High levels of endemism in suckermouth catfishes (Mochokidae: Chiloglanis) from the Upper Guinean forests of West Africa

Schmidt, Ray C.; Bart, Henry L.; Pezold, Frank

doi:10.1016/j.ympev.2016.04.018

Cited by 20 publications

(30 citation statements)

References 23 publications

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“…Cryptic diversity was also found - albeit less frequently - in other lineages, e.g. spiny eels 8 and Neotropical 9–11 and African catfish 12,13 , including the family Mochokidae 14–16 . Generally, the main contributing factor to the undiscovered cryptic diversity of some species is the lack of clear distinguishing morphological features in combination with the absence of relevant molecular data 3 .…”

Section: Introductionmentioning

confidence: 97%

From taxonomic deflation to newly detected cryptic species: Hidden diversity in a widespread African squeaker catfish

Jírsová

Štefka

Blažek

et al. 2019

Sci Rep

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Cryptic genetic diversity and erroneous morphological species determination represent frequent problems in biodiversity research. Here, examination of 138 specimens of Synodontis (Mochokidae, Siluriformes) from the Nile River and Lake Turkana revealed the presence of both S. schall-like and S. frontosus-like morphotypes, with a phenotypic gradient between them. We concluded phylogenetic and population genetic analyses based on two mitochondrial and one nuclear marker including 131 coxI (565 bp), 96 cytb (973 bp) and 19 RAG2 (896 bp) sequences from the Nile-Turkana population, plus additional GenBank data of Synodontis spp. Whilst nuclear data were inconclusive, mitochondrial sequences suggested that both morphotypes and intermediate forms are conspecific. The results imply probable synonymy of S. frontosus with S. schall. Conversely, a strong biogeographical signal was revealed among widely distributed and supposedly conspecific S. schall-like catfish of the Nilo-Sudanian ichthyological province. Synodontis schall sensu stricto (=Eastern clade), as defined by type locality in the Nile, is apparently restricted to the eastern part of the Nilo-Sudanian ichthyological province (e.g. Nile, Turkana, Chad). Synodontis schall Western clade (Senegambia, Niger, Chad) most probably represents a cryptic taxon, unrecognized thus far due to the absence of distinctive morphological differences.

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Section: Introductionmentioning

confidence: 97%

From taxonomic deflation to newly detected cryptic species: Hidden diversity in a widespread African squeaker catfish

Jírsová

Štefka

Blažek

et al. 2019

Sci Rep

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“…(Schmidt unpublished). Similar patterns of divergences occur in the coastal rivers of the Upper Guinean forests (Schmidt et al 2016), Kenya and Tanzania (Schmidt et al 2017a), and South Africa (Chakona et al 2013). Published barcodes from C. mongoensis (GenBank accession numbers MN015674 and MN015675) are now available and should advance studies on the freshwater diversity in the region.…”

Section: Discussionmentioning

confidence: 74%

“…This species was similar to Chiloglanis harbinger Roberts, 1989 described from the Lokoundje River in Cameroon, but appeared to differ in some morphological and meristic aspects. Given the high degree of endemism observed in Chiloglanis species from western, eastern, and southern Africa (Friel & Vigliotta 2011;Schmidt et al 2014;Schmidt et al 2015;Morris et al 2016;Schmidt et al 2016;Schmidt et al 2017b) a thorough comparison of these newly collected specimens with type material of C. harbinger was warranted. After conducting morphological analyses it is clear that specimens collected in the Rio Mongo in Equatorial Guinea are distinct from C. harbinger and this new species is formally described.…”

Section: Introductionmentioning

confidence: 99%

A new species of suckermouth catfish (Mochokidae: Chiloglanis) from the Rio Mongo in Equatorial Guinea

Schmidt

Barrientos

2019

Zootaxa

Self Cite

775

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A recent expedition surveyed freshwater fishes throughout the continental portion of Equatorial Guinea (Rio Muni). This portion of the Lower Guinean ichthyoprovince is relatively unknown with very few collections occurring since the 1960s. Sampling in the Rio Mongo, a tributary to the Rio Wele, yielded two Chiloglanis species; one putatively ascribed to the widespread species C. cameronensis, and the other species having similarities with C. harbinger described from the Lokoundje River in Cameroon. Morphometric analyses between the specimens from Rio Mongo and paratypes of C. harbinger confirm that they are distinct species and should be described as such. Here we describe Chiloglanis mongoensis sp. nov., a narrow endemic species only known from one locality in the Rio Mongo. We provide measurements from paratypes of C. harbinger and emphasize the need for further expeditions in the area.

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“…Despite being one of the geographically and taxonomically well explored regions in southern Africa, new species and deeply divergent genetic lineages continue to be discovered within almost all fish taxonomic groups of the Cape Fold Ecoregion (Chakona and Swartz, 2013; Chakona and Skelton, 2017; Chakona et al 2013, 2014; Wishart et al 2006), and estimates indicate that there are about 43 undescribed species within the 21 currently recognised fish species of this region (Linder et al 2010). The discovery of hidden diversity in the EZH freshwater ecoregion adds to the growing evidence for the existence of high species-level diversity within a number of fish species from high altitude streams in southern, east and west Africa (e.g., Friel and Vigliotta 2011; Morris et al 2016; Schmidt and Pezold 2011; Schmidt et al 2014, 2015, 2016; Thomson 2013; Thomson and Page 2010). Given that many regions in southern Africa, in particular the subtropical and tropical river systems, have not been adequately explored, and the use of modern approaches for rapid species discovery remains very limited, additional diversity is likely to remain hidden within other wide-ranging ‘species’ in the region.…”

Section: Discussionmentioning

confidence: 97%

Evidence of hidden diversity and taxonomic conflicts in five stream fishes from the Eastern Zimbabwe Highlands freshwater ecoregion

Chakona¹,

Kadye²,

Bere³

et al. 2018

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Stream fishes of the Eastern Afromontane region are among the least studied vertebrates in this region, despite the potential for harbouring cryptic diversity. The present study examined mitochondrial cytochrome oxidase subunit I (COI) sequence divergence in 153 specimens of stream fishes belonging to four genera and three families, [(Amphilius and Zaireichthys (Amphiliidae); Chiloglanis (Mochokidae); and Hippopotamyrus (Mormyridae)], in the Eastern Zimbabwe Highlands (EZH) freshwater ecoregion to explore the extent to which the current taxonomy conceals the ichthyofaunal diversity in the region. The General Mixed Yule Coalescent (GMYC) species delineation method identified 14 clusters within five currently recognised ‘species’ from the EZH ecoregion. Only one of these clusters represents a named species, while 13 of them represent candidate or undescribed species. Our results revealed that effective conservation of this region’s unique biota is limited by the incomplete knowledge of taxonomic diversity and inaccurate mapping of species distribution ranges.

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High levels of endemism in suckermouth catfishes (Mochokidae: Chiloglanis) from the Upper Guinean forests of West Africa

Cited by 20 publications

References 23 publications

From taxonomic deflation to newly detected cryptic species: Hidden diversity in a widespread African squeaker catfish

From taxonomic deflation to newly detected cryptic species: Hidden diversity in a widespread African squeaker catfish

A new species of suckermouth catfish (Mochokidae: Chiloglanis) from the Rio Mongo in Equatorial Guinea

Evidence of hidden diversity and taxonomic conflicts in five stream fishes from the Eastern Zimbabwe Highlands freshwater ecoregion

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