The premaxilla

comes from the Tupi-Guarani and means "the one who lives in the water"

although it shows specific adaptations in the shape of the skull and the frill

with its distinctive domed skull

Besanosaurus leptorhynchus Variant:Primed The premaxillaBesanosaurus leptorhynchus was an ichthyosaur that inhabited the seas of the Middle Triassic, approximately 240 million years ago, in what is now northern Italy. Fossils of this species were discovered in the Besano region, from which it takes its name, within the Besano Formation, a site known for its exceptional preservation of marine fossils. This species was formally described in 1996, and has since been the subject of studies due to its