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Herbert, D.G. 2002. Gulella salpinx sp. n. a new, Critically Endangered, holoendemic species from the limestone deposits of the Marble Delta, KwaZulu-Natal, South Africa (Mollusca: Gastropoda: Streptaxidae). African Invertebrates 43: 125–138. IUCN. 2004. 2004 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 23 November 2004. |
| Citation: | Herbert, D.G. 2004. Gulella salpinx. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 21 May 2013. |
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