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Hiromichi Hirano - One of the best experts on this subject based on the ideXlab platform.
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eodelphis kabatensis a new name for the oldest true dolphin stenella kabatensis horikawa 1977 cetacea odontoceti Delphinidae from the upper miocene of japan and the phylogeny and paleobiogeography of delphinoidea
Journal of Vertebrate Paleontology, 2014Co-Authors: Mizuki Murakami, Chieko Shimada, Yoshinori Hikida, Yuhji Soeda, Hiromichi HiranoAbstract:ABSTRACT The oldest reported fossil record of Delphinidae is from the late Miocene (11 Ma) of California. Reliable Miocene fossil delphinids, however, are few. Eodelphis kabatensis from the upper Miocene Mashike Formation (8.5–13.0 Ma), Hokkaido, northern Japan, is the oldest described Miocene delphinid including a skull. Therefore, this species is a significant clue to understanding the early evolutionary history of Delphinidae. The original taxonomic assignment of this species within the genus Stenella is questionable; thus, we propose a new combination for the species, Eodelphis kabatensis Horikawa, 1977. Eodelphis is a basal delphinid, and comprehensive morphological cladistic analysis, including molecular topological constraints, supported this taxonomic revision. Paleobiogeographic analyses based on the present morphological cladistic analysis and analysis under the molecular constraints suggest that the origin and early diversification of Delphinidae occurred in the middle Miocene Pacific Ocean or ...
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Eodelphis kabatensis, a new name for the oldest true dolphin Stenella kabatensis Horikawa, 1977 (Cetacea, Odontoceti, Delphinidae), from the upper Miocene of Japan, and the phylogeny and paleobiogeography of Delphinoidea
2014Co-Authors: Mizuki Murakami, Chieko Shimada, Yoshinori Hikida, Yuhji Soeda, Hiromichi HiranoAbstract:ABSTRACTThe oldest reported fossil record of Delphinidae is from the late Miocene (11 Ma) of California. Reliable Miocene fossil delphinids, however, are few. Eodelphis kabatensis from the upper Miocene Mashike Formation (8.5-13.0 Ma), Hokkaido, northern Japan, is the oldest described Miocene delphinid including a skull. Therefore, this species is a significant clue to understanding the early evolutionary history of Delphinidae. The original taxonomic assignment of this species within the genus Stenella is questionable; thus, we propose a new combination for the species, Eodelphis kabatensis Horikawa, 1977. Eodelphis is a basal delphinid, and comprehensive morphological cladistic analysis, including molecular topological constraints, supported this taxonomic revision. Paleobiogeographic analyses based on the present morphological cladistic analysis and analysis under the molecular constraints suggest that the origin and early diversification of Delphinidae occurred in the middle Miocene Pacific Ocean or elsewhere, respectively.SUPPLEMENTAL DATA—Supplemental materials are available for this article for free at http://www.tandfonline.com/UJVP.
Mizuki Murakami - One of the best experts on this subject based on the ideXlab platform.
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eodelphis kabatensis a new name for the oldest true dolphin stenella kabatensis horikawa 1977 cetacea odontoceti Delphinidae from the upper miocene of japan and the phylogeny and paleobiogeography of delphinoidea
Journal of Vertebrate Paleontology, 2014Co-Authors: Mizuki Murakami, Chieko Shimada, Yoshinori Hikida, Yuhji Soeda, Hiromichi HiranoAbstract:ABSTRACT The oldest reported fossil record of Delphinidae is from the late Miocene (11 Ma) of California. Reliable Miocene fossil delphinids, however, are few. Eodelphis kabatensis from the upper Miocene Mashike Formation (8.5–13.0 Ma), Hokkaido, northern Japan, is the oldest described Miocene delphinid including a skull. Therefore, this species is a significant clue to understanding the early evolutionary history of Delphinidae. The original taxonomic assignment of this species within the genus Stenella is questionable; thus, we propose a new combination for the species, Eodelphis kabatensis Horikawa, 1977. Eodelphis is a basal delphinid, and comprehensive morphological cladistic analysis, including molecular topological constraints, supported this taxonomic revision. Paleobiogeographic analyses based on the present morphological cladistic analysis and analysis under the molecular constraints suggest that the origin and early diversification of Delphinidae occurred in the middle Miocene Pacific Ocean or ...
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Eodelphis kabatensis, a new name for the oldest true dolphin Stenella kabatensis Horikawa, 1977 (Cetacea, Odontoceti, Delphinidae), from the upper Miocene of Japan, and the phylogeny and paleobiogeography of Delphinoidea
2014Co-Authors: Mizuki Murakami, Chieko Shimada, Yoshinori Hikida, Yuhji Soeda, Hiromichi HiranoAbstract:ABSTRACTThe oldest reported fossil record of Delphinidae is from the late Miocene (11 Ma) of California. Reliable Miocene fossil delphinids, however, are few. Eodelphis kabatensis from the upper Miocene Mashike Formation (8.5-13.0 Ma), Hokkaido, northern Japan, is the oldest described Miocene delphinid including a skull. Therefore, this species is a significant clue to understanding the early evolutionary history of Delphinidae. The original taxonomic assignment of this species within the genus Stenella is questionable; thus, we propose a new combination for the species, Eodelphis kabatensis Horikawa, 1977. Eodelphis is a basal delphinid, and comprehensive morphological cladistic analysis, including molecular topological constraints, supported this taxonomic revision. Paleobiogeographic analyses based on the present morphological cladistic analysis and analysis under the molecular constraints suggest that the origin and early diversification of Delphinidae occurred in the middle Miocene Pacific Ocean or elsewhere, respectively.SUPPLEMENTAL DATA—Supplemental materials are available for this article for free at http://www.tandfonline.com/UJVP.
Ulfur Arnason - One of the best experts on this subject based on the ideXlab platform.
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Molecular studies on two variant repeat types of the common cetacean DNA satellite of the sperm whale, and the relationship between Physeteridae (sperm whales) and Ziphiidae (beaked whales).
Molecular Biology and Evolution, 1993Co-Authors: Solveig Gretarsdottir, Ulfur ArnasonAbstract:In the sperm whale (Physeter macrocephalus) two different repeat types (A and B) of the common cetacean DNA satellite were identified. The evolution of each group of repeats appears to be independent from that of the other. The sequence similarity between the two groups is less than the similarity between group A and repeats of the satellite in related whale species. The systematic relationship within and between the families Physeteridae (sperm whales) and Ziphiidae (beaked whales) was addressed by both sequence analysis of the satellite and comparisons with the families Delphinidae and Phocoenidae. The mysticete blue whale (Balaenoptera musculus) was used as an outgroup in the comparisons. The molecular phylogeny, when maximum-parsimony analysis and the neighbor-joining method were used, grouped together species of each family. At the family level the ziphiids grouped closet to the families Phocoenidae and Delphinidae. The similarities between the common cetacean satellite of the blue whale and the sperm whale were greater than those between the blue whale and the other odontocetes included, suggesting that the evolution of the satellite is slower in the sperm whale than in the other odontocetes.
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mysticete baleen whale relationships based upon the sequence of the common cetacean dna satellite
Molecular Biology and Evolution, 1992Co-Authors: Ulfur Arnason, S GretarsdottirAbstract:The genomes of all extant cetaceans are characterized by the presence of the so-called common cetacean DNA satellite. In the mysticetes (whalebone whales) the repeat length of the satellite is 1,760 bp. In the odontocetes (toothed whales), other than the family Delphinidae, the repeat length is usually approximately 1,740 bp. The Delphinidae are characterized by a repeat length of approximately 1,580 bp. It has been shown in odontocetes that the satellite evolves in concert and that differences between species, with respect to the sequence of the satellite, correspond reasonably well to their evolutionary distances. In the present study the sequence of the satellite was determined in three repeats in each of seven mysticete species, and a consensus for each species established. Parsimony and neighbor-joining analyses based upon sequences of all repeats showed that the primary evolutionary distinction among the mysticetes is between the Balaenidae sensu stricto (i.e., the bowhead whale and the right whale) and all remaining species, including the pygmy right whale, a species that usually has been included in the Balaenidae. The comparisons also showed that the humpback whale and the gray whale were approximately equidistant from the blue whale and the fin whale (genus Balaenoptera). Concerted evolution of the satellite was also demonstrated among the mysticetes, but it appeared to evolve more slowly in the mysticetes than in the odontocetes.
Haydée A. Cunha - One of the best experts on this subject based on the ideXlab platform.
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Phylogenetic status and timescale for the diversification of Steno and Sotalia dolphins.
PloS one, 2011Co-Authors: Haydée A. Cunha, José Lailson-brito, Lucas C. Moraes, Bruna V. Medeiros, Antonio M. Solé-cava, Carlos G. SchragoAbstract:Molecular data have provided many insights into cetacean evolution but some unsettled issues still remain. We estimated the topology and timing of cetacean evolutionary relationships using Bayesian and maximum likelihood analyses of complete mitochondrial genomes. In order to clarify the phylogenetic placement of Sotalia and Steno within the Delphinidae, we sequenced three new delphinid mitogenomes. Our analyses support three delphinid clades: one joining Steno and Sotalia (supporting the revised subfamily Stenoninae); another placing Sousa within the Delphininae; and a third, the Globicephalinae, which includes Globicephala, Feresa, Pseudorca, Peponocephala and Grampus. We also conclude that Orcinus does not belong in the Globicephalinae, but Orcaella may be part of that subfamily. Divergence dates were estimated using the relaxed molecular clock calibrated with fossil data. We hypothesise that the timing of separation of the marine and Amazonian Sotalia species (2.3 Ma) coincided with the establishment of the modern Amazon River basin.
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human induced injuries to marine tucuxis sotalia guianensis cetacea Delphinidae in brazil
Marine Biodiversity Records, 2009Co-Authors: Alexandre F Azevedo, Haydée A. Cunha, Jose Lailsonbrito, Paulo R Dorneles, Monique Van Sluys, Ana Bernadete Lima FragosoAbstract:alexandre f. azevedo, jose lailson-brito, paulo r. dorneles, monique van sluys, hayde e a. cunha and ana b.l. fragoso Laboratorio de Mamiferos Aquaticos (MAQUA), Faculdade de Oceanografia, UERJ, Rua Sao Francisco Xavier 524, Maracana, Rio de Janeiro, 20550-013, Brazil, Laboratorio de Radioisotopos, UFRJ, Brazil, PPGEE/IBRAG, Departamento de Ecologia, UERJ, Brazil, Laboratorio de Biodiversidade Molecular, UFRJ, Brazil
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Twelve microsatellite loci for marine and riverine tucuxi dolphins ( Sotalia guianensis and Sotalia fluviatilis )
Molecular Ecology Notes, 2007Co-Authors: Haydée A. Cunha, Phillip C. WattsAbstract:Twelve dinucleotide polymorphic microsatellite loci were isolated from the marine tucuxi dolphin ( Sotalia guianensis ). Levels of genetic diversity were assessed using 34 individuals from the coasts of Rio de Janeiro and Para, Brazil. Numbers of alleles varied between two and 14, and observed and expected heterozygosities ranged from 0.040 to 0.704, and from 0.093 to 0.818, respectively. Moreover, eight of these loci were variable in the riverine tucuxi Sotalia fluviatilis . This is the first description of microsatellite primers from a dolphin that does not belong to the Delphininae. These loci are currently being used in the analysis of population structure of both tucuxi species.
Chieko Shimada - One of the best experts on this subject based on the ideXlab platform.
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eodelphis kabatensis a new name for the oldest true dolphin stenella kabatensis horikawa 1977 cetacea odontoceti Delphinidae from the upper miocene of japan and the phylogeny and paleobiogeography of delphinoidea
Journal of Vertebrate Paleontology, 2014Co-Authors: Mizuki Murakami, Chieko Shimada, Yoshinori Hikida, Yuhji Soeda, Hiromichi HiranoAbstract:ABSTRACT The oldest reported fossil record of Delphinidae is from the late Miocene (11 Ma) of California. Reliable Miocene fossil delphinids, however, are few. Eodelphis kabatensis from the upper Miocene Mashike Formation (8.5–13.0 Ma), Hokkaido, northern Japan, is the oldest described Miocene delphinid including a skull. Therefore, this species is a significant clue to understanding the early evolutionary history of Delphinidae. The original taxonomic assignment of this species within the genus Stenella is questionable; thus, we propose a new combination for the species, Eodelphis kabatensis Horikawa, 1977. Eodelphis is a basal delphinid, and comprehensive morphological cladistic analysis, including molecular topological constraints, supported this taxonomic revision. Paleobiogeographic analyses based on the present morphological cladistic analysis and analysis under the molecular constraints suggest that the origin and early diversification of Delphinidae occurred in the middle Miocene Pacific Ocean or ...
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Eodelphis kabatensis, a new name for the oldest true dolphin Stenella kabatensis Horikawa, 1977 (Cetacea, Odontoceti, Delphinidae), from the upper Miocene of Japan, and the phylogeny and paleobiogeography of Delphinoidea
2014Co-Authors: Mizuki Murakami, Chieko Shimada, Yoshinori Hikida, Yuhji Soeda, Hiromichi HiranoAbstract:ABSTRACTThe oldest reported fossil record of Delphinidae is from the late Miocene (11 Ma) of California. Reliable Miocene fossil delphinids, however, are few. Eodelphis kabatensis from the upper Miocene Mashike Formation (8.5-13.0 Ma), Hokkaido, northern Japan, is the oldest described Miocene delphinid including a skull. Therefore, this species is a significant clue to understanding the early evolutionary history of Delphinidae. The original taxonomic assignment of this species within the genus Stenella is questionable; thus, we propose a new combination for the species, Eodelphis kabatensis Horikawa, 1977. Eodelphis is a basal delphinid, and comprehensive morphological cladistic analysis, including molecular topological constraints, supported this taxonomic revision. Paleobiogeographic analyses based on the present morphological cladistic analysis and analysis under the molecular constraints suggest that the origin and early diversification of Delphinidae occurred in the middle Miocene Pacific Ocean or elsewhere, respectively.SUPPLEMENTAL DATA—Supplemental materials are available for this article for free at http://www.tandfonline.com/UJVP.
