Oryzias marmoratus (Kottelat, 1990)
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https://doi.org/ 10.5281/zenodo.5342830 |
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https://treatment.plazi.org/id/03BF153A-FFFB-FFF1-FCCF-3FA62986FD75 |
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Diego |
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Oryzias marmoratus |
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Notes on Oryzias marmoratus View in CoL vs. O. profundicola .
– Oryzias marmoratus View in CoL and O. profundicola View in CoL show at least some overlap in diagnostic meristic and morphometric characters (dorsal and anal fin ray counts, relative body depth; Kottelat, 1990a). In contrast to Oryzias View in CoL from L. Lontoa, which can clearly be assigned to O. marmoratus View in CoL (Appendix 1), determination of sympatric O. marmoratus View in CoL vs. O. profundicola View in CoL in L. Towuti was accordingly not unequivocally straightforward in the sample we examined (see Appendix 2 for individual morphometric and meristic data). Two out of the six specimens examined in detail here show character states conflicting with a clear assignment to either of the two species, and determination of three additional individuals is based solely on anal fin ray counts. The same applies to pigmentation characters, which are—at least in preserved individuals—not unequivocally diagnostic in all specimens. Occasional hybridization ( Parenti, 2008) or early stages of divergence, in this case shallow-water dwelling O. marmoratus View in CoL vs. clearly lacustrine O. profundicola View in CoL , are among the most likely explanations for this phenomenon. Both are predicted for evolving radiations, and occur in another radiation of freshwater atherinomorph fishes in the Malili Lakes area ( Herder et al. 2006b, 2008; Schwarzer et al. 2008). Given the additional complexity due to significant geographic variation within O. marmoratus ( Kottelat, 1990a) View in CoL , we stress that focus studies incorporating additional material will be required to solve this issue.
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Oryzias marmoratus
Herder, Fabian & Chapuis, Simone 2010 |
Oryzias
D.S.Jordan & Snyder 1906 |