Under Construction

Mysticeti

Baleen whales

Michel C. Milinkovitch and Olivier Lambert
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
Humpback whale
taxon links [up-->]Balaenidae [up-->]Balaenopteridae extinct icon extinct icon extinct icon extinct icon extinct icon Not MonophyleticPhylogenetic position of group is uncertain and group is not monophyleticPhylogenetic position of group is uncertain and group is not monophyletic[down<--]Cetacea Interpreting the tree
close box

This tree diagram shows the relationships between several groups of organisms.

The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.

example of a tree diagram

You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.

For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.

close box
Containing group: Cetacea

Introduction

All living mysticetes are large filter-feeders although the exact means by which baleens are used vary among species (gulp-feeding for balaenopterids, skim-feeding for balaenids, and bottom ploughing for eschrichtiids).

Characteristics

The morphological modifications linked to filter-feeding are:

Discussion of Phylogenetic Relationships

The relationships among extinct and extant groups of mysticetes have been less extensively studied than the relationships among odontocetes. Four families are currently recognized: Balaenidae, Balaenopteridae, the Neobalaenidae (including a single extant species, the pygmy right whale, Caperea marginata), and the Eschrichtiidae (including a single extant species, the gray whale, Eschrichtius robustus).

Some molecular analyses positioned the skim-feeding balaenids (right whales) as the basal lineage of extant mysticetes (e.g., Arnason and Gulberg, 1994, 1996; Gatesy 1998). Uncertainty remains regarding the phylogenetic position of neobalaenids: Caperea might be the sister group to balaenopterids (rorquals) and Eschrichtius (gray whale) (Arnason and Gulberg 1994), or to balaenids (Gatesy 1998). This latter hypothesis is also supported by the morphological studies of McLeod et al. (1993) and Bisconti (2000).

Discussion of some problematic extinct groups

Several fossil groups of mysticetes (e.g., Aetiocetidae and Cetotheriidae) are still taxonomically problematic; it is very likely that some of them form paraphyletic groups. Systematic revisions, additional anatomical data and cladistic analyses will be required before reaching reasonable hypotheses regarding the phylogeny of these groups.

Other Names for Mysticeti

References

Arnason, U. and A. Gullberg. 1994. Relationship of baleen whales established by cytochrome-b gene sequence comparison. Nature 367:726-728.

Arnason, U. and A. Gullberg. 1996. Cytochrome b nucleotide sequences and the identification of five primary lineages of extant cetaceans. Molecular Biology and Evolution 13:407-417.

Barnes, L. G., Kimura, M., Furusawa, H., and Sawamura, H. 1994. Classification and distribution of Oligocene Aetiocetidae (Mammalia; Cetacea; Mysticeti) from western North America and Japan. The Island Arc 3: 392-431.

Bisconti, M. 2000. New description, character analysis and preliminary phyletic assessment of two Balaenidae skulls from the Italian Pliocene. Palaeontographia Italica 87: 37-66.

Bouetel, V. and Muizon, C. de, 2006. The anatomy and relationships of Piscobalaena nana (Cetacea, Mysticeti), a Cetotheriidae s.s. from the early Pliocene of Peru. Geodiversitas 28(2): 319-395.

Fordyce, R. E. 1981. Systematics of the odontocete whale Agorophius pygmaeus and the family Agorophiidae (Mammalia: Cetacea). Journal of Paleontology 55(5): 1028-1045.

Fordyce, R. E. 2002. Simocetus rayi (Odontoceti: Simocetidae) (new species, new genus, new family), a bizarre new archaic Oligocene dolphin from the eastern North Pacific. Smithsonian Contributions to Paleobiology 93: 185-222.

Fordyce, R. E. and L. G. Barnes. 1994. The evolutionary history of whales and dolphins. Annual Review of Earth and Planetary Sciences 22:419-455.

Gatesy, J. 1998. Molecular evidence for the phylogenetic affinities of Cetacea. pp. 63-112 in: Thewissen J.G.M. (ed.), The Emergence of Whales: Evolutionary Patterns in the Origin of Cetacea , Plenum, New York.

Kimura, T. and Ozawa, T. 2002. A new cetothere (Cetacea: Mysticeti) from the Early Miocene of Japan. Journal of Vertebrate Paleontology 22(3): 684-702.

McLeod, S. A., Whitmore, F. C., Jr., and Barnes, L. G. 1993. Evolutionary relationships and classification. pp. 45-70 in: Burns, J. J., Montague, J. J., and Cowles, C. J. (eds). The Bowhead whale, The Society for Marine Mammalogy, Special Publication, 2.

Nikaido, M., H. Hamilton, H. Makino, T. Sasaki, K. Takahashi, M. Goto, N. Kanda, L. A. Pastene, and N. Okada. 2006. Baleen Whale Phylogeny and a Past Extensive Radiation Event Revealed by SINE Insertion Analysis. Mol. Biol. Evol. 23:866–873.

Rothausen, K. 1968. Die systematische Stellung der europäischen Squalodontidae (Odontoceti, Mammalia). Paläontologische Zeischrift 42: 83-104.

Rychel, A. L., T. W. Reeder, and A. Berta. 2004. Phylogeny of mysticete whales based on mitochondrial and nuclear data. Mol. Phylogenet. Evol. 32:892–901.

Sasaki, T., M. Nikaido, H. Healy et al. 2005. Mitochondrial phylogenetics and evolution of mysticete whales. Syst. Biol. 56:77–90.

Information on the Internet

Title Illustrations
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
Humpback whale
Scientific Name Megaptera novaeangliae
Location Gerlache Strait (Antarctica)
Comments Humpback whale (Balaenopteridae).
Creator Photograph by Gerald and Buff Corsi
Specimen Condition Live Specimen
Source Collection CalPhotos
Copyright © 2001 California Academy of Sciences
About This Page

Michel C. Milinkovitch
Genetics & Evolution, University of Geneva

Olivier Lambert
Royal Institute of Natural Sciences (Belgium)

Correspondence regarding this page should be directed to Michel C. Milinkovitch at

All Rights Reserved.

Citing this page:

Milinkovitch, Michel C. and Olivier Lambert. 2006. Mysticeti. Baleen whales. Version 07 August 2006 (under construction). http://tolweb.org/Mysticeti/16024/2006.08.07 in The Tree of Life Web Project, http://tolweb.org/

edit this page
close box

This page is a Tree of Life Branch Page.

Each ToL branch page provides a synopsis of the characteristics of a group of organisms representing a branch of the Tree of Life. The major distinction between a branch and a leaf of the Tree of Life is that each branch can be further subdivided into descendent branches, that is, subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

close box

Mysticeti

Page Content

articles & notes

collections

people

Explore Other Groups

random page

  go to the Tree of Life home page
top