Show simple item record

dc.contributor.advisorSantos-Mercado, Hernán
dc.contributor.authorVelez-Rosado, Kevin I.
dc.date.accessioned2019-08-12T15:10:40Z
dc.date.available2019-08-12T15:10:40Z
dc.date.issued2019-05-15
dc.identifier.urihttps://hdl.handle.net/20.500.11801/2498
dc.description.abstractA new pinniped from the family Desmatophocidae is described from the Middle Altamira Shale (14.9-13.1 Ma) of the Monterey Formation of California. The specimen was added to a osteological character state matrix of 25 ingroup taxa and 1000 replicates using the tree-bisection-reconnection algorithm. In our most parsimonious tree, the specimen was recovered as a new species of the genus Allodesmus, being sister taxon of the clade comprising Al. kernensis, Al. demerei and Al. uraiporensis. Allodesmus sp. nov. was collected from the same formation as a second species of the family, Atopotarus courseni, which indicates that both species where living at the same time and place during the Miocene of California. A Principal Component Analysis (PCA) was carried individually for Allodesmus kernensis skulls (including the specimen described), mandibles, astragali and calcanei. Except for the skulls, all data sets (mandibles, astragali and calcanei) show similar patterns where adult males are clustered separately from adult females and juveniles. In general, the PCA is interpreted as sexually dimorphic species with adult males of the genus Allodesmus kernensis larger in size than adult females.en_US
dc.description.sponsorshipPuerto Rico Louis Stokes Alliance for Minority Participation (PR-LSAMP) Transformational Initiative for Graduate Education and Research Extramural Research Experience Award (TIGER-EREA)en_US
dc.language.isoenen_US
dc.rightsCC0 1.0 Universal*
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subjectPinnipediaen_US
dc.subjectDesmatophocidaeen_US
dc.subjectAllodesmusen_US
dc.subjectSystematicsen_US
dc.subjectSexual Dimorphismen_US
dc.subject.lcshPinnipedia, Fossil -- Californiaen_US
dc.subject.lcshGeology, Stratigraphic, Mioceneen_US
dc.subject.lcshSilt -- Californiaen_US
dc.subject.lcshMonterey Formation (Calif.)en_US
dc.subject.lcshPrincipal Component Analysisen_US
dc.titleTaxonomy, phylogeny and sexual dimorphism of allodesmus spp. (Pinnipedia: Desmatophocidae) from the middle miocene Altamira Shale and Round Mountain Silt Formationen_US
dc.typeDissertationen_US
dc.rights.holder(c) 2019 Kevin I. Velez Rosadoen_US
dc.contributor.committeeRamirez Martinez, Wilson
dc.contributor.committeeVelez Juarbe, Jorge
dc.contributor.representativeRoman Perez, Rosa I.
thesis.degree.levelM.S.en_US
thesis.degree.disciplineGeologyen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Geologyen_US
dc.description.graduationSemesterSpringen_US
dc.description.graduationYear2019en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

  • Theses & Dissertations
    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a degree at UPR-Mayagüez.

Show simple item record

CC0 1.0 Universal
Except where otherwise noted, this item's license is described as CC0 1.0 Universal