Revision of Dadagulella gen. nov., the “Gulella radius group" (Gastropoda: Streptaxidae) of the eastern Afrotropics, including six new species and three new subspecies

Ben Rowson, Peter Tattersfield

Abstract


The genus Dadagulella gen. nov. is described to include 16 species of small, dentate, ovate-acuminate Afrotropical snails. An identification key is provided and biogeography, anatomy and systematics are discussed. The type species is the Kenyan D. radius (Preston, 1910) comb. nov., whose name has informally been used for part of the group in the past. Substantial intraspecific variation occurs in three species: D. radius itself, D. browni (van Bruggen, 1969) comb. nov. and D. minuscula (Morelet, 1877) comb. nov. (= Ennea fischeriana Morelet, 1881) (non Gulella minuscula Emberton & Pearce, 2000) . We recognise subspecies within each of these: D.radius radius (Preston, 1910) comb. nov., D. r. calva (Connolly, 1922) comb. et stat. nov., D. browni browni (van Bruggen, 1969) comb. nov., D. b. mafiensis subsp. nov., D. b. semulikiensis subsp. nov., D. minuscula minuscula (Morelet, 1877) comb. nov., D. m. mahorana subsp. nov. Six new Tanzanian species are described: D. cresswelli sp. nov., D. delta sp. nov., D. ecclesiola sp. nov., D. frontierarum sp. nov., D. minareta sp. nov., and D. pembensis sp. nov. The genus includes seven other previously described species: D. cuspidata (Verdcourt, 1962) comb. nov.; D. rondoensis (Verdcourt, 1994) comb. nov.; D. conoidea (Verdcourt, 1996) comb. nov.; D. selene (van Bruggen & Van Goethem, 1999) comb. nov.; D. meredithae (van Bruggen, 2000) comb. nov.; D. nictitans (Rowson & Lange, 2007) comb. nov.; and D. delgada (Muratov, 2010) comb. nov.


Keywords


Mollusca; Africa; Eastern Arc Mountains; Albertine Rift; biogeography

Full Text:

PDF PDF/A


DOI: https://doi.org/10.5852/ejt.2013.37

References


Adam W., van Bruggen A.C. & Van Goethem J.L. 1995. Etudes sur les mollusques terrestres de l’Afrique, à partir des notes de feu le Dr. William Adam. 3. Ptychotrema (Ptychotrema s.s., Adjua, Excisa, Mirellia, Nsendwea, Ptychoon, Sphinctostrema) (Gastropoda Pulmonata: Streptaxidae). Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, Biologie 65: 89-115.

Aiken D.W. 1981. Differentiation of the radula of South African species of Gulella into three types. Journal of Conchology 30 (5): 317-324.

Bruggen A.C. van 1969. Studies on the land molluscs of Zululand, with notes on the distribution of land molluscs in Southern Africa. Zoologische Verhandelingen 103: 3-116.

Bruggen A.C. van 1975. Streptaxidae (Mollusca, Gastropoda: Pulmonata) from Aldabra Island, Western Indian Ocean. Bulletin of the British Museum (Natural History) Zoology 28: 157-175.

Bruggen A.C. van 1986. Additional notes on Gulella (Gastropoda Pulmonata: Streptaxidae) from the Aldabra group, western Indian Ocean. Basteria 50: 71-77.

Bruggen A.C. van. 2000. Studies on the Streptaxidae (Mollusca: Gastropoda Pulmonata) of Malaŵi. 5. Description of Gulella meredithae spec. nov. Zoologische Mededelingen 74 (15): 225-235.

Bruggen A.C. van 2003. Gulella udzungwensis spec. nov. (Gastropoda, Pulmonata, Streptaxidae), a new species from the Udzungwa Mountains in Tanzania. Basteria 67 (1-3): 87-90.

Bruggen A.C. van & Appleton C.C. 1977. Studies on the ecology and systematics of the terrestrial molluscs of the Lake Sibaya area of Zululand, South Africa. Zoologische Verhandelingen 154: 3-44, pls. 1-4.

Bruggen A.C. van & Meredith H.M. 1984. A preliminary analysis of the land molluscs of Malaŵi. In: Solem A. & Bruggen A.C. van (eds) World-wide Snails: Biogeographical Studies on non-marine Mollusca: 156-171. Backhuys, Leiden, the Netherlands.

Bruggen A.C. van & Van Goethem J.L. 1999. Dr. William Adam’s iconography of Central and West African Gulella species (Gastropoda Pulmonata: Streptaxidae). Part 3: Nine new species from the D.R. Congo. Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, Biologie 69: 31-45.

Connolly M. 1922. Notes on African Non-marine Mollusca, with Descriptions of Many New Species. Annals and Magazine of Natural History Series 9 10 (59): 485-517, pl. XIV. http://dx.doi.org/10.1080/00222932208632797

Connolly M. 1930. Descriptions of new molluscs from Central Africa, with notes on other species. Proceedings of the Malacological Society of London 19: 37-48.

Degner E. 1934. Westafrikanische Landschnecken. I. Streptaxiden, Helicarioniden, Vaginuliden. Zoologische Jahrbücher 65: 14-308.

Emberton K.C. 2001. Dentate Gulella of Madagascar (Pulmonata: Streptaxidae). American Malacological Bulletin 16: 71-129.

Emberton K.C. & Pearce T.A. 2000. Small, High-Spired Pulmonates from Mounts Mahermana, Ilapiry, and Vasiha, Southeastern Madagascar, with Description of a New Genus, and with Conservation Statuses of 15 Streptaxid Species. The Veliger 43 (2): 126-153.

Fischer-Piette E. & Vukadinovic D. 1974. Les Mollusques Terrestres des Iles Comores. Mémoires du Muséum National d’Histoire Naturelle (Nouvelle Série: Série A, Zoologie) 84, Muséum national d’Histoire naturelle, Paris.

Griffiths O.L. & 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.

Herbert D. & Kilburn D. 2004. Field guide to the land snails and slugs of eastern South Africa. Natal Museum, Pietermaritzburg.

Herbert D.G. & Rowson B. 2011. Pupa menkeana Pfeiffer, 1853, type species of the speciose land snail genus Gulella Pfeiffer, 1856: correction of longstanding misidentification and designation of neotype (Mollusca: Eupulmonata: Streptaxidae). African Invertebrates 52 (2): 233-242.

Kobelt W. 1905. Die Raublungenschnecken (Agnatha). Zweite Abtheilung. Streptaxidae und Daudebardiidae. In: Martini & Chemnitz (eds) Systematisches Conchylien-Cabinet I. 12B (2): 1-211. Bauer und Raspe, Nürnberg.

Kobelt W. 1910. Katalog der lebenden schalentragenden Mollusken der Abteilung Agnatha. Jahrbücher des Nassauischen Vereins für Naturkunde 63: 138-196.

Lange C.N. & Mwinzi M. 2003. Snail diversity, abundance and distribution in Arabuko Sokoke forest, Kenya. African Journal of Ecology. 41 (1): 61-67. http://dx.doi.org/10.1046/j.1365-2028.2003.00412.x

Morelet A. 1877. Excursion conchyliologique dans i’île d’Anjouan (Johanna). Journal de Conchyliologie 25: 325-347.

Morelet A. 1881. Malacologie des Comores. Récolte de M. Marie à l’île Mayotte. Journal de Conchyliologie 29: 212-240.

Muratov I.V. 1999. Analysis of the phylogenetic relationships and their systematic implications in the Limacoinei (Zonitinia) infraorder (Gastropoda, Pulmonata, Geophila). Ruthenica 9 (1): 5-26.

Muratov I.V. 2010. Terrestrial molluscs of Cabo Delgado and adjacent inland areas of north-eastern Mozambique. African Invertebrates 51 (2): 255-288. http://dx.doi.org/10.5733/afin.051.0203

Ndalila M. 2011. Land snails of Shimba Hills National Reserve: their distribution, diversity and some aspects of ecology. Lambert Academic Publishing, Saarbrücken.

Pickford M. 2009. Land Snails from the Early Miocene Legetet Formation, Koru, Kenya. Geo-Pal Kenya 2: 1-88.

Preston H.B. 1910. Additions to the non-Marine Molluscan Fauna of British and German East Africa and Lake Albert Edward. Annals and Magazine of Natural History, Series 8 6: 526-536. http://dx.doi.org/10.1080/00222931008692885

Rasband W.S. 1997-2011. ImageJ, U.S. National Institutes of Health, Bethesda, Maryland, USA [online]. Available from http://imagej.nih.gov/ij/. [accessed 30 Mar. 2012]

Richardson C.L. 1988. Streptaxacea: catalog of species. Part I: Streptaxidae. Tryonia 16, Department of Malacology, Academy of Natural Sciences of Philadelphia, Philadelphia.

Rowson B. 2007a. Land molluscs of Zanzibar Island (Unguja), Tanzania, including a new species of Gulella (Pulmonata: Streptaxidae). Journal of Conchology 39 (4): 425-466.

Rowson B. 2007b. Gulella (Juventigulella) ngerezae spec. nov. (Gastropoda, Pulmonata, Streptaxidae), a new endemic land snail from the Ukaguru Mountains, Tanzania. Basteria 71 (4-6): 221-228.

Rowson B. & Lange C.N. 2007. Two new species of Gulella (Mollusca: Pulmonata: Streptaxidae) from the Taita Hills, Kenya. African Invertebrates 48 (2): 21-32.

Rowson B., Tattersfield P. & Symondson W.O.C. 2010a. Phylogeny and biogeography of tropical carnivorous land-snails (Pulmonata: Streptaxoidea) with particular reference to East Africa and the Indian Ocean. Zoologica Scripta 40: 85-98. http://dx.doi.org/10.1111/j.1463-6409.2010.00456.x

Rowson B., Warren B.H. & Ngereza C.F. 2010b. Terrestrial molluscs of Pemba Island, Zanzibar, Tanzania, and its status as an “oceanic” island. ZooKeys 70: 1-39. http://dx.doi.org/10.3897/zookeys.70.762

Schileyko A.A. 2000. Treatise on Recent terrestrial pulmonate molluscs. Part 6: Rhytididae, Chlamydephoridae, Systrophiidae, Haplotrematidae, Streptaxidae, Spiraxidae, Oleacinidae, Testacellidae. Ruthenica Supplement 2, Moscow.

Schileyko A.A. 2003. Treatise on Recent terrestrial pulmonate molluscs. Part 11: Trigonochlamydidae, Papillodermidae, Vitrinidae, Limacidae, Bielziidae, Agriolimacidae, Boettgerillidae, Camaenidae. Ruthenica Supplement 2, Moscow.

Tattersfield P. 1998a. Patterns of diversity and endemism in East African land snails, and the implications for conservation. In: Killeen I.J., Seddon M.B. & Holmes A.M. (eds) Molluscan Conservation: A strategy for the 21st. Century: 77-86. Journal of Conchology Special Publication 2, The Conchological Society of Great Britain and Ireland.

Tattersfield P. 1998b. Three new species and a new subgenus of Gulella (Gastropoda: Streptaxidae) from Tanzania. Journal of Conchology 36 (2): 31-41.

Tattersfield P., Seddon M.B., Meena C., Kayumbo N. & Kasigwa P. 1998. Ecology and conservation of the land-snails of the Eastern Arc Mountains. Journal of East African Natural History 87 (1): 119-138. http://dx.doi.org/10.2982/0012-8317(1998)87[119:EACOTL]2.0.CO;2

Tattersfield P., Seddon M.B., Ngereza C. & Rowson B. 2006. Elevational variation in diversity and composition of land-snail faunas in a Tanzanian forest. African Journal of Ecology 44: 47-60. http://dx.doi.org/10.1111/j.1365-2028.2006.00612.x

Tryon G.W. 1885. Testacellidae, Oleacinidae, Streptaxidae, Helicoidea, Vitrinidae, Limacidae, Arionidae. Manual of Conchology: Structrual and Systematic, with Illustrations of the Species. Second Series: Pulmonata 1, Tyron G.W., Philadelphia.

Verdcourt B. 1953. Notes on some East African Gulellae. Basteria 17: 36-42.

Verdcourt B. 1962. Preliminary Keys for the Identification of the Species of the Genus Gulella Pfr. Occurring in East Africa. Annales du Musée Royal de l’Afrique Centrale 106, Musée Royal de l’Afrique Centrale, Tervuren.

Verdcourt B. 1963. The Miocene non-marine mollusca of Rusinga Island, Lake Victoria and other localities in Kenya. Palaeontographica Abt. A 121 (1-3): 1-37.

Verdcourt B. 1983. A list of the non-marine Mollusca of East Africa (Kenya, Uganda, Tanzania, excluding Lake Malawi). Achatina 11: 200-239.

Verdcourt B. 1985. New taxa of Gulella L. Pfr. And Ptychotrema Mörch (Mollusca, Streptaxidae) from Eastern Africa. Journal of Conchology 32 (2): 109-121.

Verdcourt B. 1990. Two Ethiopian streptaxids (Gastropoda: Pulmonata: Streptaxidae). Journal of Conchology 33 (6): 345-354.

Verdcourt B. 1994. A new species of Gulella from SE. Tanzania (Pulmonata: Streptaxidae). Archiv für Molluskenkunde 123 (1/6): 137-139.

Verdcourt B. 1996. A new species of Gulella Pfr. (Gastropoda Pulmonata, Streptaxidae) from NE. Tanzania. Basteria 59 (4-6): 135-137.

Verdcourt B. 2000. Molluscs. In: Burgess N.D. & Clarke G.P. (eds) Coastal Forests of Eastern Africa: 219-224. IUCN, Gland, Switzerland.

Verdcourt B. 2006. A Revised List of the Non-marine Mollusca of East Africa (Kenya, Tanzania and Uganda, excluding Lake Malawi). Verdcourt B., Maidenhead, UK.

Winter A.J. de 2008. Costigulella primennilus spec. nov., a new minute western African terrestrial snail, with remarks on the genus Costigulella (Gastropoda Pulmonata: Streptaxidae). Zoologische Mededelingen 82 (23): 245-251.

Winter A.J. de, Gomez B.J. & Prieto C.E. 1999. Sinistrexcisa, a new genus of land snail from Central West Africa with four new species (Gastropoda: Pulmonata: Streptaxidae). Journal of Molluscan Studies 65 (2): 209-221. http://dx.doi.org/10.1093/mollus/65.2.209

Wronski T. & Hausdorf B. 2010. Diversity and body-size patterns of land snails in rain forests in Uganda. Journal of Molluscan Studies 76 (1): 87-100. http://dx.doi.org/10.1093/mollus/eyp048


Refbacks

  • There are currently no refbacks.


License URL: https://creativecommons.org/licenses/by/3.0/