Topic
Seychellum
About: Seychellum is a research topic. Over the lifetime, 4 publications have been published within this topic receiving 114 citations.
Papers
TL;DR: Cumberlidge et al. as mentioned in this paper assigned 19 genera from sub-Saharan Africa to the Potamonautidae Bott, and classified them into two sub-families: Potamonautes Bott, 1970 and Deckeniinae, 1869.
Abstract: The family Potamonautidae Bott, 1970, currently comprises 19 genera assigned to two subfamilies (Potamonautinae Bott, 1970, and Deckeniinae Hilgendorf, 1869) based on morphological and molecular studies (Cumberlidge 1999; Daniels et al . 2006a, 2015; Cumberlidge et al . 2008; Cumberlidge & Ng 2009). All members of this family are endemic to the Afrotropical zoogeographical region that includes most of continental Africa plus the continental islands of Madagascar, the granitic Seychelles, Socotra, and the southern Arabian Peninsula. Seven genera from sub-Saharan Africa are presently assigned to Potamonautinae (see Cumberlidge et al . 2008; Daniels et al . 2015): Erimetopus Rathbun, 1894, Liberonautes Bott, 1955, Louisea Cumberlidge, 1994, Potamonautes Bott, 1970, Potamonemus Cumberlidge & Clark, 1992, Sudanonautes Bott, 1955, and Platythelphusa A. Milne-Edwards, 1887. Twelve genera from West and East Africa, Seychelles, and Madagascar are assigned to Deckeniinae (see Cumberlidge et al . 2008; Meyer et al. 2014; Daniels et al . 2015): Deckenia Hilgendorf, 1869, Seychellum Ng, Stevcic & Pretzmann, 1995, Globonautes Bott, 1959, Afrithelphusa Bott, 1969, Boreas Cumberlidge & Sternberg, 2002, Foza Reed & Cumberlidge, 2006a, Hydrothelphusa A. Milne-Edwards, 1872, Madagapotamon Bott, 1965, Malagasya Cumberlidge & Sternberg, 2002, Marojejy Cumberlidge, Boyko & Harvey, 2000, Skelosophusa Ng & Takeda, 1994, and Glabrithelphusa Meyer, Cumberlidge & Koppin, 2014.
9 citations
TL;DR: The endemic, monotypic freshwater crab species Seychellum alluaudi was used as a template to examine the initial colonisation and evolutionary history among the major islands in the Seyellinges Archipelago and results revealed limited genetic variation within localities with most variation occurring among localities.
TL;DR: The family Deckeniidae Ortmann, 1897, is revised and only 2 East African species are recognised, D. imitatrix Hilgendorf, 1869, and D. mitis Hilgenderf, 1898, and this species is redescribed and assigned to a new genus.
Abstract: The family Deckeniidae Ortmann, 1897, is revised and only 2 East African species are recognised, D. imitatrix Hilgendorf, 1869, and D. mitis Hilgendorf, 1898. The identity of the poorly known species from Seychelles, Indian Ocean, Deckenia alluaudi A. Milne Edwards and Bouvier, 1893, is clarified. This species is redescribed, assigned to a new genus (Seychellum gen. nov.), removed from the Deckeniidae sensu stricto and transferred to the family Gecarcinucidae Rathbun, 1904.
TL;DR: Two new cryptic species of Seychellum are described that represent two evolutionarily separate lineages of a previously monotypic genus and raise to three the number of species of freshwater crabs known from SeYchelles.
Abstract: The Afrotropical freshwater crab genus Seychellum is endemic to the granitic Seychelles in the Indian Ocean (Mahe, Silhouette, Praslin, La Digue and Fregate). Here we describe two new cryptic species of Seychellum that represent two evolutionarily separate lineages of a previously monotypic genus. This raises to three the number of species of freshwater crabs known from Seychelles. Each species is endemic to either one island (Silhouette) or to a pair of islands (Mahe and Fregate, or Praslin and La Digue). The three species can be clearly distinguished as separate lineages by DNA analysis, haplotyping and examination of gonopod characters. The recognition of S. silhouette, sp. nov. (endemic to Silhouette) and S. mahefregate, sp. nov. (endemic to Mahe and Fregate) reduces the range of the type species, S. alluaudi (A. Milne-Edwards & Bouvier, 1893) to La Digue and Praslin. Both dispersal and vicariance may have played a role in shaping the present distribution patterns of the Seychellois freshwater crabs.
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| Year | Papers |
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| 2017 | 1 |
| 2014 | 1 |
| 2011 | 1 |
| 1995 | 1 |