Teeth in sharks are shed and replaced throughout their lifetime. Morphological dental
changes through ontogeny have been identified in several species and have been …

ABSTRACT A new extinct sclerorhynchoid sawfish, Ptychotrygon ameghinorum sp. nov., is
presented here based on abundant isolated teeth and some dermal denticles, which were …

Elasmobranchs, comprising sharks, skates, and rays, have a long evolutionary history
extending back into the Palaeozoic. They are characterized by various unique traits …

Here we report on four highly peculiar skate teeth from Arcille and Certaldo, two Pliocene
localities of Tuscany (central Italy). While being attributable to Rajiformes and somewhat …

An important character on several taxonomic levels for shark identification is the tooth
morphology. Sharks show a variety of highly specialized dentitions reflecting adaptations to …

Among the ichthyofaunal remains collected in the Tertiary deposits of Peruvian Amazonia,
elasmobranchs show an unexpected richness of rays, consisting primarily of mostly …

This paper presents information on the morphological, morphometric, and dental sex
differences in the dwarf round ray Urotrygon nana. We recorded 12 morphological traits, sex …

Secondary sexual dimorphism is an interesting and stupendous subject of research study
due to the fact that it is a result of sexual selection, mostly attributed to either female mate …

This study found that the reef stingray Urobatis concentricus presents a matrotrophic
aplacental viviparous reproduction with yolk sac and trophonemata formation. Growth of …

The feeding habits of Urotrygon microphthalmum, a Critically Endangered (CR) species,
were investigated through stomach contents analysis from specimens caught on bottom …