Anatomy and phylogeny of the large shark-toothed dolphin<i>Phoberodon arctirostris</i>Cabrera, 1926 (Cetacea: Odontoceti) from the early Miocene of Patagonia (Argentina)

Viglino, Mariana; Buono, Mónica Romina; Fordyce, R. Ewan; Cuitiño, José Ignacio; Fitzgerald, Erich M. G.

doi:10.1093/zoolinnean/zly053

Cited by 22 publications

(31 citation statements)

References 63 publications

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“…Eosqualodon further differs from MSNUP I-16944 in its pattern of dental ornamentation, which consists of stronger and less closely spaced ridges and sulci. MSNUP I-16944 also clearly differs from the South American form Phoberodon, in which the third upper incisor is curved lingually (with the apex pointing medially) and the upper canine and anteriormost cheek teeth exhibit widely separated enamel striations (VIGLINO et al, 2018). By contrast, MSNUP I-16944 closely matches the morphology of Squalodon, which is known from several specimens of the Euromediterranean region (Fig.…”

Section: Figs 2 -3mentioning

confidence: 71%

“…Dental wear is ubiquitous in form of apical wear facets, here interpreted as attritional. MSNUP I-16944 is attributed to Squalodontidae owing to the observation of large, procumbent incisors, whose crowns display gentle longitudinal fluting of the dental enamel, with the root of I 1 being placed dorsal to that of I 2 (e.g., DOO-LEY, 1998;MARX et al, 2016;MUIZON et al, 2018;VIGLINO et al, 2018). Four genera of Squalodontidae are currently represented by diagnostic material: Squalodon, Eosqualodon, Phoberodon, and Kelloggia (a possible junior synonym of Squalodon;MUIZON, 2001) (MARX et al, 2016;MUIZON et al, 2018); recently, however, Phoberodon has been recognized as a stem odontocete or an early-diverging platanistoid not closely related to the squalodontids (VIGLINO et al, 2018).…”

Section: Figs 2 -3mentioning

confidence: 99%

“…MSNUP I-16944 is attributed to Squalodontidae owing to the observation of large, procumbent incisors, whose crowns display gentle longitudinal fluting of the dental enamel, with the root of I 1 being placed dorsal to that of I 2 (e.g., DOO-LEY, 1998;MARX et al, 2016;MUIZON et al, 2018;VIGLINO et al, 2018). Four genera of Squalodontidae are currently represented by diagnostic material: Squalodon, Eosqualodon, Phoberodon, and Kelloggia (a possible junior synonym of Squalodon;MUIZON, 2001) (MARX et al, 2016;MUIZON et al, 2018); recently, however, Phoberodon has been recognized as a stem odontocete or an early-diverging platanistoid not closely related to the squalodontids (VIGLINO et al, 2018). Whereas the mesorostral groove of MSNUP I-16944 is widely open dorsally at the level of the root of the first upper postcanine left tooth, the mesorostral groove of the European form Eosqualodon is almost completely roofed by the medial portion of the premaxillae from the apex of the rostrum to a much more posterior level (personal observation on Eosqualodon langewieschei).…”

Section: Figs 2 -3mentioning

confidence: 99%

“…For a long time, these longirostrine toothed whales have been regarded as members of the crown Odontoceti clade, in the superfamily Platanistoidea, which also includes the South Asian river dolphin Platanista gangetica (e.g., MUIZON, 1991MUIZON, , 1994FORDYCE, 1994;FORDYCE & MUIZON, 2001;TANAKA & FORDYCE, 2016); now however, many phylogenetic analyses recover squalodontids as late-branching stem odontocetes (e.g., GEISLER & SANDERS 2003;TANAKA & FOR-DYCE, 2014;CHURCHILL et al, 2016;BIANUCCI et al, 2018a). The current lack of consensus upon the phylogenetic position of the squalodontids is highlighted by the observation that several recent papers dealing with the affinities of the heterodont long-snouted toothed whales present both the aforementioned solutions as plausible (e.g., TANAKA & FORDYCE, 2015a, 2015bLAMBERT et al, 2018;MUIZON et al, 2018;VIGLINO et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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The shark-toothed dolphin Squalodon (Cetacea: Odontoceti) from the remarkable Montagna della Majella marine vertebrate assemblage (Bolognano Formation, central Italy)

Collareta¹,

Cencio²,

Ricci³

et al. 2020

Carnets Geol.

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T Th he e s sh ha ar rk k--t to oo ot th he ed d d do ol lp ph hi in n S Sq qu ua al lo od do on n ( (C Ce et ta ac ce ea a: : O Od do on nt to oc ce et ti i) ) f fr ro om m t th he e r re em ma ar rk ka ab bl le e M Mo on nt ta ag gn na a d de el ll la a M Ma aj je el ll la a m ma ar ri in ne e v ve er rt te eb br ra at te e a as ss se em mb bl la ag ge e ( (B Bo ol lo og gn na an no o F Fo or rm ma at ti io on n, , c ce en nt tr ra al l I It ta al ly y) )Abstract: The extinct family Squalodontidae consists of heterodont, medium-sized odontocetes, featuring a long rostrum that houses large, procumbent incisors and heavily ornamented postcanine teeth carrying accessory denticles, hence their vernacular name, "shark-toothed dolphins". These longirostrine toothed whales are often seen as bridging the anatomical gap between archaic Oligocene odontocetes and their late Miocene to Holocene relatives. Possibly among the major marine predators of their time, the shark-toothed dolphins are important components of several lower Miocene marine-mammal assemblages from the North Atlantic and Mediterranean/Paratethysian realms. In the present work, a partial skull of Squalodontidae is described from the strata of the Bolognano Formation cropping out in the northeastern sector of the Montagna della Majella massif (Abruzzo, central Italy), which has previously yielded a rich lower Miocene marine-vertebrate assemblage, including eleven taxa of elasmobranchs as well as subordinate teleosts and very fragmentary remains of marine reptiles and mammals. The specimen consists of the anterodorsal portion of a rostrum, preserving parts of both premaxillae and left maxilla, and the anteriormost seven upper left teeth. This partial skull is here identified as belonging to the genus Squalodon, whose presence in the Montagna della Majella vertebrate assemblage had already been tentatively proposed on the basis of two fragmentary teeth. The paleontological significance of this find is discussed in the broader framework of the Euromediterranean record of Squalodon.

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Section: Figs 2 -3mentioning

confidence: 71%

Section: Figs 2 -3mentioning

confidence: 99%

Section: Figs 2 -3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The shark-toothed dolphin Squalodon (Cetacea: Odontoceti) from the remarkable Montagna della Majella marine vertebrate assemblage (Bolognano Formation, central Italy)

Collareta¹,

Cencio²,

Ricci³

et al. 2020

Carnets Geol.

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“…The latter has already been found to be correlated with skull shape (McCurry and Pyenson 2018), and we suggest that paleoecology is the primary driving factor here. It is also noteworthy that during the late Oligocene-early Miocene, a variety of rostra and associated tooth morphologies among platanistoids coexisted (Tanaka and Fordyce 2017;Viglino et al 2018aViglino et al , 2020Bianucci et al 2020), implying a range of feeding strategies existed within Platanistoidea, similar to extant odontocetes (Werth 2006;Hocking et al 2017a,b).…”

Section: Cochlear Evolution In Platanistoideamentioning

confidence: 99%

Hearing from the ocean and into the river: the evolution of the inner ear of Platanistoidea (Cetacea: Odontoceti)

Viglino¹,

Gaetán²,

Buono³

et al. 2021

Paleobiology

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The inner ear of the two higher clades of modern cetaceans (Neoceti) is highly adapted for hearing infrasonic (mysticetes) or ultrasonic (odontocetes) frequencies. Within odontocetes, Platanistoidea comprises a single extant riverine representative, Platanista gangetica, and a diversity of mainly extinct marine species from the late Oligocene onward. Recent studies drawing on features including the disparate tympanoperiotic have not yet provided a consensus phylogenetic hypothesis for platanistoids. Further, cochlear morphology and evolutionary patterns have never been reported. Here, we describe for the first time the inner ear morphology of late Oligocene–early Miocene extinct marine platanistoids and their evolutionary patterns. We initially hypothesized that extinct marine platanistoids lacked a specialized inner ear like P. gangetica and thus, their morphology and inferred hearing abilities were more similar to those of pelagic odontocetes. Our results reveal there is no “typical” platanistoid cochlear type, as the group displays a disparate range of cochlear anatomies, but all are consistent with high-frequency hearing. Stem odontocete Prosqualodon australis and platanistoid Otekaikea huata present a tympanal recess in their cochlea, of yet uncertain function in the hearing mechanism in cetaceans. The more basal morphology of Aondelphis talen indicates it had lower high-frequency hearing than other platanistoids. Finally, Platanista has the most derived cochlear morphology, adding to evidence that it is an outlier within the group and consistent with a >9-Myr-long separation from its sister genus Zarhachis. The evolution of a singular sound production morphology within Platanistidae may have facilitated the survival of Platanista to the present day.

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First Toothless Platanistoid from the Early Miocene of Patagonia: the Golden Age of Diversification of the Odontoceti

et al. 2020

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Anatomy and phylogeny of the large shark-toothed dolphinPhoberodon arctirostrisCabrera, 1926 (Cetacea: Odontoceti) from the early Miocene of Patagonia (Argentina)

Cited by 22 publications

References 63 publications

The shark-toothed dolphin Squalodon (Cetacea: Odontoceti) from the remarkable Montagna della Majella marine vertebrate assemblage (Bolognano Formation, central Italy)

The shark-toothed dolphin Squalodon (Cetacea: Odontoceti) from the remarkable Montagna della Majella marine vertebrate assemblage (Bolognano Formation, central Italy)

Hearing from the ocean and into the river: the evolution of the inner ear of Platanistoidea (Cetacea: Odontoceti)

First Toothless Platanistoid from the Early Miocene of Patagonia: the Golden Age of Diversification of the Odontoceti

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