Tobin L Hieronymus

Tobin L Hieronymus
Northeast Ohio Medical University | NEOMED · Department of Anatomy and Neurobiology

Ph.D.

About

28
Publications
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Introduction
Bony attachment morphology and microanatomy of skin, ligaments, and tendons in comparative perspective; Evolutionary morphology of soft tissues (wing feathers, beaks) as documented by adjacent bony tissues in fossil birds, dinosaurs, and their relatives; Vertebrate paleontology focused on the Paleogene evolution of living orders of birds (Neornithes).
Additional affiliations
September 2002 - March 2009
Ohio University
September 1998 - December 2002
Montana State University
Position
  • Museum of the Rockies

Publications

Publications (28)
Article
The horned dinosaur Pachyhinosaurus possesses rugose bony bosses across the skull roof in lieu of the projecting bony horn cores seen in most ceratopsians. This elaboration of typical ceratopsian ornaments provides an opportunity to test hypotheses of ceratopsian facial skin morphology and function. We analyze bone morphology and histology associat...
Article
Full-text available
Mechanisms for passively coordinating forelimb movements and flight feather abduction and adduction have been described separately from both in vivo and ex vivo studies. Skeletal coordination has been identified as a way for birds to simplify the neuromotor task of controlling flight stroke, but an understanding of the relationship between skeletal...
Article
Full-text available
Background The lake deposits of the informal Ruby Paper Shale unit, part of the Renova Formation of Montana, have yielded abundant plant fossils that document Late Eocene – Early Oligocene global cooling in western North America. A nearly complete small bird with feather impressions was recovered from this unit in in 1959, but has only been informa...
Article
Full-text available
Among living fliers (birds, bats, and insects), birds display relatively high aspect ratios, a dimensionless shape variable that distinguishes long and narrow vs. short and broad wings. Increasing aspect ratio results in a functional tradeoff between low induced drag (efficient cruise) and increased wing inertia (difficult takeoff). Given the wide...
Chapter
Full-text available
During the Eocene epoch, archaic cetaceans made the land-to-sea transition, giving rise to modern whales, dolphins, and porpoises. During this transition, the feeding apparatus of fossil remingtonocetines displayed morphologies that are distinct from other cetaceans, confounding straightforward interpretations of their feeding behaviors. This study...
Article
Locomotion on the narrow and compliant supports of the arboreal environment is inherently precarious. Previous studies have identified a host of morphological and behavioral specializations in arboreal animals broadly thought to promote stability when on precarious substrates. Less well-studied is the role of the tail in maintaining balance. Howeve...
Article
Objectives: Primate diagonal sequence (DS) gaits are often argued to be an adaptation for moving and foraging in the fine-branch niche; however, existing data have come predominantly from laboratory studies that are limited in taxonomic breadth and fail to account for the structural and ecological variation of natural substrates. We test the exten...
Article
Given that most species of primates are predominantly arboreal, maintaining the ability to move among branches of varying sizes has presumably been a common selective force in primate evolution. However, empirical evaluations of the relationships between morphological variation and characteristics of sub-strate geometry, such as substrate diameter...
Article
Full-text available
Crocodylians evolved some of the most characteristic skulls of the animal kingdom with specializations for semi‐aquatic and ambush lifestyles, resulting in a feeding apparatus capable of tolerating high biomechanical loads and bite forces and a head with a derived sense of trigeminal‐nerve‐mediated touch. The mandibular symphysis accommodates these...
Article
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Hominoid remains from Miocene deposits in India and Pakistan have played a pivotal role in understanding the evolution of great apes and humans since they were first described in the 19th Century. We describe here a hominoid maxillary fragment preserving the canine and cheek teeth collected in 2011 from the Kutch (= Kachchh) basin in the Kutch dist...
Data
Dental dimensions of the maxillary and mandibular cheek teeth of Sivapithecus and extant ape specimens. Sivapithecus measurements by RFK; those of extant Pongo spp., and Pan troglodytes from Plavcan [35]. (XLSX)
Article
Objectives: Laboratory studies have yielded important insights into primate locomotor mechanics. Nevertheless, laboratory studies fail to capture the range of ecological and structural variation encountered by free-ranging primates. We present techniques for collecting kinematic data on wild primates using consumer grade high-speed cameras and dem...
Article
Full-text available
In utero, baleen whales initiate the development of several dozens of teeth in upper and lower jaws. These tooth germs reach the bell stage and are sometimes mineralized, but toward the end of prenatal life they are resorbed and no trace remains after birth. Around the time that the germs disappear, the keratinous baleen plates start to form in the...
Article
The earliest cetaceans were interpreted as semi-aquatic based on the presence of thickened bones and stable oxygen isotopes in tooth enamel. However, the origin of aquatic behaviors in cetacean relatives (e.g., raoellids, anthracotheres) remains unclear. This study reconstructs the origins of aquatic behaviors based on long bone microanatomy and st...
Article
Full-text available
Nearly all living artiodactyls (even-toed ungulates) possess a derived cranial arterial pattern that is highly distinctive from most other mammals. Foremost among a suite of atypical arterial configurations is the functional and anatomical replacement of the internal carotid artery with an extensive, subdural arterial meshwork called the carotid re...
Article
The field of evolutionary developmental biology is broadly focused on identifying the genetic and developmental mechanisms underlying morphological diversity. Connecting the genotype with the phenotype means that evo-devo research often considers a wide range of evidence, from genetics and morphology to fossils. In this commentary, we provide an ov...
Article
Apes and Old World monkeys are prominent components of modern African and Asian ecosystems, yet the earliest phases of their evolutionary history have remained largely undocumented. The absence of crown catarrhine fossils older than ∼20 million years (Myr) has stood in stark contrast to molecular divergence estimates of ∼25-30 Myr for the split bet...
Article
Avian wing elements have been shown to experience both dorsoventral bending and torsional loads during flapping flight. However, not all birds use continuous flapping as a primary flight strategy. The pelecaniforms exhibit extraordinary diversity in flight mode, utilizing flapping, flap-gliding, and soaring. Here we (1) characterize the cross-secti...
Article
Full-text available
Fossil crocodyliforms discovered in recent years have revealed a level of morphological and ecological diversity not exhibited by extant members of the group. This diversity is particularly notable among taxa of the Cretaceous Period (144-65 million years ago) recovered from former Gondwanan landmasses. Here we report the discovery of a new species...
Article
Full-text available
La topologie d'éléments distincts du revêtement corné complexe des oiseaux est fortement similaire entre différents clades, non seulement dans leur apparence externe mais aussi dans la façon dont ces éléments correspondent aux structures sousjacentes. Nous avons réalisé une étude morphologique de 81 espèces d'oiseaux modernes et testé si les simila...
Chapter
This chapter discusses the physiology and behavioral responses of aquatic birds to chemical stimulants. It presents comparisons of aquatic versus terrestrial chemical sensations in aquatic birds. It focuses on avian olfaction, homing and foraging by olfactory cues, avian chemesthesis, and avian gustation. It also examines evolutionary changes in av...
Article
The nasal and frontal horns of two individuals of Ceratotherium simum were examined by x-ray computed tomography (CT scanning), gross observation of sectioned horn, and light microscopy of histological sections of the horn tissue. CT scans of both sets of horns reveal a periodic banding pattern that is evident upon gross observation of sections as...
Article
Muscular reconstructions in vertebrate paleontology have often relied heavily on the presence of "muscle scars" and similar osteological correlates of muscle attachment, a practice complicated by the fact that approximately half of tendinous muscle attachments to bone in extant vertebrates do not leave readily interpretable scars. Microanatomical a...

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