On the relationships of the Petalodontiformes (Chondrichthyes)

  title={On the relationships of the Petalodontiformes (Chondrichthyes)},
  author={Richard Lund and Eileen D. Grogan and Mojtaba Fath},
  journal={Paleontological Journal},
The Petalodontiformes are Upper Paleozoic marine euchondrocephalan chondrichthyans known primarily from isolated teeth. Few dentitions have been reported, among them that of the Permian Janassa bituminosa and “Janassa” korni and the Serpukhovian, Mississippian Belantsea montana, Obruchevodus griffithi, Netsepoye hawesi and Siksika ottae. A dentition has been reconstructed for the Pennsylvanian Petalodus ohioensis. New information on dentitions and postcranial morphology is now introduced for… 

First Record of Petalodus Owen, 1840 (Chondrichthyes, Petalodontidae) in the Lower Permian (Cisuralian) of China

The Petalodontiformes are a small intriguing group of Permo–Carboniferous chondrichthyans. Petalodus is the longest known petalodont genus generally considered representative of the order. The first

Case 3779 – Petalodus Owen, 1840 (Chondrichthyes, Petalodontiformes, Petalodontidae): proposed conservation of usage by designation of a neotype for its type species Petalodus hastingsii Owen, 1840

The Commission is asked to exercise its plenary power to set aside the misleading and inadequate holotype, NHM UK PV P613, and designate as neotype specimen NHMUK PV P75414, a more complete tooth that shows all the characteristic features of Petalodus.

Carboniferous chondrichthyan assemblages from the Surprise Canyon and Watahomigi formations (latest Mississippian–Early Pennsylvanian) of the western Grand Canyon, Northern Arizona

Abstract Two chondrichthyan assemblages of Late Mississippian/Early Pennsylvanian age are now recognized from the western Grand Canyon of northern Arizona. The latest Serpukhovian Surprise Canyon

Ecomorphology of the Mississippian fishes of the Bear Gulch Limestone (Heath formation, Montana, USA)

These analyses lend new insight into the adaptive radiations of Chondrichthyes and Osteichthyes subsequent to the Upper Devonian mass extinctions.

Holocephali From the Irati Formation (Paraná Basin), Brazil: Origin, Paleogographical and Paleoenvironmental Considerations

The Permian (Cisuralian) Irati Formation, from the Brazilian southeastern Paraná Basin bears, at some levels, Chondrichthyes, besides other vertebrates, which is an argument for a proposed isolation of two Brazilan Basins northeast Parnaíba and southeast Paraná, during the time of deposition of the Irati.

The Taquaral Member, Irati Formation (Paraná Basin, Permian): a synthesis of paleontological studies

The Irati Formation (Cisuralian, Kungurian) is noteworthy for many sedimentological, paleontological and taphonomic features, of great significance for unweaving paleoenvironmental details of

A critical appraisal of appendage disparity and homology in fishes

Identifying homologies of morphological traits across large phylogenetic scales is not always straightforward, as many structures are likely to have accrued changes in morphology and function over evolutionary time.

Family-group names of fossil fishes

The main goal of the list is to contribute to the usage of the correct family-group names for fossil fishes with a uniform spelling and to list the author(s) and date of those names.

Fin modules: an evolutionary perspective on appendage disparity in basal vertebrates

The results suggest that the pectoral/pelvic fins and the dorsal/anal fins form two distinct evolutionary modules, and that the latter is nested within a more inclusive median fins module.



A new petalodont chondrichthyan from the bear gulch limestone of montana, USA, with reassessment of Netsepoye hawesi and comments on the morphology of holomorphic petalodonts

A new holomorphic petalodont from the Bear Gulch Limestone, Obruchevodus griffithi, is described and features of the related Netsepoye hawesi are reinterpreted to provide insight into petaladont anatomical form and variation.

Two new iniopterygians (Chondrichthyes) from the Mississippian (Serpukhovian) Bear Gulch Limestone of Montana with evidence of a new form of chondrichthyan neurocranium

The neurocranium is unique among known chondrichthyans in presenting anterior ethmosphenoid and posterior otico-occipital units separated by an intracranial joint.

New petalodonts (Chondrichthyes) from the Upper Mississippian Bear Gulch Limestone (Namurian E2b) of Montana

The dental morphology and histology of the clade containing Tanaodus, Harpacodus, and Lisgodus support a hypothesis of sister group relationships with the Petalodontiformes as restricted.

A Basal Elasmobranch, Thrinacoselache gracia n. gen & sp., (Thrinacodontidae, New Family) from the Bear Gulch Limestone, Serpukhovian of Montana, USA

Thrinacoselache gracia is described from the Bear Gulch Limestone lens of Montana, with an elongate neurocranial region, occipital region that incorporates several separate vertebral zygal elements, extremely elongate, low body, and anatomically heterocercal, but horizontally oriented tail.

On the Dentition of the Petalodont Shark, Climaxodus

  • A. Woodward
  • History
    Quarterly Journal of the Geological Society of London
  • 1919
The dentition of the Petalodont sharks is still very imperfectly known. It has hitherto been satisfactorily observed only in the highly-specialized Janassa bituminosa from the Upper Permian

On a dentition of Polyrhizodus (Chondrichthyes, Petalodontiformes) from the Namurian bear gulch limestone of Montana

Abstract A partial dentition of Polyrhizodus is described from the Namurian A Bear Gulch Limestone Member, Heath Formation, Big Snowy Group of central Montana. The dentition is interpreted as

The rhadinichthyids (paleoniscoid actinopterygians) from the Bear Gulch Limestone of Montana (USA, Lower Carboniferous)

These fishes probably fed by suction, either at the bottom of the water column or by intake of floating nutritive particles, and were probably mechanical adaptations for a greater widening of the mouth cavity during abduction of the mandible.

Relationships of the Chimaeriformes and the basal radiation of the Chondrichthyes

  • R. LundE. Grogan
  • Environmental Science
    Reviews in Fish Biology and Fisheries
  • 2004
Morphological examination of fossil chondrichthyans indicates that the plesiomorphous state of the gnathostome suspensorium is autodiastylic and that complex labial cartilages are primitive and likely to have been critical to the mechanical architecture of the first jaws.

Two Tenaculum-Bearing Holocephalimorpha (Chondrichthyes) from the Bear Gulch Limestone (Chesterian, Serpukhovian) of Montana, USA

The isolated Visean (Scotland) and Chesterian (USA) spines named Harpacanthus fimbriatus can now be attributed to the anterior tenaculae of an autodiastylic holocephalimorph chondrichthyan on the

Biology of Sharks and Their Relatives

Phylogeny and Zoogeography The Origin and Relationships of Early Chondrichthyans Eileen D. Grogan, Richard Lund, and Emily Greenfest-Allen Elasmobranch Phylogeny: A Mitochondrial Estimate Based on