Virtual reconstruction of the skeletal labyrinth of two lamnid sharks (Elasmobranchii, Lamniformes).

The first virtual reconstruction of the skeletal labyrinth of the porbeagle shark Lamna nasus and the shortfin mako shark Isurus oxyrinchus is presented here using high-resolution micro-computed tomography. The results, in comparison with previously published information, suggest relationships between skeletal labyrinth morphology and locomotion mode in chondrichthyans, but also show that further studies are required to establish such connections. Nevertheless, this study adds to the knowledge of the skeletal labyrinth morphology in two apex elasmobranch species.

[1]  Jason S. Anderson,et al.  The Braincase and Endosseous Labyrinth of Plioplatecarpus peckensis (Mosasauridae, Plioplatecarpinae), With Functional Implications for Locomotor Behavior , 2015, Anatomical record.

[2]  T. Martin,et al.  Bony labyrinth morphometry indicates locomotor adaptations in the squirrel-related clade (Rodentia, Mammalia) , 2015, Proceedings of the Royal Society B: Biological Sciences.

[3]  J. Maisey,et al.  Chondrocranial Morphology of the Salmon Shark, Lamna ditropis, and the Porbeagle, L. nasus (Lamnidae) , 2013, Copeia.

[4]  P. Tafforeau,et al.  Holocephalan Embryo Provides New Information on the Evolution of the Glossopharyngeal Nerve, Metotic Fissure and Parachordal Plate in Gnathostomes , 2013, PloS one.

[5]  J. J. Flynn,et al.  Imaging the inner ear in fossil mammals: High-resolution CT scanning and 3-D virtual reconstructions , 2012 .

[6]  J. Ragle,et al.  IUCN Red List of Threatened Species , 2010 .

[7]  H. L. Pratt,et al.  The Rise and Fall (Again) of the Porbeagle Shark Population in the Northwest Atlantic , 2009 .

[8]  Timothy M. Ryan,et al.  The primate semicircular canal system and locomotion , 2007, Proceedings of the National Academy of Sciences.

[9]  J. Maisey.  Morphology of the Braincase in the Broadnose Sevengill Shark Notorynchus (Elasmobranchii, Hexanchiformes), Based on CT Scanning , 2004 .

[10]  F. Spoor,et al.  Vestibular evidence for the evolution of aquatic behaviour in early cetaceans , 2002, Nature.

[11]  J. Maisey.  Remarks on the inner ear of elasmobranchs and its interpretation from skeletal labyrinth morphology , 2001, Journal of morphology.

[12]  H. Hadžiselimović,et al.  APPEARANCE OF SEMICIRCULAR CANALS IN BIRDS IN RELATION TO MODE OF LIFE. , 1964, Acta anatomica.

[13]  C. Stewart.  On the Membranous Labyrinths of certain Sharks. , 1906 .

[14]  L. S. Demski,et al.  Sensory Biology of Elasmobranchs , 2009 .

[15]  W. John,et al.  A REVIEW OF THE SOUTHERN CALIFORNIA EXPERIMENTAL DRIFT LONGLINE FISHERY FOR SHARKS, 1988-1 991 , 1994 .