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Figure 4. Chronostratigraphic distribution of fossil Inioidea genera. The cladogram at the bottom of the
figure represent the proposed phylogenetic relationships of the superfamily.
The phylogenetic position of Lipotidae, including Lipotes , the poorly known Prolipotes
and the pontoporiid-like Parapontoporia , cannot be unambiguously determined. Evidence
suggests it is the sister group of the clade composed by Brachydelphidae + (Iniidae +
Pontoporiiidae), and so it may be included in the superfamily Inioidea, or even as the sister
group of the clade ((Brachydelphidae (Iniidae+Pontoporiiidae)) Delphinoidea), which may
grant it a superfamiliar rank.
A CKNOWLEDGMENTS
I am thankful to Dr. Manuel Ruiz-García for the invitation to write this chapter. The
photographs of the holotype of Goniodelphis hudsoni was kindly provided by the Museum of
Comparative Zoology, Harvard University.
R EFERENCES
[1]
Allen, G. (1941). A Fossil River Dolphin From Florida. Bulletin of the Museum of
Comparative Zoology, 89: 3-11.
[2]
Ameghino, F. (1891). Mamíferos y aves fósiles Argentinas: Especies nuevas, adiciones,
y correciones. Revista Argentina de Historia Natural, 1(3), 240-259
[3]
Banguera-Hinestroza, E., Cardenas, H. Ruiz-García, M. Marmontel, M., Gaitán, E.,
Vázquez, R., & García Vallejo, F. (2002) Molecular identification of evolutionarily
significant units in the Amazon River Dolphin Inia sp. (Cetacea: Iniidae). The Journal
of Heredity , 93, 316-322.
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