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Calymene blumenbachii brongniart, trilobiteThis trilobite originates from the 425 million year old Devonian Wenlock Limestone, Dudley, Worcestershire
Phacops, a fossil trilobiteThis Moroccan Devonian Phacops is enrolled, measuring 4.5 cm in width, and has a glabella covered in tubercles
Dalmanites, a fossil trilobiteThis example of the Silurian trilobite Dalmanites, 4.2 cm long, shows to perfection the complex dorsal exoskeleton of these extinct arthropods
Asaphus (Neoasaphus) kowalewskii, stalk- eyed trilobiteA complete 3-dimensional stalk-eyed trilobite measuring about 5 cms, discovered at Wolchow River, near St. Petersburgh, Russia. The specimen dates back to the Middle Ordovician period
Calymene blumenbachii, trilobite modelDepicted here is a model of a Silurian-Devonian trilobite. Trilobites had a carapace, or shell. They were arthropods as crustaceans, spiders and insects are today
Ogygiocaris, a fossil trilobiteComplete specimen of the Welsh Ordovician trilobite Ogygiocaris, measuring 3.8 cm in length and showing the three-lobed dorsal exoskeleton
Dorsal & Ventral Isotelus platycephalusSyntype (?Holotype by monotypy) of Asaphus, now Isotelus platycephalus (Stokes, 1824) Ordovician, Black River Group; St Josephs Island, Lake Huron, Ontario Bigsby Colln. Date: 1824
Erbenochile erbeni (Alberti)Tower-Eyed Trilobite from the Timrahrhart Formation, Morocco
Trimerus, a fossil trilobiteFully preserved, 10 cm long specimen of the Silurian trilobite Trimerus
Encrinurus variolaris, trilobiteTrilobites had a carapace, or shell which was divided into three parts. Trilobites were arthropods as crustaceans, spiders and insects are today
Trilobites, fossil group of extinct marine arthropods that form the class Trilobita.. They existed from the early Cambrian to the Permian era
Cambrian trilobites from the Falkland IslandsTrilobites from a cobble of archaeocyathan limestone from Port Purvis: PS 218, specimen number NHM PI PO 12074 in the collection of the Palaeontological Department of The Natural History Museum
Agnostid trilobite of Cambrian age, found in deep water. It is a blind trilobite of only a few millimetres long, with only two thoracic segments
Remopeurides, a fossil trilobiteProbably planktonic, Remopeurides is a small trilobite - this Scottish Ordovician example being less than 2 cm long - with an inflated glabella
Elrathia kingii, trilobitesElrathia kingii in rock matrix, from Middle Cambrian, Wheeler Shale, House Range, Utah, USA
John William Salter (1820-1869)Portrait of John William Slater, a geologist and palaeontologist for the Geological Survey. He worked on the classification of trilobites
Phacops rana africanus, trilobiteThis trilobite shown in the balled position originated from the Devonian period c. 380-370 million years ago, in the Tifariti area, Spain
Trinucleus, a fossil trilobiteThe pitted cephalic fringe is clearly seen in this 1.3 cm wide specimen of Trinucleus from the Ordovician of Wales
Trinodus, a fossil trilobiteMeasuring less than a cm, this Scottich Ordovician trilobite Trinodus has a much reduced thorax between the larger head and cephalon
Calymene, trilobiteThis specimen dates from the Middle Silurian, Worcestershire. Trilobites are among the earliest fossils known and ranged from the Lower Cambrian (540 million years ago)
Wanneria walcottana, trilobite
Leonaspis coronata, trilobiteOne of the smaller trilobites growing to a maximum length of 2cm. The spines have been well-preserved in this specimen
Encrinurus punctatus, trilobitesA specimen of rock containing several fossils of the Trilobite Encrinurus punctatus. Encrinurus had eyes on stalks and grew to a size of approximatey 5cm
Angelina, stretched trilobiteAngelina grew up to a length of 6cm. The thorax was made up of 15 segements with spines. Trilobites were arthropods and had exoskeletons as crustaceans, spiders and insects do today
Calymene blumenbachii, trilobitesSpecimens of this Devonian trilobite in various positions. Trilobites had a carapace, or shell. Trilobites were arthropods as crustaceans, spiders and insects are today
Calymene blumenbachii, trilobiteA well-known convex Silurian trilobite originating from Worcestershire, England. Trilobites were arthropods as crustaceans, spiders and insects are today
Biceratops, trilobiteBiceratops, a Cambrian trilobite. Trilobites had a carapace, or shell was divided into three parts. Trilobites were arthropods as crustaceans, spiders and insects are today
Phacops rana, trilobiteA Devonian trilobite from Ontario, Canada. A convex trilobite with eleven thoracic segments; the eyes include a few very large lenses
Naraoia compacta, trilobite
Butterfly stone Hu-die-shih trilobitesTrilobite Drepanura; inferred Upper Cambrian, Shantung Province, China. Mounted slab from Keeper?s Meeting Room
Trinucleus, trinucleid trilobiteThis Trinucleid trilobite grew up to 3cm long. Specimen originating from Ordovician rocks of Builth, Wales