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The short wavelength sensitive (SWS) opsin gene is expected to contain informative sites for understanding the speciation
of the family Delphinidae, because it is not functional in cetaceans. We determined partial SWS gene sequences from 15 delphinid
species of 12 genera and from harbor porpoise for comparison. We found a 39-bp insertion that was shared by six species (the
insertion group: Delphinus delphis, Delphinus capensis, Stenella longirostris, Stenella coeruleoalba, Lagenodelphis hosei, and Sousa chinensis) and common base substitutions shared by eight species (Stenella frontalis, Tursiops truncatus, and six species of the insertion group). As these insertions and substitutions are not found in the other seven delphinids
or in the cloven-hoofed mammals (which are close to cetaceans), it is suggested that these eight species are more closely
related to each other than to the other species. This hypothesis is supported by phylogenetic analyses. The eight species
with the substitutions formed a clade containing two sister clades, one consisting of the insertion group and the other consisting
of the two other species, in both neighbor-joining and Bayes analyses. Phylogenetic analyses also showed that Lissodelphis borealis and Lagenorhynchus obliquidens are closely related and that their common ancestor diverged from the others at an early stage of delphinid evolution. 相似文献
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Yazawa Ryosuke Kubokawa Tsubasa Ichida Kensuke Kawamura Wataru Tani Reoto Kamio Shigeharu Morita Tetsuro Yoshizaki Goro 《Fisheries Science》2021,87(1):105-112
Fisheries Science - Our ultimate aim is to establish a small-bodied surrogate broodstock (e.g., mackerel) that produces functional gametes of the Pacific bluefin tuna Thunnus orientalis using... 相似文献
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