Patterns of Skull Variation ofBrachydelphis(Cetacea, Odontoceti) from the Neogene of the Southeastern Pacific

Autor:	Carolina Simon Gutstein, Mario A. Cozzuol, Alexander O. Vargas, Mario E. Suárez, Cesar L. Schultz, David Rubilar-Rogers
Rok vydání:	2009
Předmět:	Ecology Holotype Zoology Postcrania Late Miocene Biology Neogene Taxon Genus Pisco Formation Genetics Juvenile Animal Science and Zoology Ecology Evolution Behavior and Systematics Nature and Landscape Conservation
Zdroj:	Journal of Mammalogy. 90:504-519
ISSN:	1545-1542 0022-2372
Popis:	Brachydelphis mazeasi Muizon, 1988a, from the Pisco Formation (middle Miocene, Peru), is an odontocete originally known from 2 incomplete skulls and a few associated postcranial elements, assigned to the family Pontoporiidae, and to the subfamily Brachydelphininae (¼ Brachydelphinae) created to include this genus. The holotype is considered here as a juvenile because it has no alveolar septa and presents wide-open cranial sutures. Consequently, some of the diagnostic features actually correspond to juvenile features and are not taxonomically significant. Here we offer a more comprehensive view of the morphology and variation of this taxon with new specimens from both Pisco and Baho´a Inglesa formations (late Miocene, Chile). A revision of the original description of the genus, compared to other taxa of the Inioidea clade is provided. Additionally, a comparison by morphometric analysis (geometric and traditional) to Pontoporia blainvillei (living Pontoporiidae) is given. The shape variation of fetal, young, and adult specimens of P. blainvillei was compared to specimens of juvenile and adult B. mazeasi to evaluate ontogenetic, individual, and interspecific variation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fa32f00ea02415320d060e01c9fb20f9 https://doi.org/10.1644/07-mamm-a-081.1 Zobrazit plný text záznamu