Named By: Roger B. J. Benson, Mark Evans and Patrick S. Druckenmiller - 2012.
Classification: Chordata, Reptilia, Sauropterygia, Plesiosauria, Rhomaleosauridae.
Species: A. arturi (type).
Size: Roughly About 2 meters long for the holotype.
Known locations: England, Somerset - Blue Lias Formation.
Time period: Hettangian of the Jurassic.
Fossil representation: (NHMUK 14550) Post cranial skeleton missing parts of the limbs and the end of the tail. Partial posterior (rear) of the skull also known. A second specimen is also known but uncatalogued at the time of writing.
Named after the legendary island of Avalon (and supposed resting place of King Arthur), Avalonnectes was a rhomaleosaurid plesiosaur. Aside from being related to the type genus of the group, Rhomaleosaurus, this meant that Avalonnectes is noted as being a genus of shorter necked plesiosaurs. Avalonnectes has been considered to be a more primitive member of these.
- High Diversity, Low Disparity and Small Body Size in Plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic Boundary - Roger B. J. Benson, Mark Evans and Patrick S. Druckenmiller - 2012.