Results 101 to 110 of about 42,398 (325)
The Anatomical Record, EarlyView.Abstract The canine of saber‐toothed predators represents one of the most specialized dental structures known. Hypotheses about the function of hypertrophied canines range from display and conspecific interaction, soft food processing, to active prey acquisition.
Z. Jack Tseng
wiley +1 more source
A Paradigm Lost: New Theories for Aspherical PNe [PDF]
arXiv, 1999 Theoretical Models for the shaping of PNe are reviewed in light of new high resolution images. The new data indicate the purely hydrodynamic interacting stellar winds model can not recover the full variety of shapes and kinematics. New models, some speculative, others more firmly grounded are discussed.
arxiv
Morphological diversity of saber‐tooth upper canines and its functional implications
The Anatomical Record, EarlyView.Abstract Elongated upper canine teeth, commonly known as saber‐teeth, have evolved three times within the sub‐order Feliformia. The species that wielded them flourished throughout the Cenozoic and have historically been separated into two morphological groups: the dirk‐tooths with longer, flatter canines, and the scimitar‐tooths with shorter, serrated ...
Caitlin D. Shelbourne +1 more
wiley +1 more source
Paleontology of Galaxies: Recovering the Star Formation & Chemical Enrichment Histories from Galaxy Spectra [PDF]
arXiv, 2007 Recent advances in stellar population modelling and avalanches of data from mega-surveys have revived the interest in techniques to extract information about galaxy evolution from integrated spectra. This contribution provides an informal and (hopefully) pedagogical, but inevitably biased and incomplete introduction to this field.
arxiv
The Anatomical Record, EarlyView.Abstract The evolution of organisms can be studied through the lens of developmental systems, as the timing of development of morphological features is an important aspect to consider when studying a phenotype. Such data can be challenging to obtain in fossil amniotes owing to the scarcity of their fossil record. However, the numerous remains of Rancho
Narimane Chatar +5 more
wiley +1 more source
Predicting ecology and hearing sensitivities in Parapontoporia—An extinct long‐snouted dolphin
The Anatomical Record, EarlyView.Abstract Analyses of the cetacean (whale and dolphin) inner ear provide glimpses into the ecology and evolution of extinct and extant groups. The paleoecology of the long‐snouted odontocete (toothed whale) group, Parapontoporia, is primarily marine with its depositional context also suggesting freshwater tolerance.
Joyce Sanks, Rachel Racicot
wiley +1 more source
Neural canal ridges: A novel osteological correlate of postcranial neuroanatomy in dinosaurs
The Anatomical Record, EarlyView.Abstract In this article, we document the widespread presence of bony ridges in the neural canals of non‐avian dinosaurs, including a wide diversity of sauropods, two theropods, a thyreophoran, and a hadrosaur. These structures are present only in the caudal vertebrae.
Jessie Atterholt +7 more
wiley +1 more source
The Anatomical Record, EarlyView.Abstract The three mammalian auditory ossicles enhance sound transmission from the tympanic membrane to the inner ear. The anterior anchoring of the malleus is one of the key characters for functional classification of the auditory ossicles. Previous studies revealed a medial outgrowth of the mallear anterior process, the processus internus ...
Franziska Fritzsche +2 more
wiley +1 more source
Quantitative assessment of masticatory muscles based on skull muscle attachment areas in Carnivora
The Anatomical Record, EarlyView.Abstract Masticatory muscles are composed of the temporalis, masseter, and pterygoid muscles in mammals. Each muscle has a different origin on the skull and insertion on the mandible; thus, all masticatory muscles contract in different directions. Collecting in vivo data and directly measuring the masticatory muscles anatomically in various Carnivora ...
Kai Ito +4 more
wiley +1 more source
Morphological clocks in paleontology, and a mid-Cretaceous origin of crown Aves.
Systematic Biology, 2014 Birds are among the most diverse and intensivelystudied vertebrate groups, but many aspects of theirhigher-level phylogeny and evolution still remaincontroversial.
Michael S. Y. Lee +3 more
semanticscholar +1 more source