gerlach, 2009). No individuals have been recorded since before 1994. Yet a new preprint questions both the conservation status of the species (suggesting that the species is probably extant) and the cause of the decline (Altaba, 2022).



Mahé island, Seychelles


Biology & Ecology










Altaba, Cristian R. (2022). Extinction through Climate Change: Review of Evidence and Analysis of Two Land Snails from the Seychelles Islands. Preprints 2022100315 (

Cowie, Robert H., Régnier, Claire, Fontaine, Benoît, and Bouchet, Philippe. (2017). Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41.

Gerlach, Justin. (1994). New species of Pachnodus (Gastropoda: Enidae) from Seychelles. J. Conch. Lond. 35: 167-177.

Gerlach, Justin. (1996). Patterns of hybridization and extinction in a tropical land snail. Phelsuma 4: 27-38.

Gerlach, Justin. (2006). Terrestrial and Freshwater Mollusca of the Seychelles Islands. Backhuys, Leiden.

Gerlach, Justin. (2009a). Pachnodus velutinus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. ( Downloaded on 10 November 2012.

Gerlach, Justin. (2009b). Pachnodus velutinus. The IUCN Red List of Threatened Species 2009: e.T40091A10304648. Downloaded on 23 June 2021.

Gerlach, Justin. (2010). Climate change, species extinctions and ecosystem collapse. Phelsuma 17A: 13-31.

Gerlach, Justin. (2012). Red Listing reveals the true state of biodiversity: a comprehensive assessment of Seychelles biodiversity. Phelsuma 20: 9-22.

Gerlach, Justin, Matyot, Pat and Samways, Michael J. (2005). Developing strategies for invertebrate conservation: the case for the Seychelles islands. Phelsuma 13: 9-24.

Régnier, Claire, Fontaine, Benoît and Bouchet, Philippe. (2009). Not Knowing, Not Recording, Not Listing: Numerous Unnoticed Mollusk Extinctions. Conservation Biology 23(5): 1214-1221.


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