29MM Detailed Fossil Tetragramma Marticense Sea Urchin Echinoid Cretaceous

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 ranging from polar regions to equatorial waters and from shallow intertidal zones to abyssal depths exceeding 5,000 meters. The fossil record documents roughly 800 extant species within this group, reflecting their remarkable adaptability across virtually every major oceanic habitat. The echinoid designation derives from Latin terminology evoking the creature's distinctive form. During their lifetime, these animals possessed articulated spines that functioned as both defensive mechanisms and locomotor apparatus, enabling movement and protection within their aquatic ecosystems.