Journal of Mammalian Evolution
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An enigmatic giraffid from the latest Miocene of Italy: Taxonomy, affinity, and paleobiogeographic implications
Journal of Mammalian Evolution - Tập 30 - Trang 403-413 - 2023
The origin and evolution of endemic species characterizing the Oreopithecus-faunal assemblages of the Tusco-Sardinian archipelago remain a matter of debate. An emblematic case is the enigmatic giraffid Umbrotherium azzarolii, represented by a single specimen from the type locality of Casteani (Tuscany) and by several isolated teeth and fragmentary mandibles from the locality of Fiume Santo (Sardin......
The Ear Region of the Pen-tailed Treeshrew, Ptilocercus lowii Gray, 1848 (Placentalia, Scandentia, Ptilocercidae)
Journal of Mammalian Evolution - Tập 16 - Trang 199-233 - 2009
The ear region of the pen-tailed treeshrew, Ptilocercus lowii Gray, 1848 (Scandentia, Ptilocercidae), is described and illustrated in detail based on five museum specimens from the National Museum of Natural History, two with the auditory bulla removed exposing the intratympanic surfaces. Soft tissues (arteries, veins, nerves, and muscles) are reconstructed onto the adult skulls based on published......
Forelimb Bone Morphology and its Association with Foraging Ecology in Four Families of Neotropical Bats
Journal of Mammalian Evolution - Tập 28 - Trang 99-110 - 2020
The form-function paradigm postulates the existence of a correlation between form and function; a remarkable example of this is the transformation of the forelimb of bats into wings. The wings of bats are complex structures made of membranes, muscles, tendons, cartilages, bones, and joints. Forelimb bones are critical elements of wings because they form an essential part of the alar mass, serve to......
Complete Mitochondrial Genomes and Eutherian Evolution
Journal of Mammalian Evolution - Tập 9 - Trang 281-305 - 2002
Recent large-scale nuclear DNA phylogenies have supported unconventional interordinal relationships among modern eutherians as well as divergence dates (100 mya) that substantially predate the first appearance of fossils from modern eutherians near the Cretaceous/Cenozoic (K/T) boundary (65-70 mya). For comparison to the nuclear data, I analyzed 12 complete mitochondrial DNA (mtDNA) protein-coding......
The Early Eocene Climatic Optimum at the Lower Section of the Lumbrera Formation (Ypresian, Salta Province, Northwestern Argentina): Origin and Early Diversification of the Cingulata
Journal of Mammalian Evolution - Tập 28 - Trang 621-633 - 2021
Recently, the basal beds of the lower section of the Lumbrera Formation have been referred to the early Eocene (Ypresian) based on the identification of a succession of hyperthermal events globally dated between 52 and 55 Ma. Nevertheless, this section have also been referred to the middle Eocene (Lutetian) based on the ‘evolutionary stage’ of its fossil mammals. In this contribution, we present a......
New Skull Material of Taeniolabis taoensis (Multituberculata, Taeniolabididae) from the Early Paleocene (Danian) of the Denver Basin, Colorado
Journal of Mammalian Evolution - Tập 28 - Trang 1083-1143 - 2021
Taeniolabis taoensis is an iconic multituberculate mammal of early Paleocene (Puercan 3) age from the Western Interior of North America. Here we report the discovery of significant new skull material (one nearly complete cranium, two partial crania, one nearly complete dentary) of T. taoensis in phosphatic concretions from the Corral Bluffs study area, Denver Formation (Danian portion), Denver Bas......
A Comparative Study of Pygmy Hippopotamus (Choeropsis liberiensis) Karyotype by Cross-Species Chromosome Painting
Journal of Mammalian Evolution - Tập 24 - Trang 465-474 - 2016
The family Hippopotamidae is comprised of two genera with two living species, the common hippo (Hippopotamus amphibius) and the pygmy hippo (Choeropsis liberiensis). Unlike the common hippo, the karyotype of C. liberiensis has not yet been investigated via cross-species chromosome painting methods. We established chromosomal homologies between the pygmy hippo, pig, and cattle by fluorescence in si......
On the Eating Habits of Sloths: Finite Element Analysis and Niche Specialization
Journal of Mammalian Evolution - - 2022
We applied finite element analysis (FEA) in mandibles of nine sloths, including the two extant genera (Bradypus and Choloepus) and seven extinct genera (Eremotherium, Hapalops, Megatherium, Neocnus, Nothrotheriops, Nothrotherium, and Paramylodon). We built 2-D planar models of the mandibles of each taxon and evaluated their resulting stress patterns during the action of jaw-closing muscles (masset......
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