29MM Detailed Fossil Tetragramma Marticense Sea Urchin Echinoid Cretaceous Finger Three-lobed body: Axial lobe (center)

Three-lobed body: Axial lobe (center) + two pleural lobes (sides)

This association is typically caused by hydrothermal activity

Why did this whale have such an enormous bite force

Recognized for its tongue-shaped leaves with a prominent midrib and reticulate venation

29MM Detailed Fossil Tetragramma Marticense Sea Urchin Echinoid Cretaceous Finger Three-lobed body: Axial lobe (center)Location: Morocco Weight: 0. 6 Ounces Dimensions: 29MM Late Cretaceous 95 89 Million Years Old The item pictured is the one you will receive. Tetragramma Marticense Sea Urchin represents a remarkable lineage of marine echinoderms with an extensive evolutionary history spanning approximately 450 million years since the Late Ordovician Period. These sophisticated organisms, colloquially termed "Sea Biscuits," inhabited diverse marine environments