Neseuretus tristani Trilobite on Matrix – Ordovician – Valongo, Portugal An exceptional Neseuretus tristani trilobite preserved on its original shale matrix from the Llandeilo Series (Middle Ordovician) of Valongo, Portugal. This classic European species is highly sought after for its distinctive morphology and the outstanding quality of preservation found in the famous Portuguese Ordovician deposits. The trilobite measures 13.2 × 5.4 × 1 cm and is preserved in remarkable three-dimensional relief. The specimen displays a beautifully defined cephalon, numerous well-preserved thoracic segments, and a complete pygidium, allowing the anatomy of this ancient marine arthropod to be appreciated in excellent detail. The dark slate matrix creates a striking contrast with the fossil, emphasizing its natural form and making it an impressive display piece. The preparation has been carefully carried out to expose the trilobite while preserving the surrounding matrix and the specimen's authentic character. A handwritten identification label remains attached to the reverse side, adding historical interest and reflecting the specimen's provenance from an older collection. An outstanding trilobite for collectors of Paleozoic fossils, natural history enthusiasts, or cabinet-of-curiosities displays. Transparent plastic display stand included.