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Like other pliosaurs, Kronosaurus was a marine reptile. It had an elongated head, a short neck, a stiff body propelled by four flippers, and a relatively short tail. The posterior flippers were larger than the anterior. Kronosaurus was carnivorous, and had many long, sharp, conical teeth. Current estimates put Kronosaurus at around 9–10 meters (30–33 feet) in length.[3]

All Sauropterygians had a modified pectoral girdle that supported a powerful swimming stroke[7]. Kronosaurus and other plesiosaurs/pliosaurs had a similarly adapted pelvic girdle[8], allowing them to push hard against the water with all four flippers. Between its two limb girdles was a massive mesh of gastralia (belly ribs) that provided additional strength and support[8]. The strength of the limb girdles, combined with evidence of large, powerful swimming muscles, indicates that Kronosaurus was likely a fast, active swimmer[

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