VERY RARE British Cambrian Trilobite – Tomagnostus fissus – Menevian Series, Hicksii Biozone, Wales – Genuine with COA

Description Extremely Rare British Cambrian Trilobite – Tomagnostus fissus Species: Tomagnostus fissus Geological Age: Middle Cambrian (~510 million years ago) Formation: Menevian Series Biozone: Hicksii Biozone Location: Nine Wells, St David’s, Pembrokeshire, South Wales, United Kingdom This is a very rare British trilobite fossil of the species Tomagnostus fissus, a member of the Agnostida order from the Middle Cambrian. Sourced from the historic locality of Nine Wells, near St David’s in Pembrokeshire, this beautifully preserved specimen dates back over half a billion years, offering a tangible piece of early Paleozoic life. Scientific Classification Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Agnostida Superfamily: Agnostoidea Family: Agnostidae Genus: Tomagnostus Species: fissus Originally described by Salter (1864) and later formally assigned as Tomagnostus fissus, this species plays a vital role in the biostratigraphic division of the Cambrian, especially within the Hicksii Biozone of the Menevian Series. Geological & Depositional Context Stratigraphy: Menevian Series – Middle Cambrian Biozone: Hicksii Biozone – Defined by Paradoxides hicksi, contemporaneous with Tomagnostus fissus Depositional Environment: Fine-grained marine siliciclastic sediments, representing an offshore shelf to deep marine setting rich in early marine arthropod diversity Notable Features: Part of the classic British Cambrian sequence, the Menevian Series is world-renowned for its fossil-rich layers Morphology & Preservation Agnostid Trilobite Morphology: Tomagnostus fissus features a cephalon and pygidium of nearly equal size (isopygous) with a smooth, unornamented exoskeleton. Two or three thoracic segments and a lack of visible eyes are diagnostic of Agnostids – adaptations likely linked to a pelagic lifestyle in deeper Cambrian seas. Specimen Detail: Fossil is preserved in a dark grey to olive shale matrix; see photo with 1cm scale cube for precise measurements. The fossil you see is the exact piece you will receive. Provenance & Handling This unique specimen was discovered at the famous Nine Wells site near St David’s, a globally significant fossil locality in Wales. It was carefully chosen for its quality and has been professionally cleaned and stabilized. Genuine Specimen with Certificate All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. The fossil you see in the photos is the actual one you will receive, not a stock image. This is a rare opportunity to own a scientifically significant, investment-grade example of early arthropod evolution from a historic British Cambrian site.