What is a Suiforme (Artiodactyla)? Contribution of cranioskeletal and mitochondrial DNA data.

Suiformes (Artiodactyla) traditionally includes three families: Suidae, Tayassuidae, and Hippopotamidae but the monophyly of this suborder has recently been questioned from molecular data. A maximum parsimony analysis of molecular, morphological, and combined data was performed on the same set of taxa including representatives of the three Artiodactyla suborders (Suiformes, Ruminantia, and Tylopoda) and Perissodactyla as outgroup. Mitochondrial (cytochrome b and 12S rRNA) sequence comparisons support the monophyly of Suina (Suidae and Tayassuidae) and Ancodonta (Hippopotamidae) but not the monophyly of Suiformes. Inversely, our preliminary morphological analysis supports the monophyly of Suiformes whereas relationships among the three families are not resolved. The combined data set does not resolve the relationships between Suina, Ancodonta, and Ruminantia. These results are discussed in relation to morphological characters and paleontological data. Some improvements are suggested to clarify the morphological definition of Suiformes and relationships among them.

[1]  N. Okada,et al.  Molecular evidence from retroposons that whales form a clade within even-toed ungulates , 1997, Nature.

[2]  C. Cunningham,et al.  Can three incongruence tests predict when data should be combined? , 1997, Molecular biology and evolution.

[3]  J. Gatesy.  More DNA support for a Cetacea/Hippopotamidae clade: the blood-clotting protein gene gamma-fibrinogen. , 1997, Molecular biology and evolution.

[4]  E. Douzery,et al.  Phylogenetic relationships of artiodactyls and cetaceans as deduced from the comparison of cytochrome b and 12S rRNA mitochondrial sequences. , 1997, Molecular biology and evolution.

[5]  P. Arctander,et al.  Evidence from milk casein genes that cetaceans are close relatives of hippopotamid artiodactyls. , 1996, Molecular biology and evolution.

[6]  M. Hasegawa,et al.  Phylogenetic position of cetaceans relative to artiodactyls: reanalysis of mitochondrial and nuclear sequences. , 1996, Molecular biology and evolution.

[7]  Ú. Árnason,et al.  Cytochrome b nucleotide sequences and the identification of five primary lineages of extant cetaceans. , 1996, Molecular biology and evolution.

[8]  C. Bult,et al.  TESTING SIGNIFICANCE OF INCONGRUENCE , 1994 .

[9]  J. Thewissen,et al.  Origin of underwater hearing in whales , 1993, Nature.

[10]  J. Huelsenbeck,et al.  Signal, noise, and reliability in molecular phylogenetic analyses. , 1992, The Journal of heredity.

[11]  K. Bremer.  THE LIMITS OF AMINO ACID SEQUENCE DATA IN ANGIOSPERM PHYLOGENETIC RECONSTRUCTION , 1988, Evolution; international journal of organic evolution.

[12]  M. Miyamoto,et al.  Biomolecular Systematics of Eutherian Mammals: Phylogenetic Patterns and Classification , 1986 .

[13]  J. Felsenstein.  CONFIDENCE LIMITS ON PHYLOGENIES: AN APPROACH USING THE BOOTSTRAP , 1985, Evolution; international journal of organic evolution.

[14]  M. Pickford.  Old World Suoid Systematics, Phylogeny, Biogeography and Biostratigraphy , 1993 .

[15]  E. Buffetaut,et al.  A colubrid snake in the late Eocene of Thailand : the oldest known Colubridae (Reptilia, Serpentes) , 1992 .

[16]  M. Pickford.  Update on hippo origins , 1989 .

[17]  A. Carsana,et al.  Molecular evolution of the ribonuclease superfamily. , 1988, Progress in biophysics and molecular biology.

[18]  George Gaylord Simpson,et al.  The Principles of Classification and a Classification of Mammals. , 1945 .

[19]  H. S. Pearson.  On the Skulls of Early Tertiary Suidae, together with an Account of the Otic Region in Some Other Primitive Artiodactyla , 1927 .