Zerina Johanson
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View article: Evolution of chondrichthyan jaw morphology, from ecological generalists to specialists
Evolution of chondrichthyan jaw morphology, from ecological generalists to specialists Open
Living chondrichthyans comprise only a fraction of their historical diversity represented in the fossil record, but together they provide insights into the evolution of this ancient clade. Using a theoretical morphology approach, we sought…
View article: Functional anatomy, jaw mechanisms, and feeding behavior of <i>Dunkleosteus terrelli</i> (Placodermi, Arthrodira)
Functional anatomy, jaw mechanisms, and feeding behavior of <i>Dunkleosteus terrelli</i> (Placodermi, Arthrodira) Open
The comparative and functional anatomy of the cleaver‐like jaws of the Late Devonian arthrodire Dunkleosteus terrelli remains poorly understood, despite significant advances in our understanding of arthrodire anatomy. Here, we re‐investiga…
View article: Adaptive radiation of pelagiarian fishes at the K/Pg boundary led to rapid diversification of mandible morphology
Adaptive radiation of pelagiarian fishes at the K/Pg boundary led to rapid diversification of mandible morphology Open
Mandibles represent a key evolutionary innovation that has enabled jawed vertebrates to adapt and diversify in response to a range of food sources, and changes in mandible shape are often linked with adaptive radiations into new ecological…
View article: Investigating the Morphogenesis and Replacement of Lamprey Toothlets Using Synchrotron Imaging
Investigating the Morphogenesis and Replacement of Lamprey Toothlets Using Synchrotron Imaging Open
Teeth are a key innovation that underpinned the adaptive radiation of jawed vertebrates; however, their evolutionary origin must lie with the diverse tooth‐like structures of living and fossil jawless vertebrates. Most previous studies hav…
View article: New specimens of the arthrodire Bullerichthys fascidens Dennis and Miles 1980 show incipient site-specific osteichthyan-like tooth addition and resorption
New specimens of the arthrodire Bullerichthys fascidens Dennis and Miles 1980 show incipient site-specific osteichthyan-like tooth addition and resorption Open
The arthrodiran placoderm Bullerichthys fascidens, from the Late Devonian Gogo Formation, Western Australia, was originally described from an incomplete headshield with only the spinal and interolateral plates known from the trunk shield. …
View article: Cellular, bone-like tissue in the bucklers and thorns of the thornback ray <i>Raja clavata</i> (Batoidea, Chondrichthyes)
Cellular, bone-like tissue in the bucklers and thorns of the thornback ray <i>Raja clavata</i> (Batoidea, Chondrichthyes) Open
Chondrichthyans (cartilaginous fishes) have lost the cellular bone characteristic of other jawed vertebrate skeletons. However, we identify cellular bone-like tissue in modified scales with enlarged bases, called ‘bucklers’ and ‘thorns’, w…
View article: Shark tooth regeneration: RNAseq reveals genes for unlimited dental renewal
Shark tooth regeneration: RNAseq reveals genes for unlimited dental renewal Open
Sharks are masters of tooth regeneration with a rapid and unlimited tooth supply. We present a comprehensive transcriptomic analysis across five distinct compartments from the embryonic shark mouth, capturing the full sequence of shark too…
View article: Three-dimensional fossils of a Cretaceous collared carpet shark (Parascylliidae, Orectolobiformes) shed light on skeletal evolution in galeomorphs
Three-dimensional fossils of a Cretaceous collared carpet shark (Parascylliidae, Orectolobiformes) shed light on skeletal evolution in galeomorphs Open
A rich fossil record of teeth shows that many living shark families’ origins lie deep in the Mesozoic. Skeletal fossils of the sharks to whom these teeth belonged are far rarer and when they are preserved are often flattened, hindering und…
View article: Three-dimensional fossils of a Cretaceous collared carpet shark (Parascylliidae, Orectolobiformes) shed light on skeletal evolution in galeomorphs
Three-dimensional fossils of a Cretaceous collared carpet shark (Parascylliidae, Orectolobiformes) shed light on skeletal evolution in galeomorphs Open
A rich fossil record of teeth shows that many living shark families’ origins lie deep in the Mesozoic. Skeletal fossils of the sharks to whom these teeth belonged are far rarer and when they are preserved are often flattened, hindering und…
View article: Divergent morphologies with convergent performance in the mandible of pelagiarian fishes
Divergent morphologies with convergent performance in the mandible of pelagiarian fishes Open
Mandibles represent a key evolutionary innovation that enabled jawed vertebrates to adapt and diversify in response to a range of food sources. Using a phylogenetic comparative approach, we explore the phenotypic disparity and mechanical p…
View article: Morphogenesis of pteraspid heterostracan oral plates and the evolutionary origin of teeth
Morphogenesis of pteraspid heterostracan oral plates and the evolutionary origin of teeth Open
Teeth are a key vertebrate innovation; their evolution is generally associated with the origin of jawed vertebrates. However, tooth-like structures already occur in jawless stem-gnathostomes; heterostracans bear denticles and morphological…
View article: Finite element and microstructural analyses indicate that pteraspid heterostracan oral plate microstructure was adapted to a mechanical function
Finite element and microstructural analyses indicate that pteraspid heterostracan oral plate microstructure was adapted to a mechanical function Open
Early vertebrate evolution has been characterized as a gradual shift from passive to more active feeding modes. However, this evolutionary scenario is contingent on poorly constrained inferences of the feeding ecology of extinct stem‐gnath…
View article: From head to tail: 3D imaging the whole-body morphology of the stem gnathostome <i>Anglaspis heintzi</i>
From head to tail: 3D imaging the whole-body morphology of the stem gnathostome <i>Anglaspis heintzi</i> Open
Stem-gnathostomes are pivotal in reconstructing the evolutionary history of vertebrates but three-dimensional data of their body anatomies are currently lacking. Heterostracans, which constitute one of the earliest-branching lineages of st…
View article: Early ray‐finned herbivores: the dental system of Eurynotoidiidae (Actinopterygii; middle–late Permian, European Russia) and implications for palaeobiology and palaeoecology
Early ray‐finned herbivores: the dental system of Eurynotoidiidae (Actinopterygii; middle–late Permian, European Russia) and implications for palaeobiology and palaeoecology Open
Eurynotoidiformes are a little‐known group of actinopterygian fishes from the Permian of European Russia, characterized by the possession of multicuspid marginal teeth arranged in a single row. Morphologically, the teeth resemble those of …
View article: The three-dimensionally articulated oral apparatus of a Devonian heterostracan sheds light on feeding in Palaeozoic jawless fishes
The three-dimensionally articulated oral apparatus of a Devonian heterostracan sheds light on feeding in Palaeozoic jawless fishes Open
Attempts to explain the origin and diversification of vertebrates have commonly invoked the evolution of feeding ecology, contrasting the passive suspension feeding of invertebrate chordates and larval lampreys with active predation in liv…
View article: The oldest three-dimensionally preserved vertebrate neurocranium
The oldest three-dimensionally preserved vertebrate neurocranium Open
The neurocranium is an integral part of the vertebrate head, itself a major evolutionary innovation 1,2 . However, its early history remains poorly understood, with great dissimilarity in form between the two living vertebrate groups: gnat…
View article: Presentation of the 2022 Schuchert Award of the Paleontological Society to Matt Friedman
Presentation of the 2022 Schuchert Award of the Paleontological Society to Matt Friedman Open
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View article: The three-dimensionally articulated oral apparatus of a Devonian heterostracan sheds light on feeding in Palaeozoic jawless fishes
The three-dimensionally articulated oral apparatus of a Devonian heterostracan sheds light on feeding in Palaeozoic jawless fishes Open
Attempts to explain the origin and diversification of vertebrates have commonly invoked the evolution of feeding ecology, contrasting the passive suspension feeding of invertebrate chordates and larval lampreys with active predation in liv…
View article: The dental system of †<i>Kazanichthys viatkensis</i> (Actinopterygii, Acrolepididae) from the middle Permian of European Russia: palaeobiological and palaeoecological inferences
The dental system of †<i>Kazanichthys viatkensis</i> (Actinopterygii, Acrolepididae) from the middle Permian of European Russia: palaeobiological and palaeoecological inferences Open
Among ray‐finned fishes (Actinopterygii), the crushing, durophagous feeding strategy first evolved in the early Carboniferous period, with the †Eurynotiformes possessing dentitions with single layers of partially to fully fused blunt teeth…
View article: A new dipnoan species Janvierpaucidentes tuulingi gen. et sp. nov. from the Pragian (Early Devonian) of Mimerdalen, Svalbard (Norway), with an unusual dentition
A new dipnoan species Janvierpaucidentes tuulingi gen. et sp. nov. from the Pragian (Early Devonian) of Mimerdalen, Svalbard (Norway), with an unusual dentition Open
A new dipnoan lower jaw from the Wood Bay Formation (Pragian) of Svalbard (Norway), preserves a partial dentary and partial toothplates referred to the new species Janvierpaucidentes tuulingi gen. et sp. nov. The more complete toothplate i…
View article: Structure, Growth and Histology of Gnathal Elements in Dunkleosteus (Arthrodira, Placodermi), with a Description of a New Species from the Famennian (Upper Devonian) of the Tver Region (North-Western Russia)
Structure, Growth and Histology of Gnathal Elements in Dunkleosteus (Arthrodira, Placodermi), with a Description of a New Species from the Famennian (Upper Devonian) of the Tver Region (North-Western Russia) Open
A new species of Dunkleosteus, D. tuderensis sp. nov., is named based on an infragnathal from the Famennian of the Tver Region, Russia. CT scanning of the holotype revealed two high-density bony constituents comparable in position and inte…
View article: How to tuna fish: constraint, convergence, and integration in the neurocranium of pelagiarian fishes
How to tuna fish: constraint, convergence, and integration in the neurocranium of pelagiarian fishes Open
Morphological evolution of the vertebrate skull has been explored across a wide range of tetrapod clades using geometric morphometrics, but the application of these methods to teleost fishes, accounting for roughly half of all vertebrate s…
View article: Testing hypotheses of pteraspid heterostracan feeding using computational fluid dynamics
Testing hypotheses of pteraspid heterostracan feeding using computational fluid dynamics Open
The early evolution of vertebrates in their ecological context is often depicted as a transition from passive to more active feeding behaviors. However, understanding the feeding ecology of extinct stem-gnathostomes, particularly heterostr…
View article: The oldest three-dimensionally preserved vertebrate neurocranium
The oldest three-dimensionally preserved vertebrate neurocranium Open
This contains: A) the morphological phylogenetic matrix described in the study as a nexus files. B) a zip file containing all of the 3D models used to make the figures as ply files.
View article: Testing hypotheses of pteraspid heterostracan feeding using computational fluid dynamics
Testing hypotheses of pteraspid heterostracan feeding using computational fluid dynamics Open
The ecological context of early vertebrate evolution has been characterized as a gradual shift from passive to more active feeding modes. This evolutionary scenario has been based largely on poorly constrained inferences of the feeding eco…
View article: The oldest three-dimensionally preserved vertebrate neurocranium
The oldest three-dimensionally preserved vertebrate neurocranium Open
This dataset contains the digitized treatments in Plazi based on the original journal article Dearden, Richard P., Lanzetti, Agnese, Giles, Sam, Johanson, Zerina, Jones, Andy S., Lautenschlager, Stephan, Randle, Emma, Sansom, Ivan J. (2023…
View article: Craniothoracic regions of Kolymaspis and Romundina
Craniothoracic regions of Kolymaspis and Romundina Open
Tomograms and surface models for Kolymaspis and Romundina used in the investigation of pharyngeal associations with the craniothoracic joint.
View article: How to tuna fish: constraint, convergence and integration in the neurocranium of pelagiarian fishes
How to tuna fish: constraint, convergence and integration in the neurocranium of pelagiarian fishes Open
Morphological evolution of the vertebrate skull has been explored across a wide range of tetrapod clades, but teleost fishes, accounting for roughly half of all vertebrate species, have largely been overlooked. Here we present the results …
View article: Bricks, trusses and superstructures: Strategies for skeletal reinforcement in batoid fishes (rays and skates)
Bricks, trusses and superstructures: Strategies for skeletal reinforcement in batoid fishes (rays and skates) Open
Crushing and eating hard prey (durophagy) is mechanically demanding. The cartilage jaws of durophagous stingrays are known to be reinforced relative to non-durophagous relatives, with a thickened external cortex of mineralized blocks (tess…