Metacanthina issoumourensis Trilobite | Morocco

Metacanthina issoumourensis
Early Devonian (Pragian Stage)
Lhandar Formation
Lghaft, Morocco

Matrix approx. size: 3.75" x 2.25" x 2"

Specimen approx. size: 1.25" x 1"

Metacanthina issoumourensis is a striking Devonian trilobite best known for its dramatic spines and beautifully sculpted exoskeleton. Fossils of this species are primarily from southeastern Morocco (Issoumour region, which gives the species its name).

What Makes It Special?

This trilobite isn’t subtle. It’s armored and ostentatious at the same time.

Long Genal Spines

The sweeping spines extending from the cheeks (genal spines) are one of its signature features. These likely helped deter predators and may have made the animal appear larger.

Thoracic & Pygidial Spines

The body segments and tail (pygidium) also carry smaller but sharp spines, giving it a bristling, defensive look.

Highly Convex Glabella

The central lobe of the head (glabella) is inflated and well-defined, giving the animal a strong, sculpted profile.

Enrollment

Like many trilobites, Metacanthina issoumourensis could roll into a tight ball. When enrolled, the spines formed a protective cage.

Lifestyle & Ecology

During the Devonian, this trilobite lived in shallow marine environments. It likely:

• Crawled along the sea floor.

• Scavenged organic material.

• Relied on armor and spines to avoid predation from early fish and cephalopods.