The Visceral Skeleton and Jaw Suspension In the Durophagous Hybodontid Shark Tribodus limae from the Lower Cretaceous of Brazil

  title={The Visceral Skeleton and Jaw Suspension In the Durophagous Hybodontid Shark Tribodus limae from the Lower Cretaceous of Brazil},
  author={Jennifer A. Lane and John G. Maisey},
  booktitle={Journal of Paleontology},
Abstract The visceral skeleton (including complete mandibular, hyoid, and branchial arches) and teeth of the Lower Cretaceous hybodontid shark Tribodus limae are described based on well preserved fossil material. Jaw suspension and musculature are reconstructed, representing the first reconstruction of jaw musculature in a hybodont. The jaw suspension of Tribodus is similar to batoids and advanced galeomorphs in lacking direct cranio–palatine articulations and having skeletal jaw support by the… 
A symmoriiform from the Late Devonian of Morocco demonstrates a derived jaw function in ancient chondrichthyans
A previously undescribed symmoriiform shark, Ferromirum oukherbouchi, from the Late Devonian of the Anti-Atlas is reported, in which the jaw articulation is specialized and drives mandibular rotation outward when the mouth opens, and inward upon closure.
A Palaeozoic shark with osteichthyan-like branchial arches
A 325 million year (Myr)-old Palaeozoic shark-like fossil is described that represents the earliest identified chondrichthyan in which the complete gill skeleton is three-dimensionally preserved in its natural position, and its visceral arch arrangement is remarkably osteichthyan-like, suggesting that this may represent the common ancestral condition for crown gnathostomes.
First Shark from the Late Devonian (Frasnian) Gogo Formation, Western Australia Sheds New Light on the Development of Tessellated Calcified Cartilage
The specimen is the first Devonian shark body fossil to be acid-prepared, revealing the endoskeletal elements as three-dimensional undistorted units: Meckel’s cartilages, nasal, ceratohyal, basibranchial and possible epibranchials cartilage, plus left and right scapulocoracoids, as well as teeth and scales.
Durnonovariaodus maiseyi gen. et sp. nov., a new hybodontiform shark-like chondrichthyan from the Upper Jurassic Kimmeridge Clay Formation of England
A partial skeleton of a hybodontiform shark-like chondrichthyan from the Upper Jurassic Kimmeridge Clay Formation of Dorset, England, is described and designated as a new genus and species,
A unique hybodontiform skeleton provides novel insights into Mesozoic chondrichthyan life
Asteracanthus was one of the most common Mesozoic hybodontiform chondrichthyans, given that remains traditionally referred to this genus have been reported almost worldwide from Middle Triassic to
Dental patterning in the earliest sharks: Implications for tooth evolution
Doliodus provides several clues about the early evolution of the “shark‐like” dentition in chondrichthyans and also raises new questions about the evolution of oral teeth in jawed vertebrates.
Shark (Chondrichthyes) microremains from the Lower Cretaceous Quiricó Formation, Sanfranciscana Basin, Southeast Brazil
ABSTRACT The first chondrichthyan teeth, dermal and oropharyngeal denticles from the Lower Cretaceous lacustrine Quiricó Formation (Sanfranciscana Basin), in southeastern Brazil are described. Eight
Architectural and ultrastructural features of tessellated calcified cartilage in modern and extinct chondrichthyan fishes.
It is hypothesized that heavily biomineralized 'layer-cake' TCC in certain Paleozoic chondrichthyans perhaps served a dual physiological role, as a phosphate sink and in providing increased skeletal density in very large Devonian-Permian marine sharks such as ctenacanths, and as an adaptation to calcium-deficient environments among Permo-Carboniferous non-marine Sharks such as xenacanths.
The Phylogeny of Rays and Skates (Chondrichthyes: Elasmobranchii) Based on Morphological Characters Revisited
Elasmobranchii are relatively well-studied. However, numerous phylogenetic uncertainties about their relationships remain. Here, we revisit the phylogenetic evidence based on a detailed morphological
X-ray computed tomography library of shark anatomy and lower jaw surface models
A x-ray computed tomography library of shark cranial anatomy with three-dimensional (3D) lower jaw reconstructions is created to investigate and better understand the ecomorphology of extant shark feeding systems.


The anatomy and interrelationships of Mesozoic hybodont sharks. American Museum novitates ; no. 2724
It is concluded that Mesozoic hybodonts represent terminal members of a selachian group which has a lengthy Paleozoic history and is a far more precise statement than has hitherto been made regarding the early history of hyBodont sharks.
Pectoral Anatomy of Tribodus limae (Elasmobranchii: Hybodontiformes) from the Lower Cretaceous of Northeastern Brazil
ABSTRACT New, undescribed material of the hybodont shark Tribodus limae, from the Lower Cretaceous of northeastern Brazil, provides new information on the pectoral endoskeleton in this taxon. This
Morphology and evolution of the jaw suspension in lamniform sharks
  • C. Wilga
  • Environmental Science
    Journal of morphology
  • 2005
The morphology of the jaw suspension and jaw protrusion mechanism in lamniform sharks is described and mapped onto a cladogram to investigate how changes in jaw suspension and protrusion have
Cranial anatomy of the Lower Jurassic shark Hybodus reticulatus (Chondrichthyes, Elasmobranchii) : with comments on hybodontid systematics / John G. Maisey. American Museum novitates ; no. 2878
The cranial anatomy is described from several incomplete specimens, including some of the type material, and Comparisons are made with the Lower Cretaceous Hybodus basanus, whose cranial morphology is more completely known.
Anatomy and functional morphology of the feeding apparatus of the lesser electric ray, Narcine brasiliensis (Elasmobranchii: Batoidea)
The pronounced jaw kinesis of N. brasiliensis is partly a function of common batoid characteristics: euhyostylic jaw suspension and complex and subdivided cranial musculature, affording fine motor control.
Morphology of the Braincase in the Cretaceous Hybodont Shark Tribodus limae (Chondrichthyes: Elasmobranchii), Based on CT Scanning
The braincase of Tribodus shares many features with those of Egertonodus and neoselachians, providing further support for the sister-group relationship between hybodonts and extant elasmobranchs.
A functional analysis of jaw suspension in elasmobranchs
J jaw suspension types mapped onto a gnathostome phylogeny support the evolution of holostyly and hyostYly from an autodiastylic ancestral condition and the best morphological predictor of jaw mobility appears to be either a long ethmopalatine ligament or no ligament.
Visceral skeleton and musculature of a Late Devonian shark
ABSTRACT Much of the visceral skeleton (jaws, hyoid arch, and branchial arches) and superficial orobranchial musculature is described from an unique three-dimensionally preserved cladoselachian from
A new skeleton of Ianthasaurus hardestii, a primitive edaphosaur (Synapsida: Pelycosauria) from the Upper Pennsylvanian of Kansas
A new specimen from the Upper Pennsylvanian of Garnett, Kansas, is referable to the edaphosaur Ianthasaurus hardestii. It is the second articulated skeleton known of this species, and possesses
The articular relations with the chondrocranium of the upper and lower jaw-cartilages and the hyomandibular, as typified in Ceratodis, in Squalus, and in Notidanus, are in themselves of course