Description
Ogyginus corndensis Trilobite Fossil – Llandeilo Series, Builth Wells, Wales
Presented here is a genuine Ogyginus corndensis trilobite fossil discovered within the Llandeilo Series of the Ordovician System near Builth Wells in Powys, Wales, United Kingdom. This remarkable fossil dates to the Middle Ordovician Period during the Darriwilian Stage, approximately 467–458 million years ago, when Wales was covered by a deep marine basin rich in diverse invertebrate life.
Trilobites are among the most iconic fossils of the Paleozoic Era and represent one of the earliest successful groups of complex marine arthropods. Fossils from the Welsh Ordovician are particularly important to palaeontology because they helped establish the early study of trilobite evolution and Ordovician stratigraphy.
This specimen has been carefully selected as an attractive collector-quality fossil, and the listing photographs show the exact fossil you will receive. The trilobite includes a Certificate of Authenticity lifetime guarantee generic card, confirming the fossil is genuine.
Full sizing and scale can be seen in the listing photographs.
Ogyginus corndensis – A Classic Welsh Ordovician Trilobite
The trilobite Ogyginus corndensis belongs to a group of large, broad trilobites that were common inhabitants of Ordovician marine environments.
Taxonomic classification includes:
• Phylum: Arthropoda
• Class: Trilobita
• Order: Asaphida
• Family: Asaphidae
• Genus: Ogyginus
• Species: Ogyginus corndensis
The genus Ogyginus is closely related to the well-known trilobite Ogygiocarella, another species frequently found in the Ordovician rocks of Wales.
Members of the Asaphidae were generally large trilobites with broad, smooth exoskeletons and well-developed compound eyes, adapted for life on or within the seafloor sediments.
Trilobite Anatomy and Morphological Features
Like all trilobites, Ogyginus corndensis possessed a segmented exoskeleton divided into three major sections.
These anatomical regions include:
• Cephalon (head shield) – containing the compound eyes and mouthparts
• Thorax – consisting of articulated segments allowing flexibility
• Pygidium (tail shield) – the fused posterior segment
Typical features of Ogyginus trilobites include:
• A broad oval body shape
• Smooth exoskeleton lacking strong spines
• Prominent crescent-shaped compound eyes
• Numerous thoracic segments providing flexibility
• Well-developed axial lobe running down the centre of the body
These trilobites likely lived on the seafloor, where they crawled across sediment surfaces in search of food such as organic debris or small organisms.
Like modern arthropods, trilobites periodically molted their exoskeleton as they grew, leaving behind fossilised remains that are commonly found in sedimentary rocks.
Llandeilo Series Geological Context
The fossil originates from the Llandeilo Series, a subdivision of the Ordovician rocks exposed across parts of mid-Wales, including the region around Builth Wells.
These rocks date to the Darriwilian Stage of the Middle Ordovician, approximately 467–458 million years ago.
During this time, Wales formed part of a marine basin located along the margins of the ancient continent Avalonia. Much of the region was submerged beneath relatively deep marine waters where fine sediments accumulated on the seabed.
The sedimentary rocks typically consist of:
• Mudstones and shales
• Fine-grained marine sediments
• Occasional volcanic ash layers associated with Ordovician volcanism
These rocks preserve a rich marine fossil assemblage including:
• Trilobites such as Ogyginus
• Brachiopods
• Graptolites
• Bivalves and gastropods
• Early echinoderms
Ordovician Marine Ecosystems
The Ordovician Period was one of the most important intervals in the history of life on Earth. During this time, marine biodiversity increased dramatically in an event known as the Great Ordovician Biodiversification Event.
Marine ecosystems became increasingly complex, with diverse communities of invertebrates inhabiting seafloor environments.
Trilobites such as Ogyginus corndensis were important components of these ecosystems, serving as both predators and scavengers within benthic marine communities.
The fossil record preserved in the Ordovician rocks of Wales provides valuable insight into these early marine ecosystems.
Fossilisation and Preservation
Trilobites possessed a hard calcite-rich exoskeleton, which greatly increased the likelihood of fossil preservation. When a trilobite died or shed its exoskeleton during molting, the remains settled onto the seabed where they became buried within fine sediment.
Over millions of years, mineralisation preserved the trilobite within the surrounding rock layers, often retaining fine details of the exoskeleton including segmentation and eye structures.
The fine-grained sediments of the Welsh Ordovician deposits frequently preserve trilobites in remarkable detail.
Authenticity and Collector Information
• Genuine fossil specimen – not a cast or replica
• Fossil Type: Ogyginus corndensis Trilobite
• Phylum: Arthropoda
• Class: Trilobita
• Order: Asaphida
• Geological Formation: Llandeilo Series
• Age: Ordovician Period, Darriwilian Stage (~467–458 million years old)
• Locality: Builth Wells, Powys, Wales, United Kingdom
• Includes Certificate of Authenticity lifetime guarantee generic card
• The exact fossil shown in the photographs is the specimen you will receive
This genuine Ogyginus corndensis trilobite from the Ordovician deposits of Wales represents a superb addition to any trilobite fossil collection, Paleozoic fossil display, or natural history cabinet, preserving a remarkable example of marine life from the ancient Ordovician seas that covered Wales nearly 460 million years ago.
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