Out of the Pacific: a second fossil porpoise from the Pliocene of the North Sea Basin

Colpaert, Wouter; Bosselaers, Mark; Lambert, Olivier

doi:10.4202/app.00115.2014

Cited by 7 publications

(13 citation statements)

References 27 publications

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“…The topology is similar in pattern with those of , in which Pterophocaena nishinoi is reconstructed as the earliest diverging phocoenid; all phocoenids from Hokkaido are placed as a clade; Lomacetus and Australithax as a clade; and extant species as monophyletic. Colpaert et al (2015) reconstructed Pterophocaena nishinoi basal to all phocoenids as similar to this study, but among an unresolved polytomy with Delphinodon dividum and Kentriodon pernix. Both in our study and the Murakami studies, just crownward from Pterophocaena nishinoi, a clade of Archaeophocaena teshioensis and Miophocaena nishinoi are recovered.…”

Section: Phylogenetic Analysissupporting

confidence: 69%

“…The result of the phylogenetic analysis in our study is compared with previous studies (e.g., Racicot et al, 2014;Colpaert et al, 2015). The topology is similar in pattern with those of , in which Pterophocaena nishinoi is reconstructed as the earliest diverging phocoenid; all phocoenids from Hokkaido are placed as a clade; Lomacetus and Australithax as a clade; and extant species as monophyletic.…”

Section: Phylogenetic Analysissupporting

confidence: 62%

“…Both in our study and the Murakami studies, just crownward from Pterophocaena nishinoi, a clade of Archaeophocaena teshioensis and Miophocaena nishinoi are recovered. Colpaert et al (2015) placed A. teshioensis and Miophocaena nishinoi with Semirostrum ceruttii as an unresolved polytomy. This study shows an unresolved polytomy, which includes Salumiphocaena + P. tedfordi + P. longirostris + (Septemtriocetus + Brabocetus + Semirostrum) + an extant clade.…”

Section: Phylogenetic Analysismentioning

confidence: 99%

“…Since 2000, fossil phocoenid study has been progressed dramatically (Ichishima and Kimura, 2000, 2013Racicot et al, 2014;Colpaert et al, 2015). Fossil phocoenids have long been known only from the eastern and southern Pacific since the study of Salumiphocaena stocktoni from the late Miocene of California by Wilson (1973), a series of Piscolithax spp reported from Peru and Mexico (de Muizon, 1983;Barnes, 1984a), and an isolated periotic described from the late Miocene of New Zealand (Fordyce, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a phocoenid with a unique feeding apparatus was reported from California (Boessenecker, 2013;Racicot et al, 2014). Now, a few specimens have been known from the Atlantic Colpaert et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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A new skull of the fossil porpoise Numataphocoena yamashitai (Cetacea: Phocoenidae) from the upper part of the Horokaoshirarika Formation (lower Pliocene), Numata Town, Hokkaido, Japan, and its phylogenetic position

Tanaka¹,

Ichishima

2016

Palaeontologia Electronica

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Section: Phylogenetic Analysissupporting

confidence: 69%

Section: Phylogenetic Analysissupporting

confidence: 62%

Section: Phylogenetic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A new skull of the fossil porpoise Numataphocoena yamashitai (Cetacea: Phocoenidae) from the upper part of the Horokaoshirarika Formation (lower Pliocene), Numata Town, Hokkaido, Japan, and its phylogenetic position

Tanaka¹,

Ichishima

2016

Palaeontologia Electronica

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A natural endocast of an early Miocene odontocete and its implications in cetacean brain evolution

Bisconti

Damarco

Tartarelli

et al. 2020

J of Comparative Neurology

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The natural endocast Museo di Geologia e Paleontologia of the Università degli Studi di Torino (MGPT)‐PU 13873 is described and analyzed in order to interpret its taxonomic affinities and its potential significance on our understanding of cetacean brain evolution. The endocast is from the early Miocene of Piedmont (between ca. 19 and 16 million years ago), Northwestern Italy, and shows a number of plesiomorphic characters. These include: scarcely rounded cerebral hemispheres, cerebellum exposed in dorsal view with little superimposition by the cerebral hemispheres, short temporal lobe, and long sylvian fissure. The distance between the hypophysis and the rostral pons is particularly high, as it was determined by the calculus of the hypothalamus quotient, suggesting that the development of a deep interpeduncular fossa was not as advanced as in living odontocetes. The encephalization quotient (EQ) of MGPT‐PU 13873 is ~1.81; therefore, this specimen shows an EQ in line with other fossil whales of the same geological age (early Miocene). Comparative analysis shows that there is a critical lack of data from the late Miocene and Pliocene that prevents us to fully understand the recent evolution of the EQ diversity in whales. Moreover, the past diversity of brain size and shape in mysticetes is virtually unknown. All these observations point to the need of additional efforts to uncover evolutionary patterns and processes on cetacean brain evolution.

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First monodontid cetacean (Odontoceti, Delphinoidea) from the early Pliocene of the north‐western Pacific Ocean

Ichishima

Furusawa

Makino

et al. 2018

Papers in Palaeontology

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Monodontids are among the most enigmatic cetaceans due to their scarcity in the fossil record. Previously, except for fragmentary materials, only three skulls were known from the pre‐Pleistocene; these came from the east coast of the Pacific and both east and west coasts of the Atlantic. Haborodelphis japonicus, a new early Pliocene monodontid cetacean from the north‐west Pacific, significantly expands the palaeobiogeographical extent of the ancestral monodontids. The new taxon differs from all other monodontids in the following character states: the robust postorbital process for the skull size; the short rostrum relative to the whole skull length; the anterior dorsal infraorbital foramina posterior to the level of the antorbital notch; the premaxillary foramen on the level of the antorbital notch; the dorsally gently convex premaxillary sac fossa; the palatines wedged into the maxillae anteriorly on the midline; and the presence of the clearly excavated posteromedial sulcus. Monodontids were almost certainly adapted to warmer waters than their living counterparts Delphinapterus leucas and Monodon monoceros, both of which are confined to the high latitudes of the northern hemisphere. However, closer inspection (based mainly on fossil invertebrates) of the palaeoenvironments from which the monodontid fossils were produced, reveals that they may have preferred cooler conditions than previously thought. Due to the short climatic fluctuation cycles during the Pliocene in the northern hemisphere, and the increase of heterogeneity and regionality of the coastal environments, the dating of layers within a formation is critical for understanding palaeoenvironment in terms of the sea surface temperatures.

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Out of the Pacific: a second fossil porpoise from the Pliocene of the North Sea Basin

Abstract: Although modern porpoises (Phocoenidae, Odontoceti, Cetacea)

Cited by 7 publications

References 27 publications

A new skull of the fossil porpoise Numataphocoena yamashitai (Cetacea: Phocoenidae) from the upper part of the Horokaoshirarika Formation (lower Pliocene), Numata Town, Hokkaido, Japan, and its phylogenetic position

A new skull of the fossil porpoise Numataphocoena yamashitai (Cetacea: Phocoenidae) from the upper part of the Horokaoshirarika Formation (lower Pliocene), Numata Town, Hokkaido, Japan, and its phylogenetic position

A natural endocast of an early Miocene odontocete and its implications in cetacean brain evolution

First monodontid cetacean (Odontoceti, Delphinoidea) from the early Pliocene of the north‐western Pacific Ocean

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