The neck vertebrae of Lagenanectes are square - shaped .
The neck vertebrae of Lagenanectes lack a notch on the lower side of the articular surfaces of the vertebral centra , which is characteristic for other elasmosaurs .
The neck vertebrae of Lagenanectes are square - shaped and lack a notch on the lower side of the articular surfaces of the vertebral centra , which is characteristic for other elasmosaurs .