Marcusenius moorii (Gunther, 1867)

Ozouf-Costaz, Catherine, Coutanceau, Jean-Pierre, Bonillo, Céline, Belkadi, Laurent, Fermon, Yves, Agnese, Jean-François, Guidi-Rontani, Chantal & Paugy, Didier, 2015, First insights into karyotype evolution within the family Mormyridae, Cybium 39 (3), pp. 227-236 : 231

Marcusenius moorii

The karyotype is composed of 2n = 50 (4sm + 46a), FN = 54. C-bands are less clearly marked than in G. petersii and essentially found in the centromeric regions of all chromosomes, but observed in interstitial position in the long arms of the large sm pair in several metaphase plates ( Fig. 3 ). The 18S rDNA genes are located in the narrow DAPI-negative pericentromeric region of a medium size acrocentric pair ( Fig. 4E, F ). The telomeric probe produced a weak signal on all chromosomes but not at their four telomeres and no ITS could be recorded ( Fig. 4G ). The microsatellite (GAA) 10 is abundant, mainly located in telomeric positions with few intercalary bands in pericentromeric position in some chromosome pairs ( Fig. 4H ).

Figures

Figure 3. - Karyotypes of G. petersii, GNPE, M. moorii, MAMO, I. opdenboschi, IVOP, Brienomyrus sp., BR SP, S. walkeri, STWA, and P. microphthalmus, PEMI, after conventional Giemsa staining and C-banding. Scale bar = 10 µm.

Figure 4. - Metaphase plates of G. petersii (A, B, C, D), M. moorii (E, F, G, H) and I. opdenboschi (I, J, K, L), showing FISH patterns of the 18S rDNA probe, indirectly DIG-labelled, detected with rhodamine; DAPI counterstaining on the same metaphase plate; patterns of the Atto 488 labeled (TTAGGG)7 probe; patterns of the Cy3 labeled (GAA)10 satellite probe. Scale bars = 10 µm.