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A new early Pliocene species of Mesoplodon: a calibration mark for the radiation of this species-rich beaked whale genus

Olivier Lambert and Stephen Louwye UGent (2016) JOURNAL OF VERTEBRATE PALEONTOLOGY. 36(2).
abstract
Including at least 15 extant species, the beaked whale genus Mesoplodon (Cetacea, Odontoceti, Ziphiidae) is by far the most species-rich cetacean genus. Such a high diversity reflects one or several pulses of radiation, most likely involving a sexual selection mechanism affecting shape, size, and position of mandibular tusks. However, the tempo of this diversification is currently poorly constrained due to the scarce fossil record. Based on the reassessment of five partial skulls discovered in Antwerp (north of Belgium), a new fossil species of the genus Mesoplodon, M. posti, sp. nov., is described. Only the second fossil species of the genus currently recognized, it is characterized (among other features) by: transverse sections of the rostrum higher than wide (a feature proposed to correspond to the presence of lower tusks more posterior than the apex of the mandibles); the presence of a basirostral groove at the rostrum base; pentagonal joined nasals; the posterior projection of the premaxilla in the vertex shorter than the nasal backward; and a strong transverse compression of the frontals behind the nasals. Our phylogenetic analysis results in M. posti being nested among extant species of Mesoplodon. Palynological study of the organic-walled phytoplankton from sediment retained in cranial cavities of several specimens indicates an age between 4.86 and 3.9Ma (Zanclean, early Pliocene). Constituting the first temporally well-constrained fossil species of Mesoplodon, M. posti provides an upper calibration point for the beginning of the radiation(s), having produced a surprisingly high number of extant species in this genus.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
DINOFLAGELLATE CYST STRATIGRAPHY, NORTH-SEA BASIN, FAMILY ZIPHIIDAE, MIDDLE MIOCENE, CETACEA, BELGIUM, ODONTOCETI, ATLANTIC, PALEOECOLOGY, RESURRECTION
journal title
JOURNAL OF VERTEBRATE PALEONTOLOGY
J. Vertebr. Paleontol.
volume
36
issue
2
article number
e1055754
pages
10 pages
Web of Science type
Article
Web of Science id
000372953300009
JCR category
PALEONTOLOGY
JCR impact factor
2.114 (2016)
JCR rank
8/53 (2016)
JCR quartile
1 (2016)
ISSN
0272-4634
DOI
10.1080/02724634.2015.1055754
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
7229246
handle
http://hdl.handle.net/1854/LU-7229246
date created
2016-05-26 13:45:52
date last changed
2016-12-21 15:42:50
@article{7229246,
  abstract     = {Including at least 15 extant species, the beaked whale genus Mesoplodon (Cetacea, Odontoceti, Ziphiidae) is by far the most species-rich cetacean genus. Such a high diversity reflects one or several pulses of radiation, most likely involving a sexual selection mechanism affecting shape, size, and position of mandibular tusks. However, the tempo of this diversification is currently poorly constrained due to the scarce fossil record. Based on the reassessment of five partial skulls discovered in Antwerp (north of Belgium), a new fossil species of the genus Mesoplodon, M. posti, sp. nov., is described. Only the second fossil species of the genus currently recognized, it is characterized (among other features) by: transverse sections of the rostrum higher than wide (a feature proposed to correspond to the presence of lower tusks more posterior than the apex of the mandibles); the presence of a basirostral groove at the rostrum base; pentagonal joined nasals; the posterior projection of the premaxilla in the vertex shorter than the nasal backward; and a strong transverse compression of the frontals behind the nasals. Our phylogenetic analysis results in M. posti being nested among extant species of Mesoplodon. Palynological study of the organic-walled phytoplankton from sediment retained in cranial cavities of several specimens indicates an age between 4.86 and 3.9Ma (Zanclean, early Pliocene). Constituting the first temporally well-constrained fossil species of Mesoplodon, M. posti provides an upper calibration point for the beginning of the radiation(s), having produced a surprisingly high number of extant species in this genus.},
  articleno    = {e1055754},
  author       = {Lambert, Olivier and Louwye, Stephen},
  issn         = {0272-4634},
  journal      = {JOURNAL OF VERTEBRATE PALEONTOLOGY},
  keyword      = {DINOFLAGELLATE CYST STRATIGRAPHY,NORTH-SEA BASIN,FAMILY ZIPHIIDAE,MIDDLE MIOCENE,CETACEA,BELGIUM,ODONTOCETI,ATLANTIC,PALEOECOLOGY,RESURRECTION},
  language     = {eng},
  number       = {2},
  pages        = {10},
  title        = {A new early Pliocene species of Mesoplodon: a calibration mark for the radiation of this species-rich beaked whale genus},
  url          = {http://dx.doi.org/10.1080/02724634.2015.1055754},
  volume       = {36},
  year         = {2016},
}

Chicago
Lambert, Olivier, and Stephen Louwye. 2016. “A New Early Pliocene Species of Mesoplodon: a Calibration Mark for the Radiation of This Species-rich Beaked Whale Genus.” Journal of Vertebrate Paleontology 36 (2).
APA
Lambert, O., & Louwye, S. (2016). A new early Pliocene species of Mesoplodon: a calibration mark for the radiation of this species-rich beaked whale genus. JOURNAL OF VERTEBRATE PALEONTOLOGY, 36(2).
Vancouver
1.
Lambert O, Louwye S. A new early Pliocene species of Mesoplodon: a calibration mark for the radiation of this species-rich beaked whale genus. JOURNAL OF VERTEBRATE PALEONTOLOGY. 2016;36(2).
MLA
Lambert, Olivier, and Stephen Louwye. “A New Early Pliocene Species of Mesoplodon: a Calibration Mark for the Radiation of This Species-rich Beaked Whale Genus.” JOURNAL OF VERTEBRATE PALEONTOLOGY 36.2 (2016): n. pag. Print.