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5 results for “Adrianichthys”
Figure 9. Adrianichthys poptae, USNM 322423 in A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae)
Figure 9. Adrianichthys poptae, USNM 322423, adult female, 168 mm SL. Diagrammatic representation of the anterior ramus of the palatine. Arrow indicates point of articulation of the palatine and quadrate bones. Anterior is to the left. Scale bar = 1 mm.
Figure 32. Adrianichthys kruyti Weber, 1913 in A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae)
Figure 32. Adrianichthys kruyti Weber, 1913, Lake Poso, Sulawesi Tengah, Indonesia, ZMH 22572, male, 86.7 mm SL.
Ghost introgression in ricefishes of the genus Adrianichthys in an ancient Wallacean lake
<p><span>Because speciation might have been promoted by ancient introgression from an extinct lineage, it is important to detect the existence of "ghost introgression" in focal taxa and examine its contribution to their diversification. In this study, we examined possible ghost introgression and its contributions to the diversification of ricefishes of the genus <em>Adrianichthys</em>in Lake Poso, an ancient lake on Sulawesi Island, in which some extinctions are known to have occurred. Population genomic analysis revealed that two extant <em>Adrianichthys</em> species, <em>A. oophorus</em> and <em>A. poptae</em>, are reproductively isolated from each other. Comparisons of demographic models demonstrated that introgression from a ghost population, which diverged from the common ancestor of <em>A. oophorus</em> and <em>A. poptae</em>, is essential for reconstructing the demographic history of <em>Adrianichthys</em>. The best model estimated that the divergence of the ghost population greatly predated the divergence between <em>A. oophorus</em> and <em>A. poptae</em>, and that the ghost population secondarily contacted the two extant species within Lake Poso more recently. Genome scans and simulations detected a greatly divergent locus, which cannot be explained without ghost introgression. This locus was also completely segregated between <em>A. oophorus</em> and <em>A. poptae</em>. These findings suggest that variants that came from a ghost population have contributed to the divergence between <em>A. oophorus</em>and <em>A. poptae</em>, but the large time-lag between their divergence and ghost introgression indicates that the contribution of introgression may be restricted.</span></p>
Ghost introgression in ricefishes of the genus Adrianichthys in an ancient Wallacean lake
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Figure 18. A. Adrianichthys oophorus, USNM 348386 in A phylogenetic analysis and taxonomic revision of ricefishes, Oryzias and relatives (Beloniformes, Adrianichthyidae)
Figure 18. A. Adrianichthys oophorus, USNM 348386, female, 60 mm SL; B. A. roseni, USNM 322425, female, 73 mm SL. Anterior portion of skull, jaws and jaw suspensorium. The cartilage that may be seen between the two preethmoid cartilages in B is the cartilaginous symphysis of the dentaries. Anterior is up.
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