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Geisler, Jonathan H.; Sanders, Albert E.

doi:10.1023/a:1025552007291

Cited by 179 publications

(67 citation statements)

References 92 publications

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“…The interrelationships among the three families within Delphinoidea were disputed and several alternative branching patterns were proposed [2,5,7,17,19,20,29,31,33,64,65,70,83]. While several morphological and molecular studies agreed that a close relationship existed between Delphinidae and Phocoenidae [2,7,17,29], other molecular analyses supported the sister relationship of Monodontidae and Phocoenidae [12,13,19,20,33,65,70,83].…”

Section: Discussionmentioning

confidence: 99%

“…While several morphological and molecular studies agreed that a close relationship existed between Delphinidae and Phocoenidae [2,7,17,29], other molecular analyses supported the sister relationship of Monodontidae and Phocoenidae [12,13,19,20,33,65,70,83]. Besides these hypotheses, an unresolved relationship between the three families was mentioned in some studies [5,29,31,64].…”

Section: Discussionmentioning

confidence: 99%

“…The phylogeny of Cetacea has long attracted interest of evolutionary biologists and has been investigated using both morphological (including fossil) and molecular data [2-33]. Some of the issues have been well resolved including the monophyly of Cetacea [5,12-17,19-22] and its sister relationship with Hippoptamidae [10,12,13,22-24]. However, these studies left unresolved issues: 1) the phylogenetic relationships of some major cetacean lineages; 2) the systematic status and phylogenetic position of some taxa such as the Ganges River dolphin or susu ( Platanista gangetica ) and the now nearly extinct Yangtze river dolphin or Baiji ( Lipotes vexillifer ), as well as those between the three delphinoid families: Monodontidae (narwhals and belugas), Phocoenidae (porpoises) and Delphinidae (dolphins) (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

“…However, these studies left unresolved issues: 1) the phylogenetic relationships of some major cetacean lineages; 2) the systematic status and phylogenetic position of some taxa such as the Ganges River dolphin or susu ( Platanista gangetica ) and the now nearly extinct Yangtze river dolphin or Baiji ( Lipotes vexillifer ), as well as those between the three delphinoid families: Monodontidae (narwhals and belugas), Phocoenidae (porpoises) and Delphinidae (dolphins) (Figure 1). The phylogenetic relationships among the various river dolphin genera ( Inia , Pontoporia , Platanista , Lipotes ) remain controversial, despite that a variety of studies have been conducted using a diverse array of systematic markers [12,17,31,33], even in large concatenations of data [10]. The now nearly extinct Lipotes has been difficult to classify especially with respect to Inia and Pontoporia [12,31].…”

Section: Introductionmentioning

confidence: 99%

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Whale phylogeny and rapid radiation events revealed using novel retroposed elements and their flanking sequences

Chen

Zhou

et al. 2011

BMC Evol Biol

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BackgroundA diversity of hypotheses have been proposed based on both morphological and molecular data to reveal phylogenetic relationships within the order Cetacea (dolphins, porpoises, and whales), and great progress has been made in the past two decades. However, there is still some controversy concerning relationships among certain cetacean taxa such as river dolphins and delphinoid species, which needs to be further addressed with more markers in an effort to address unresolved portions of the phylogeny.ResultsAn analysis of additional SINE insertions and SINE-flanking sequences supported the monophyly of the order Cetacea as well as Odontocete, Delphinoidea (Delphinidae + Phocoenidae + Mondontidae), and Delphinidae. A sister relationship between Delphinidae and Phocoenidae + Mondontidae was supported, and members of classical river dolphins and the genera Tursiops and Stenella were found to be paraphyletic. Estimates of divergence times revealed rapid divergences of basal Odontocete lineages in the Oligocene and Early Miocene, and a recent rapid diversification of Delphinidae in the Middle-Late Miocene and Pliocene within a narrow time frame.ConclusionsSeveral novel SINEs were found to differentiate Delphinidae from the other two families (Monodontidae and Phocoenidae), whereas the sister grouping of the latter two families with exclusion of Delphinidae was further revealed using the SINE-flanking sequences. Interestingly, some anomalous PCR amplification patterns of SINE insertions were detected, which can be explained as the result of potential ancestral SINE polymorphisms and incomplete lineage sorting. Although a few loci were potentially anomalous, this study demonstrated that the SINE-based approach is a powerful tool in phylogenetic studies. Identifying additional SINE elements that resolve the relationships in the superfamily Delphinoidea and family Delphinidae will be important steps forward in completely resolving cetacean phylogenetic relationships in the future.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Whale phylogeny and rapid radiation events revealed using novel retroposed elements and their flanking sequences

Chen

Zhou

et al. 2011

BMC Evol Biol

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“…The inclusion of Squalodontidae and Waipatiidae in Platanistoidea, as suggested by Muizon (1984), Muizon (1987), Muizon (1988a), Muizon (1994) and Fordyce (1994), have been more heavily debated (Lambert, Bianucci & Urbina, 2014; Tanaka & Fordyce, 2015a). Until now, no comprehensive phylogenetic analysis has used a taxonomic sampling that includes all putative platanistoid lineages, along with appropriate outgroups, such as Delphinida and stem Odontoceti (Tanaka & Fordyce, 2015a; Kimura & Barnes, 2016; Lambert, Bianucci & Urbina, 2014; Geisler & Sanders, 2003; Geisler et al, 2011). …”

Section: Introductionmentioning

confidence: 99%

Arktocara yakataga, a new fossil odontocete (Mammalia, Cetacea) from the Oligocene of Alaska and the antiquity of Platanistoidea

Boersma

Pyenson

2016

PeerJ

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The diversification of crown cetacean lineages (i.e., crown Odontoceti and crown Mysticeti) occurred throughout the Oligocene, but it remains an ongoing challenge to resolve the phylogenetic pattern of their origins, especially with respect to stem lineages. One extant monotypic lineage, Platanista gangetica (the Ganges and Indus river dolphin), is the sole surviving member of the broader group Platanistoidea, with many fossil relatives that range from Oligocene to Miocene in age. Curiously, the highly threatened Platanista is restricted today to freshwater river systems of South Asia, yet nearly all fossil platanistoids are known globally from marine rocks, suggesting a marine ancestry for this group. In recent years, studies on the phylogenetic relationships in Platanistoidea have reached a general consensus about the membership of different sub-clades and putative extinct groups, although the position of some platanistoid groups (e.g., Waipatiidae) has been contested. Here we describe a new genus and species of fossil platanistoid, Arktocara yakataga, gen. et sp. nov. from the Oligocene of Alaska, USA. The type and only known specimen was collected from the marine Poul Creek Formation, a unit known to include Oligocene strata, exposed in the Yakutat City and Borough of Southeast Alaska. In our phylogenetic analysis of stem and node-based Platanistoidea, Arktocara falls within the node-based sub-clade Allodelphinidae as the sister taxon to Allodelphis pratti. With a geochronologic age between ∼29–24 million years old, Arktocara is among the oldest crown Odontoceti, reinforcing the long-standing view that the diversification for crown lineages must have occurred no later than the early Oligocene.

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Morphology

2016

Cetacean Paleobiology

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Cited by 179 publications

References 92 publications

Whale phylogeny and rapid radiation events revealed using novel retroposed elements and their flanking sequences

Whale phylogeny and rapid radiation events revealed using novel retroposed elements and their flanking sequences

Arktocara yakataga, a new fossil odontocete (Mammalia, Cetacea) from the Oligocene of Alaska and the antiquity of Platanistoidea

Morphology

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