Similarity of Karyotype Structure in Three Mormyrus Species (Mormyridae) from the White Nile and Omo River Tributaries (Ethiopia)

Simanovsky, Sergey A.; Medvedev, D. A.; Tefera, Fekadu; Голубцов, А. С.

doi:10.1134/s003294522102017x

Cited by 2 publications

(3 citation statements)

References 16 publications

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“…In this genus the pronounced divergence between species is similar to the situation in Marcusenius Gill, 1862, where two species studied have the same diploid chromosome number, but different karyotypic formula -M. moorii (Günther, 1867) has 4sm + 46a, M. cyprinoides (Linnaeus, 1758) has 22m + 4sm + 24a (2n = 50 for both) (Ozouf-Costaz et al 2015;Simanovsky et al 2020). On the contrary, among three species of the genus Mormyrus Linnaeus, 1758 no difference in their karyotype structure was found (Simanovsky et al 2021). Thus, a search for interspecific differences in the non-monotypic mormyrid genera looks quite informative.…”

Section: Resultsmentioning

confidence: 91%

“…The African weakly electric elephantfishes comprise the family Mormyridae including 22 genera and almost 230 species (Eschmeyer et al 2021;Froese and Pauly 2021). To date, the representatives of 14 mormyrid genera have been studied cytogenetically (Uyeno 1973;Krysanov and Golubtsov 2014;Ozouf-Costaz et al 2015;Canitz et al 2016;Simanovsky et al 2020Simanovsky et al , 2021. The diploid chromosome numbers in most elephantfishes vary between 48 and 52 with the mode 50 (Simanovsky et al 2020).…”

Section: Introductionmentioning

confidence: 99%

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Derived karyotypes in two elephantfish genera (Hyperopisus and Pollimyrus): lowest chromosome number in the family Mormyridae (Osteoglossiformes)

Simanovsky¹,

Medvedev²,

Tefera³

et al. 2021

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The African weakly electric elephantfish family Mormyridae comprises 22 genera and almost 230 species. Up-to-date cytogenetic information was available for 17 species representing 14 genera. Here we report chromosome number and morphology in Hyperopisus bebe (Lacepède, 1803) and Pollimyrus isidori (Valenciennes, 1847) collected from the White Nile system in southwestern Ethiopia. Both taxa displayed the diploid chromosome number 2n = 40, but they differed in fundamental numbers: FN = 66 in H. bebe and FN = 72 in P. isidori; previously the same diploid chromosome number 2n = 40 was reported in an undescribed species of Pollimyrus Taverne, 1971 (FN = 42) from the same region. Our results demonstrate that not only pericentric inversions, but fusions also played a substantial role in the evolution of the mormyrid karyotype structure. If the hypothesis that the karyotype structure with 2n = 50–52 and prevalence of the uni-armed chromosomes close to the ancestral condition for the family Mormyridae is correct, the most derived karyotype structures are found in the Mormyrus Linnaeus, 1758 species with 2n = 50 and the highest number of bi-armed elements in their compliments compared to all other mormyrids and in Pollimyrus isidori with the highest number of bi-armed elements among the mormyrids with 2n = 40.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Derived karyotypes in two elephantfish genera (Hyperopisus and Pollimyrus): lowest chromosome number in the family Mormyridae (Osteoglossiformes)

Simanovsky¹,

Medvedev²,

Tefera³

et al. 2021

CCG

Self Cite

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“…However, the conventional cytogenetic approach is still valuable and can provide insight into the species diversity of some fish groups (Reviewed in Cioffi et al, 2019;Jegede et al, 2018). The conventional cytogenetic procedure has been the major approach to investigating the chromosome composition of the Mormyridae (Krysanov & Golubtsov, 2014;Simanovsky et al, 2020;Simanovsky et al, 2021a;Simanovsky et al, 2021b;Jegede, 2022). However, karyotype knowledge of the mormyrids is still sparse: till now, karyotype information is known for only 14 genera and 19 species of the 22 genera and over 255 mormyrids' species (Simanovsky et al, 2021a); the paucity of cytogenetic information on this fish group has been a limiting factor to its application to their evolution and phylogeny.…”

Section: Introductionmentioning

confidence: 99%

Karyotype of the Mormyrid Baby Whale Fish (Osteoglossiformes: Mormyridae): Brienomyrus Brachyistius in Oluwa River, Nigeria

2022

JBAH

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The mormyrid fishes of the order Osteoglossiformes are abundant in the freshwaters of tropical Africa; the enormous species diversity of the group requires many systematics tools to comprehend this diversity better. Cytogenetics data can complement other systematics procedures to accomplish the above-stated objective, but information on many mormyrids' karyotypes is unavailable. In this study, Brienomyrus brachyistius from the Oluwa River was studied to enhance the understanding of the karyotype organization in the Mormyridae. Metaphase chromosomes were processed from the fish kidney following a conventional cytogenetic procedure; the fish was subjected to an intra-peritoneal colchicine injection at the rate of 1ml per 100g of fish mass. Hypotonic treatment was in 0.56% KCl solution, and cells fixation and washes were in 3: 1 methanol: acetic acid. The slides were stained with Giemsa solution, while the constitutive heterochromatin was revealed from the previous Giemsa stained slide using the C-banding sequential method. Capturing of metaphase images was done with an Olympus BX50 microscope. The karyotype of 2n = 50 (50sta) obtained in the species was the first mormyrid karyotype composed of 2n = 50 acrocentrics, supporting the proposed ancestral karyotype for the Mormyridae.

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Similarity of Karyotype Structure in Three Mormyrus Species (Mormyridae) from the White Nile and Omo River Tributaries (Ethiopia)

Cited by 2 publications

References 16 publications

Derived karyotypes in two elephantfish genera (Hyperopisus and Pollimyrus): lowest chromosome number in the family Mormyridae (Osteoglossiformes)

Derived karyotypes in two elephantfish genera (Hyperopisus and Pollimyrus): lowest chromosome number in the family Mormyridae (Osteoglossiformes)

Karyotype of the Mormyrid Baby Whale Fish (Osteoglossiformes: Mormyridae): Brienomyrus Brachyistius in Oluwa River, Nigeria

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