Portal de Periódicos da CAPES

The shark fauna from the Middle Triassic (Anisian) of North-Western Nevada

2001; Oxford University Press; Volume: 133; Issue: 3 Linguagem: Inglês

10.1111/j.1096-3642.2001.tb00627.x

1096-3642

Gilles Cuny, Olivier Rieppel, P. Martin Sander,

Fish biology, ecology, and behavior

The shark fauna from the Anisian of Nevada is dominated by durophagous hybodontiforms but also shows an important neoselachian component. Two new species of hybodontiform sharks, Acrodus cuneocostatus and Polyacrodus bucheri, are described in addition to a new neoselachian taxon: Mucrovenator minimus. The enameloid of the teeth of Acrodus and Polyacrodus comprises two layers, an outer compact layer and an inner bundled layer. For the typical three-layered enameloid of neoselachian teeth, we propose to replace the terms parallel-fibred enameloid and tangled-fibred enameloid by the more appropriate parallel-bundled and tangled-bundled enameloid.