^
abcdefAppleton C. C., Forbes A. T.& Demetriades N. T. (2009). "The occurrence, bionomics and potential impacts of the invasive freshwater snail Tarebia granifera (Lamarck, 1822) (Gastropoda: Thiaridae) in South Africa". Zoologische Mededelingen83.
http://www.zoologischemededelingen.nl/83/nr03/a04Archived 27 September 2017 at the
Wayback Machine
^Appleton C., Ghamizi M., Jørgensen A., Kristensen T. K., Stensgaard A-S. & Van Damme D. (2009).
Lymnaea natalensis. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.4. <www.iucnredlist.org>. Downloaded on 4 December 2010.
^Appleton C., Darwall W., Kaunda E., Kristensen T. K., Mailosi A. & Stensgaard A-S. (2009).
Lentorbis carringtoni. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.4. <www.iucnredlist.org>. Downloaded on 4 December 2010.
^van Bruggen A. C. & Appleton C. C. (1977). "Studies on the ecology and systematics of the terrestrial molluscs of the lake
Sibaya area of Zululand, South Africa". Zoologische Verhandelingen154: 3–48. pp. 21–23.
PDF.
^Herbert D. (2006). "Rediscovery of the type species of Euonyma (Subulinidae) and observations on South African species of Gulella (Streptaxidae), with description of two new species (Gastropoda: Eupulmonata)". Journal of Natural History40(17–18): 1063–1081.
doi:
10.1080/00222930600845218.
^
abcdefghijklmnopM. L. Cole & D. G. Herbert (2009). "Description of four new species of Gulella Pfeiff er, 1856 from Eastern Cape, South Africa, with additional notes on two poorly known species (Mollusca: Eupulmonata: Streptaxidae)".
Zool. Med. Leiden 83(6): 547-564.
^
abcdefghijklmnopM. L. Bursey & D. G. Herbert (2004). "Four new narrow-range endemic species of Gulella from Eastern Cape, South Africa (Mollusca: Pulmonata: Streptaxidae)".
African Invertebrates 45: 249-262.
^Herbert D. G. (2002). "Gulella salpinx sp. n., a new critical endangered holoendemic species from the limestone deposits of the Marble Delta, KwaZuluNatal, South Africa (Mollusca: Gastropoda: Streptaxidae)". African Invertebrates43: 125–138.
abstract.
^Breure B. (23 February 2008)
"The extended family". Bram's Snail Site, accessed 7 April 2011.
^
abcdefghijklmnopqrstuvwxDavid G. Herbert (2017). "A new genus and eight new species of tail-wagger snails from eastern South Africa, with a key to genera within Sheldonia s.l. (Gastropoda: Urocyclidae)".
European Journal of Taxonomy 309: 1-50.
Govender V. (2007). "Patterns of Distribution, Diversity and Endemism of Terrestrial Molluscs in South Africa". Thesis. School of Biological and Conservation Sciences,
University of KwaZulu-Natal. 219 pp.
PDF.
^
abcdefAppleton C. C., Forbes A. T.& Demetriades N. T. (2009). "The occurrence, bionomics and potential impacts of the invasive freshwater snail Tarebia granifera (Lamarck, 1822) (Gastropoda: Thiaridae) in South Africa". Zoologische Mededelingen83.
http://www.zoologischemededelingen.nl/83/nr03/a04Archived 27 September 2017 at the
Wayback Machine
^Appleton C., Ghamizi M., Jørgensen A., Kristensen T. K., Stensgaard A-S. & Van Damme D. (2009).
Lymnaea natalensis. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.4. <www.iucnredlist.org>. Downloaded on 4 December 2010.
^Appleton C., Darwall W., Kaunda E., Kristensen T. K., Mailosi A. & Stensgaard A-S. (2009).
Lentorbis carringtoni. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.4. <www.iucnredlist.org>. Downloaded on 4 December 2010.
^van Bruggen A. C. & Appleton C. C. (1977). "Studies on the ecology and systematics of the terrestrial molluscs of the lake
Sibaya area of Zululand, South Africa". Zoologische Verhandelingen154: 3–48. pp. 21–23.
PDF.
^Herbert D. (2006). "Rediscovery of the type species of Euonyma (Subulinidae) and observations on South African species of Gulella (Streptaxidae), with description of two new species (Gastropoda: Eupulmonata)". Journal of Natural History40(17–18): 1063–1081.
doi:
10.1080/00222930600845218.
^
abcdefghijklmnopM. L. Cole & D. G. Herbert (2009). "Description of four new species of Gulella Pfeiff er, 1856 from Eastern Cape, South Africa, with additional notes on two poorly known species (Mollusca: Eupulmonata: Streptaxidae)".
Zool. Med. Leiden 83(6): 547-564.
^
abcdefghijklmnopM. L. Bursey & D. G. Herbert (2004). "Four new narrow-range endemic species of Gulella from Eastern Cape, South Africa (Mollusca: Pulmonata: Streptaxidae)".
African Invertebrates 45: 249-262.
^Herbert D. G. (2002). "Gulella salpinx sp. n., a new critical endangered holoendemic species from the limestone deposits of the Marble Delta, KwaZuluNatal, South Africa (Mollusca: Gastropoda: Streptaxidae)". African Invertebrates43: 125–138.
abstract.
^Breure B. (23 February 2008)
"The extended family". Bram's Snail Site, accessed 7 April 2011.
^
abcdefghijklmnopqrstuvwxDavid G. Herbert (2017). "A new genus and eight new species of tail-wagger snails from eastern South Africa, with a key to genera within Sheldonia s.l. (Gastropoda: Urocyclidae)".
European Journal of Taxonomy 309: 1-50.
Govender V. (2007). "Patterns of Distribution, Diversity and Endemism of Terrestrial Molluscs in South Africa". Thesis. School of Biological and Conservation Sciences,
University of KwaZulu-Natal. 219 pp.
PDF.