2.8" Trilobite Mortality Plate Fossil Devonian Age 400 Million Years Old COA

Location: Morocco

Weight: 7 Ounces 

Dimensions: 2.8 Inches Long, 2.3 Inches Wide, 1.2 Inches Thick (Matrix) 

Comes with a Certificate of Authenticity.

The item pictured is the one you will receive.

Trilobites were some of the earliest complex animals to inhabit Earth’s oceans. As members of the class Trilobita, they represent one of the first major evolutionary successes of arthropods.

Their defining feature was a hard, calcified exoskeleton divided into three longitudinal lobes—hence the name “trilobite,” meaning “three-lobed.” This protective armor not only shielded them from predators but also ensured their remains fossilized in extraordinary detail.

Trilobites lived from the Early Cambrian through the end of the Permian period. During this vast span of time, they adapted to numerous ecological niches. Some species were bottom-dwellers that scavenged for food, others burrowed through sediment, and a few may have been active predators.

Anatomically, trilobites had a cephalon with compound eyes, a segmented thorax that allowed flexibility, and a pygidium forming a tail shield. Many species could curl into a tight ball as a defensive mechanism.

Today, trilobite fossils remain vital to paleontology, helping scientists reconstruct ancient marine ecosystems and chart the evolution of early life on Earth.

Why Are They Called Trilobites?

The name trilobite means “three-lobed”, referring to the body being divided lengthwise into:

• a central axial lobe

• two symmetrical pleural lobes

This three-lobed structure is a defining feature of trilobite fossils.

How Was a Trilobite’s Body Structured?

The trilobite body was divided into three main anatomical regions:

• Cephalon (head): Included compound eyes, mouthparts, and sensory organs such as antennae

• Thorax: A flexible middle section composed of 2 to 61 articulated segments

• Pygidium (tail): A fused rear section forming a protective shield

Why Are Trilobite Fossils So Common?

Thanks to their durable exoskeletons, trilobites fossilized easily. As a result, they are one of the most abundant, diverse, and well-studied fossil groups in the world, prized by scientists, educators, and fossil collectors alike.

Please be aware of the nature of fossils:

Being buried under tons of pressure for millions of years makes fossils rough. No fossil emerges perfect; most are restored or altered to improve presentation. Moroccan workers are professional in unearthing and preserving treasures, though surface cracks are visible—part of their natural beauty, not defects.