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

Location: Oued Zem, Morocco

Weight: 0.3 Ounces

Dimensions: 1.8 Inches Long, 0.9 Inches Wide, 0.5 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.

Halisaurus was a moderately sized mosasaur that inhabited the world’s oceans during the Maastrichtian stage of the Late Cretaceous. Estimated to weigh between 200 and 350 kilograms, it was smaller and lighter than many of its larger relatives. Its proportions suggest an animal designed for controlled, efficient swimming rather than raw speed.

The skull of Halisaurus reveals much about its predatory strategy. Flexible jaw joints enabled a wide gape, an important feature when seizing agile marine prey. In addition to its outward-facing teeth, Halisaurus possessed pterygoid teeth along the roof of its mouth. These inward-pointing teeth served as barbs, preventing captured prey from escaping once it was drawn in.

Its teeth were narrow and sharply pointed, built for piercing and holding rather than slicing flesh. This indicates that Halisaurus swallowed prey whole, likely targeting fish and soft-bodied cephalopods such as squid. This feeding style reduced the need for complex processing and allowed for quick consumption.

Though not among the dominant apex predators of its time, Halisaurus occupied a stable mid-level position in marine food webs. Its anatomy reflects specialization and efficiency, demonstrating that survival in Late Cretaceous seas relied as much on adaptation as on size.

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.