1.5" Halisaurus Walkeri Mosasaur Fossil Tooth Rooted Cretaceous Dinosaur Era COA

Location: Oued Zem, Morocco

Weight: 0.3 Ounces

Dimensions: 1.5 Inches Long, 0.8 Inches Wide, 0.4 Inches Thick

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85 - 66 Million Years old, Early Campanian, Maastrichtian Epoch.

Name: Halisaurus

Type: Carnivore / Piscivore

Size: 3 to 4 meters in length.

Beneath the surface of Late Cretaceous seas, Halisaurus moved with deliberate purpose. Weighing roughly 200 to 350 kilograms, this streamlined mosasaur was neither a giant nor a top predator, but it was perfectly suited to its role.

Its body was built for controlled movement rather than raw power. Instead of overwhelming prey with size, Halisaurus depended on precision. When hunting, its jaws opened wide, aided by flexible skull joints that allowed an impressive gape. Hidden along the roof of its mouth were pterygoid teeth—rear-facing spikes that ensured once prey was caught, escape was nearly impossible.

Fish and squid formed the core of its diet. Its narrow, needle-like teeth pierced rather than sliced, gripping slippery bodies before guiding them inward. There was no tearing of flesh, no chewing—only a swift capture followed by swallowing whole.

In the layered food web of Maastrichtian oceans, Halisaurus occupied a balanced position: predator, yet vulnerable to larger marine hunters. Its design reflects evolution’s subtle craftsmanship, proving that survival did not always depend on size alone. Though lesser known than its colossal relatives, Halisaurus remains a compelling example of specialisation in the final age of the dinosaurs.

Please be aware of the nature of fossils:

Being buried underground for millions of years under immense pressure can be quite harsh. Rarely does a fossil emerge fully intact and perfect. Most fossils have been restored to some extent, and some are even modified by humans to improve their appearance. In Morocco, workers perform their jobs professionally when uncovering and conserving these natural treasures. However, natural cracks are often visible on the surface, which are part of the fossil's natural beauty and are not seen as flaws.