Journal of Mammalian Evolution

, Volume 18, Issue 2, pp 77–100 | Cite as

The More the Merrier? A Large Cladistic Analysis of Mysticetes, and Comments on the Transition from Teeth to Baleen

Original Paper

Abstract

The origin of baleen whales, and their specialized mode of filter-feeding, marks an important event in the evolutionary history of mammals that gave rise to one of the most distinctive groups of animals alive today. Recent years have seen the description of a number of important new specimens, as well as the publication of a large number of phylogenetic analyses. Yet, despite this great effort, a broad consensus on even the most fundamental relationships within this group has so far remained elusive, a fact perhaps most strikingly reflected in the ongoing debate regarding the taxonomic placement of the extant gray and pygmy right whales, as well as the question of the relative closeness of relationship of all the extant members of the mysticete crown group. Here, I present the taxonomically most comprehensive phylogenetic analysis of extinct and extant baleen whales carried out to date, based on morphological data and utilizing both maximum parsimony and Bayesian methodologies. The results of this study were well resolved and consistent across methodologies. Apart from recovering a clade comprising the pygmy right whale, gray whales, and rorquals, a grouping new to morphological analyses but supported by a number of molecular studies, this investigation also revealed the former clade to be more closely related to a large number of extinct species than to right whales, thus contradicting previous notions of a closely related mysticete crown group. In addition, this analysis also identified a novel clade comprising nearly all the described archaic toothed mysticetes from the late Oligocene (about 23–28 Ma) to the exclusion of all toothless mysticetes. This finding is consistent with a basic assessment of the functional morphology of toothed mysticete vision, and may have implications for the evolution of mysticete filter-feeding and the recently proposed interpretation of some of these archaic taxa as transitional forms possessing both teeth and baleen at the same time.

Keywords

Cetacea Mysticeti Baleen whale Evolution Phylogeny Cladistic Bayesian 

Supplementary material

10914_2010_9148_MOESM1_ESM.doc (152 kb)
ESM 1(DOC 152 kb)
10914_2010_9148_MOESM3_ESM.txt (15 kb)
Data matrix(TXT 15 kb)
10914_2010_9148_Fig6_ESM.gif (99 kb)
Supplementary Fig S1

State frequency distributions of six characters relying on assessments of size of one structure relative to another in the absence of any clear points of reference. Because of the often fragmentary and distorted nature of cetacean fossil material, many of the measurements may be approximations and not entirely accurate, which is why it was decided to use discrete character states, rather than the actual measurements. Measurements were binned into 5% intervals and the final discrete character states delimited by visual inspection. (GIF 98 kb)

10914_2010_9148_MOESM2_ESM.eps (1.4 mb)
High Resolution Image (EPS 1386 kb)

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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of Earth SciencesUniversity of BristolBristolUK
  2. 2.Department of GeologyUniversity of OtagoDunedinNew Zealand

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