Revision of <i>Nannocharax luapulae</i> Boulenger, 1915 (Characiformes: Distichodontidae) from the Upper Congo basin: Evidence for a species pair

Manda, Bauchet Katemo; Snoeks, Jos; Decru, Eva; Brecko, Jonathan; Vreven, Emmanuel

doi:10.1111/jfb.15400

Cited by 4 publications

(2 citation statements)

References 37 publications

(63 reference statements)

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“…A new Nannocharax species for science has been collected in the Lovoi River [50]. This new species, here named N. sp.…”

Section: Distichodontidaementioning

confidence: 99%

“…The main difference between these two ecoregions lies in the fish fauna of the Congo River tributaries. In addition, Chiloglanis msirii [34] and Nannocharax chochamandai [50] are reported from the UNP (Upper Lualaba) and the Lukuga River basin, the outlet of Lake Tanganyika (Upper Congo), reflecting the interchange between these two ecoregions. Finally, a Cytb mtDNA genetic study between different populations of Clarias gariepinus from the Congo Basin and its surrounding basins revealed that the population of the Kamalondo Depression (UNP, Upper Lualaba), and those of Kisangani (Upper Congo) and Kinshasa (Pool Malebo) have a high affinity [97], thus providing the phylogenetic evidence of fish connectivity between these neighbouring ecoregions within the Congo Basin.…”

Section: Ichthyofaunal Affinities With the Neighbouring Ecoregionsmentioning

confidence: 99%

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The Upemba National Park (Upper Congo Basin, DR Congo): An Updated Checklist Confirming Its Status as an African Fish Biodiversity Hotspot

Katemo Manda,

Snoeks,

Chocha Manda

et al. 2023

Diversity

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An annotated checklist of the ichthyofauna of the Upemba National Park, draining part of the Upper Lualaba basin and situated in the southern part of the Democratic Republic of the Congo, is presented, based on a literature review, a re-examination of museum collections, and a study of recent collections (2012–2020). In total, 247 native and 1 introduced species, Heterotis niloticus, are reported. The native species belong to 78 genera, 26 families, and 15 orders. Of these, 45 species (18%) are endemic to the park, 35 species (14%) await formal description, and 5 taxa (2%) need further study to clarify their status. With 51 species, the Cyprinidae is by far the most species-rich family, followed by the Mormyridae (26), Mochokidae (26), Alestidae (18), Distichodontidae (18), Amphiliidae (17), and Cichlidae (16). The remaining families are represented by less than 15 species. Comments about the species distribution and the fish fauna shared with adjacent ecoregions are provided. Although the park provides some protection for the fish species living within its borders by limiting human access to the core zone, the annex and buffer zones are both subject to strong anthropogenic pressure. These observations underscore the need for the implementation and further elaboration of fish-related preservation guidelines and plans to enable better protection/conservation of the park’s ichthyofauna.

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“…A new Nannocharax species for science has been collected in the Lovoi River [50]. This new species, here named N. sp.…”

Section: Distichodontidaementioning

confidence: 99%

Section: Ichthyofaunal Affinities With the Neighbouring Ecoregionsmentioning

confidence: 99%

The Upemba National Park (Upper Congo Basin, DR Congo): An Updated Checklist Confirming Its Status as an African Fish Biodiversity Hotspot

Katemo Manda,

Snoeks,

Chocha Manda

et al. 2023

Diversity

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Description of a new endemic Enteromius (Teleostei: Cyprinidae) from the upper Malagarazi in Burundi: Lessons for a protected area under implementation

Bigirimana,

Kisekelwa,

da Costa

et al. 2024

Journal of Fish Biology

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Recent collecting efforts in the upper Malagarazi basin (2013–2022) allowed for an integrative study based on qualitative (colour), quantitative (meristic and metric), and barcoding gene [mtDNA, cytochrome c oxidase (COI)] data of specimens similar to Enteromius sp. ‘ascutelatus’, being a previously identified, potentially, new species. Based on these data, the present study confirms its identification as a new species for science, which is here formally described as Enteromius nzigidaherai sp. nov. This new species belongs to the group of Enteromius species for which the last unbranched ray of the dorsal fin is flexible and devoid of serrations along its posterior edge. This species has a horizontal series of black spots at the midlateral level of the sides. Three congeneric species, known from the Congo basin sensu lato, with two of them also found in the upper Malagarazi basin, are most similar to it. However, E. nzigidaherai sp. nov. is distinguished from the two sympatric upper Malagarazi species, that is, E. quadrilineatus and E. lineomaculatus, at least by two meristics and two morphometrics. It is also distinguished from E. urostigma, known from the upper Congo basin, by two meristics and one, apparently related, morphometric. In addition, a barcoding (mtDNA, COI) study revealed that the specimens of E. nzigidaherai sp. nov. form a well‐supported, separate lineage, with a K2P genetic distance of more than 10% with specimens identified as E. quadrilineatus and E. lineomaculatus, both originating from the upper Malagarazi basin and for which tissue samples were available. Finally, the new species was found to be endemic to the upper reaches of two left bank affluents of the upper Malagarazi basin: the Muyovozi and the Kinwa. However, both affluents are threatened by human activities, which seem to have resulted in its local disappearance as recent intensive collecting efforts in the latter affluent have remained unsuccessful. The species should thus be considered Critically Endangered (CR) according to IUCN criteria B1ab(ii,iv)c(i,iii). Therefore, it is hoped that the present description draws renewed attention to the importance of aquatic protection in the region by highlighting the need for the effective establishment of the Malagarazi Nature Reserve and concern for its optimal delimitation to efficiently protect the entire ichthyofauna of the upper Malagarazi, without excluding the fish species confined to its affluent rivers.

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Hidden species diversity in the Enteromius Cope, 1867 (Teleostei: Cyprinidae) from the Aruwimi basin (Middle Congo) in the Okapi Wildlife Reserve (Democratic Republic of the Congo)

Mayo Ilodiri,

Huyghe,

da Costa

et al. 2024

Journal of Fish Biology

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Two new African minnow species, Enteromius cerinus sp. nov. and Enteromius ruforum sp. nov., are described for science from the Angadiko River, a left‐bank sub‐affluent of first order of the Nepoko River, draining the north‐eastern part of the Okapi Wildlife Reserve (OWR). Both new species belong to the group of Enteromius for which the last unbranched dorsal‐fin ray is flexible and underrated. Within this morphological group, both are most similar to Enteromius kamolondoensis, especially in life colour pattern characteristics. However, Enteromius cerinus sp. nov. differs from E. kamolondoensis by its low number of circumpeduncular scales, 10–11 (vs. 12), low maximum body depth, 22.8%–25.7% standard length (Ls) (vs. 26.1%–30.0%), and long anterior and posterior barbel lengths, 32.6%–35.3% head length (LH) (vs. 23.6%–27.2%) and 41.6%–43.9% LH (vs. 30.3%–34.9%), respectively. Further, E. ruforum sp. nov. is also easily distinguished from E. kamolondoensis by its high maximum body depth, 30.6%–33.3% Ls (vs. 26.1%–30.0%), and small, isometric, eye diameter, 26.2%–28.0% LH (vs. 29.1%–31.9%). A barcoding study (mtDNA, cytochrome oxidase subunit I [COI]) revealed that specimens of both new species form lineages well differentiated from those of other available species. As such, (i) E. cerinus sp. nov. diverges from E. kamolondoensis by a K2P genetic distance (GD) of 10.3% and (ii) E. ruforum sp. nov. by a K2P GD of 11.2%. To the present day, the fish fauna of the left‐bank sub‐affluents of the Nepoko River, in general, remains poorly known or undocumented. Unfortunately, at the same time, multiple anthropogenic impacts are affecting this fauna, such as (i) the destruction of habitats along the river banks for agriculture and fishing and (ii) the use of illegal fishing practices, such as fishing with plant‐based ichthyotoxins during ecopage, which is combined with dam building. As a result of the demographic growth, this ecopage results in overfishing and thus is threatening both new species in particular, but all other co‐occurring fish species as well. Both new species, E. cerinus sp. nov. and E. ruforum sp. nov., should thus be considered Vulnerable (VU) according to IUCN criterion D2. It is therefore hoped that their discovery highlights the urgent need for a better protection and further in situ exploration of the reserve's freshwater (fish) biodiversity, in general, and that of those small sub‐affluents, in particular.

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Revision of Nannocharax luapulae Boulenger, 1915 (Characiformes: Distichodontidae) from the Upper Congo basin: Evidence for a species pair

Cited by 4 publications

References 37 publications

The Upemba National Park (Upper Congo Basin, DR Congo): An Updated Checklist Confirming Its Status as an African Fish Biodiversity Hotspot

The Upemba National Park (Upper Congo Basin, DR Congo): An Updated Checklist Confirming Its Status as an African Fish Biodiversity Hotspot

Description of a new endemic Enteromius (Teleostei: Cyprinidae) from the upper Malagarazi in Burundi: Lessons for a protected area under implementation

Hidden species diversity in the Enteromius Cope, 1867 (Teleostei: Cyprinidae) from the Aruwimi basin (Middle Congo) in the Okapi Wildlife Reserve (Democratic Republic of the Congo)

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