A revision of the family Deckeniidae Ortmann, 1897 (Crustacea: Decapoda: Brachyura: Potamoidea), with description of a new genus (Gecarcinucidae: Gecarcinucoidea) from the Seychelles, Indian Ocean

Ng, Peter K. L.; Števčić, Zdravko; Pretzmann, G.

doi:10.1080/00222939500770201

Cited by 29 publications

(17 citation statements)

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“…One possibility can be discounted-that they arrived on Ascension at a time when the Atlantic was much narrower. Such an explanation has been given for the occurrence of the freshwater crab, Seychellum alluaudi (A. Milne-Edwards & Bouvier, 1893) on the Seychelles: that it is a relict of the time when the Seychelles were joined to the African/Asian land mass some 35 mya (Ng et al, 1995). Since Ascension Island arose only 1-1.5 mya (Atkins et al, 1964), when the Atlantic Ocean was at roughly its current width, such an argument is untenable.…”

Section: The Origin Of Ascension Island Land Crabsmentioning

confidence: 92%

Johngarthia lagostoma (H. Milne Edwards, 1837) on Ascension Island: a very isolated land crab population

Hartnoll¹,

Mackintosh²,

Pelembe³

2006

Crustac

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A study was made of the land crab, Johngarthia lagostoma (H. Milne Edwards, 1837) on Ascension Island in the central South Atlantic: aspects of its distribution, population structure, and reproduction are described. On Ascension it is normally limited to altitudes >200 m, the only parts of the island with substantial vegetation. The population comprised predominantly pale colour morphs, and few immature specimens were sampled. The significance of both factors is examined. The breeding migration to the shore was observed. Migrations occurred in February to April, varied in intensity between years, and were dominated by females. Migrants had to cross the bare arid lowlands, resulting in mortality. There are no recent records of the return of the juvenile crabs after the planktonic larval phase.

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Section: The Origin Of Ascension Island Land Crabsmentioning

confidence: 92%

Johngarthia lagostoma (H. Milne Edwards, 1837) on Ascension Island: a very isolated land crab population

Hartnoll¹,

Mackintosh²,

Pelembe³

2006

Crustac

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“…If all trogloplacines have abbreviated (or at least a semi-abbreviated) development and there are no free-swimming larvae, how did they disperse so widely? Despite hypotheses that primary freshwater crabs may have dispersed through Gondwanic connections (Ng et al 1995), the available evidence is that they are not old enough to have done so (see Daniels et al 2006; Cumberlidge et al 2008; Klaus et al 2009; Cumberlidge and Ng 2009; Daniels 2011; Cumberlidge and Daniels 2014); and as such, the disjunct distribution of A. insperatus sp. n. begs further studies.…”

Section: Systematicsmentioning

confidence: 99%

A new species of trogloplacine crab of the genus Australocarcinus Davie, 1988 from a freshwater stream in Mahé, Seychelles (Crustacea, Brachyura, Chasmocarcinidae)

Ng¹,

Daniels²

2018

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A new species of freshwater chasmocarcinid crab, Australocarcinus insperatus sp. n., is described from the Seychelles Islands in the Indian Ocean. This is the first record of the genus and the subfamily Trogloplacinae Guinot, 1986, from the Indian Ocean, with all other members previously recorded from Australia, New Britain, New Caledonia, and Palau in the Pacific Ocean. The disjunct distribution of Australocarcinus is unexpected considering all trogoplacines are believed to practice direct development, lacking free-swimming larval stages. The new species is morphologically most similar to A. riparius Davie, 1988, from Queensland, Australia, but can be distinguished from its three congeners on the basis of the structures of its carapace, ambulatory legs and male first gonopod.

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“…The Deckeniini comprises two distinct groups (recognized here as subtribes) that are named the Deckeniina and the Globonautina. The Deckeniina includes Deckenia from East Africa and its sister genus Seychellum from the Seychelles, so linking genera that were previously referred to two different families, the Deckeniidae and Gecarcinucidae, respectively (Bott, 1955, 1960; Ng et al ., 1995). The Globonautina includes Globonautes and Afrithelphusa from West Africa that were previously assigned to the Gecarcinucidae (Bott, 1969, 1970b; Cumberlidge, 1999) although this family assignment was questioned by Cumberlidge (1999).…”

Section: Phylogeny Of the Afrotropical Freshwater Crabsmentioning

confidence: 99%

“…This region is a modern day remnant of the ancient Gondwanan supercontinent that includes the African mainland plus the major continental islands of Madagascar, the granitic Seychelles, Socotra, and the southern Arabian peninsula (Yeo et al ., 2007). Freshwater crabs are abundant throughout this entire region, with the exception of the driest desert areas, and all are endemic at the genus and species levels (Bott, 1955; Ng, Števčić & Pretzmann, 1995; Cumberlidge, 1999; Apel & Brandis, 2000; Cumberlidge & Sternberg, 2002; Cumberlidge & Wranik, 2002).…”

Section: Introductionmentioning

confidence: 99%

A revision of the higher taxonomy of the Afrotropical freshwater crabs (Decapoda: Brachyura) with a discussion of their biogeography

Cumberlidge

Sternberg

Daniels

2008

Biological Journal of the Linnean Society

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The higher taxonomy of the 20 known genera of Afrotropical freshwater crabs is revised to reflect the evolutionary relationships revealed by the consensus of a series of recent morphological and molecular phylogenetic studies of the group. The Afrotropical freshwater crab genera fall into two monophyletic groups, one from Socotra with two genera (Potamidae) and another that includes the remaining 18 genera. The latter group, which includes the bulk of the region's freshwater crab fauna, forms a well‐supported monophyletic clade. We recognize two monophyletic sister groups (subfamilies) within the Potamonautidae, one for seven genera from Africa (the Potamonautinae) and one for 11 genera from Africa, the Seychelles, and Madagascar (the Deckeniinae). The Deckeniinae includes two monophyletic groups (tribes), one with seven genera from Madagascar (the Hydrothelphusini), and one with four genera from Africa and the Seychelles (the Deckeniini). The Deckeniini is further divided here into two subtribes, the Deckeniina and the Globonautina. The Platythelphusidae is not recognized, and the Deckeniidae and Globonautinae are lowered in rank. There is no phylogenetic support for the continued inclusion of any genus from the Afrotropical region in the Gecarcinucidae which is treated here as an exclusively Oriental family. The Afrotropical freshwater crabs (excluding those from Socotra) form a monophyletic assemblage that has no representatives outside of the region. The wider biogeographical implications of the taxonomic revision are discussed. © 2008 The Linnean Society of London, Biological Journal of the Linnean Society, 2008, 93, 399–413.

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A revision of the family Deckeniidae Ortmann, 1897 (Crustacea: Decapoda: Brachyura: Potamoidea), with description of a new genus (Gecarcinucidae: Gecarcinucoidea) from the Seychelles, Indian Ocean

Cited by 29 publications

References 1 publication

Johngarthia lagostoma (H. Milne Edwards, 1837) on Ascension Island: a very isolated land crab population

Johngarthia lagostoma (H. Milne Edwards, 1837) on Ascension Island: a very isolated land crab population

A new species of trogloplacine crab of the genus Australocarcinus Davie, 1988 from a freshwater stream in Mahé, Seychelles (Crustacea, Brachyura, Chasmocarcinidae)

A revision of the higher taxonomy of the Afrotropical freshwater crabs (Decapoda: Brachyura) with a discussion of their biogeography

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