In a journey back 470 million years ago, the ancient seas teemed with life, and at the pinnacle of this marine ecosystem were colossal arthropods, nearly 7 feet (2 meters) in length, according to the revelation of exquisitely preserved fossils in Morocco.

These giant arthropods, distant relatives of today’s shrimps, insects, and spiders, left an indelible mark on the ancient seas, dominating the waters in a way that seems gargantuan when compared to their modern descendants.

The fossil site at Taichoute in Morocco, once an undersea realm and now a desert, holds a treasure trove of insights into this prehistoric era. The site, part of the broader “Fezouata Biota,” reveals evidence of numerous large, free-swimming arthropods.

Although further research is needed to analyze these fragments fully, the colossal arthropods are estimated to reach lengths of up to 2 meters.

The international research team underscores the uniqueness of the Taichoute site, distinguishing it from other well-known Fezouata Shale sites located 80 km away. This discovery opens new avenues for paleontological and ecological research, providing a fresh perspective on sedimentology, paleontology, and fossil preservation.

Lead author Dr. Farid Saleh, from the University of Lausanne and Yunnan University, emphasizes the novelty of the Taichoute locality, highlighting its significance in enhancing our understanding of past life on Earth. The sedimentology, paleontology, and fossil preservation at this site collectively contribute to the richness of the Fezouata Biota.

Dr. Xiaoya Ma, from the University of Exeter and Yunnan University, underscores the potential identification of new species among the giant arthropods. Despite the incomplete identification, their remarkable size and free-swimming lifestyle suggest a unique role in ancient ecosystems, challenging previous perceptions of the early marine environment.

The Fezouata Shale, encompassing Taichoute, recently gained global recognition as one of the 100 most important geological sites. Dated to the Early Ordovician period, approximately 470 million years ago, this site provides a critical window into the evolution of life during that era.

The fossils discovered in these rocks, including mineralized elements and exceptionally preserved soft parts, offer scientists an unprecedented opportunity to study the anatomy of early animal life on Earth.

While the Fezouata Shale’s animal communities experienced repeated storm and wave activities, preserving them in place, the Taichoute discovery sheds light on a different aspect of marine life.