Fig. 1 in An integrated approach to understanding the role of the long neck in plesiosaurs

Fig. 1. Body outlines of large (> 1 m total body length) extinct and extant vertebrates, primarily or secondarily adapted to the marine environment. A. Plesiosaurus sp., an extinct Jurassic plesiosauromorph plesiosaur. B. Thunnus thynnus, the extant Atlantic bluefin tuna, a teleost "fish". C. Carcharodon carcharias, the extant great white shark. D. Hydrurga leptonyx, the extant leopard seal. E. Physeter macrocephalus, the extant sperm whale. F. Tursiops truncatus, the extant common bottlenose dolphin. G. Platecarpus sp., an extinct Cretaceous mosasaur. H. Ichthyosaurus sp. an extinct Jurassic ichthyosaur. Note how the plesiosaur is the only large marine vertebrate with a long neck. Images not to scale.