Plegma duponti (Morelet, 1866:62)



Taxonomy & Nomenclature

Synonym/s: "Helix Dupontie" Morelet, 1866; Nanina duponti Morelet, 1866; Nanina sulcifera


Conservation Status

Extinct (Griffiths & Florens, 2006; Régnier et al., 2009; Cowie et al., 2017)

Last record: subfossil; 1800's? (Griffiths & Florens, 2006; Régnier et al., 2009)


"Known only from subfossil sites, but one specimen collected in 1868 in reasonably good condition suggest taht (sic) the species probably survived well into the 19th century"

(Régnier et al., 2009)



Mauritius, Mascarene Islands


Biology & Ecology










Original scientific description:

Morelet, A. (1866). Colimacea in insula Mauritii de novo reperta. Revue et magasin de zoologie pure et appliquée. (sér. 2) 18: 62-63.

Other references:

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.

Griffiths, O. L. and Florens, V. F. B. (2006). A field guide to the non-marine molluscs of the Mascarene Islands (Mauritius, Rodrigues and Réunion) and the northern dependencies of Mauritius. Bioculture Press: Mauritius. Pp. i–xv, 1–185.

MolluscaBase eds. (2021). MolluscaBase. Plegma duponti (Morelet, 1866). Accessed at: on 2022-03-26

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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