SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from the Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley, Worcestershire.

Paul D Stewart / Illustration of trilobuite (Paradoxides bohemicus), Plate 1. From 'Organization of the Trilobites' by Hermann Burmeister, appearing in the Ray Society translation of his work published in 1846. The Il...

SINCLAIR STAMMERS / Fossil of a Trilobite (Olenellus / Olenellus gilberti Meek) from the Lower Cambrian period, Chisolm shale, Pioche formation, Half Moon mine, Pioche, Nevada, USA. Pete Lawrance collection

Albert Lleal / Trilobite fossils, Spain

Albert Lleal / Trilobite fossil, Spain

Chris Mattison / Trilobite beetle (Duliticola hoiseni). Kinabalu National Park, Sabah, Borneo.

SINCLAIR STAMMERS / Underside or ventral surface of a trilobite (Acaste downingae) showing the biramous limb attachment points, from Silurian period, Wenlock limestone, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from the Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Trilobite (Flexicalymene meeki) rolled showing defensive behaviour, from the Ordovician period, found in the Richmond Formation, USA

SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite, Dudley locust (Calymene blumenbachii) rolled in defensive position, from Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite, Dudley locust (Calymene blumenbachii) rolled in defensive position, from Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from the Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

MYN / Joris van Alphen / Trilobite beetle larva (Duliticola sp.) female, Crocker Range, Borneo, Malaysia. meetyourneighbours.net project

MYN / Joris van Alphen / Trilobite beetle larva (Duliticola sp.) female, Crocker Range, Borneo, Malaysia. meetyourneighbours.net project

Juan Carlos Munoz / Fossil of a Trilobite (Ceratarges sp) from the Devonian period, Asturias, Spain

Juan Carlos Munoz / Fossil of a Trilobite from the Cambrian period.

Hiroya Minakuchi / Trilobite fossil

Chien Lee / Net-winged Beetle (Duliticola sp) neotenic female remains in her larval form even when mature, Pulong Tau National Park, Gunung Murud, Sarawak, Borneo, Malaysia

Chien Lee / Net-winged Beetle (Duliticola sp) neotenic female remains in her larval form even when mature, Pulong Tau National Park, Gunung Murud, Sarawak, Borneo, Malaysia

Hiroya Minakuchi / Trilobite (Psychopyge elegans) fossil

Hiroya Minakuchi / Trilobite fossil

Hiroya Minakuchi / Trilobite fossils

Thomas Marent / Net-winged Beetle (Duliticola sp), Gunung Leuser National Park, northern Sumatra, Indonesia

SINCLAIR STAMMERS / Fossil of Trilobite (Andegavia cf. simplex) from the Devonian period, Eifelian, Hamar Laghdad, Morocco. Pete Lawrance collection

SINCLAIR STAMMERS / Close up of fossil of the schizochroal eye of the Trilobite (Plesiomavinella pujrarii) (Wolfart 1968) from the Devonian period, Givetian, Sleasica Formation, Tikani, La Paz, Bolivia. Pete Lawrance col...

SINCLAIR STAMMERS / Fossils of Burrowing trilobites (Homalonotus / Trimerus linares) (Salter) from the Middle Devonian period, Patacamaya, Bolivia. The cylindrical body shape plus shovel nose headshield possibly indicate...

SINCLAIR STAMMERS / Fossil of a Trilobite (Olenellus / Olenellus gilberti Meek) from the Lower Cambrian period, Chisolm shale, Pioche formation, Half Moon mine, Pioche, Nevada, USA. Pete Lawrance collection

SINCLAIR STAMMERS / Fossils of Middle Cambrian Trilobites (Ellipsocephalus hoffi) (Schlotheim 1823) from the Jince formation, Mount Konicek, Czech Republic, individuals are about 15mm in length. Pete Lawrance collection.

SINCLAIR STAMMERS / Fossil of a trilobite (Paradoxides gracilis Boeck 1827) from the Middle Cambrian period, Jince Formation, P. gracilis zone, Vinice, Jince, Vystrkov, Czech Republic. Pete Lawrance collection.

SINCLAIR STAMMERS / Fossil of a Trilobite (Clymenella / Eohomalonotus sp) from the Ordovician period, Uppermost Llanvirn Series, Rehamna, Morocco. The expanded axial segments and shovel nose snout indicate a burrowing mo...

SINCLAIR STAMMERS / Fossils of Elrathia kingi trilobite, from the Wheeler Shale, Utah, USA (size:17-32mm)

SINCLAIR STAMMERS / Fossils of Elrathia kingi trilobite, from the Wheeler Shale, Utah, USA (size: 17-32mm)

SINCLAIR STAMMERS / Fossil of Flexicalymene meeki trilobite rolled up, Ordovician period, from the Richmond formation strata of Mount Orab, Ohio, USA

SINCLAIR STAMMERS / Mid Cambrian Trilobite (Altiocculus harrisi) Upper Wheeler Shale, Harris quarry, Wheeler Ampitheater, House Range, Utah, USA

Graham Eaton / Fossil Trilobite (Dalmanites myops) from Silurian period, Builth Wells, Wales, UK

John Cancalosi / Trilobite fossil

John Cancalosi / Trilobite fossils

John Cancalosi / Trilobite fossil

Juan Manuel Borrero / Fossil trilobite genus Paradoxides, Morocco, March 2009

Nick Garbutt / Female Trilobite beetle (Duliticola sp) Lycidae. Female remains in larval form when mature. Mt Kinabalu, Sabah, Borneo, Malaysia

Nick Garbutt / Female Trilobite beetle (Duliticola sp) Lycidae. Female remains in larval form when mature. Mt Kinabalu, Sabah, Borneo, Malaysia

Tony Heald / Trilobite beetle (Duliticola paradoxa) larva, female, Mount Kinabalu, Sabah, Borneo, September

Tony Heald / Trilobite beetle (Duliticola paradoxa) larva, female, Mount Kinabalu, Sabah, Borneo, September

John Cancalosi / Fossil Trilobite (Redlichia takooensis), Lower (Early) Cambrian Period, Emu Bay Shale formation, Kangaroo Island, South Australia

John Cancalosi / Trilobite fossils, (Cerurus ocekaspis) left and (Sumphururus ytripocis) right, Ordovician age, Zagoura, Morocco

John Cancalosi / Trilobite (Sumphururus ytripocis) fossils, Ordovician age, Zagoura, Morocco

John Cancalosi / Fossil Trilobite (Redlichia takooensis), Lower (Early) Cambrian Period, Emu Bay Shale formation, Kangaroo Island, South Australia

John Cancalosi / Trilobite fossils (Acadoparadoxides) from the Cambrian Period (520 million years ago), Djebel Ougnat, Morocco

Albert Lleal / Trilobite (Flexicalymene sp) fossils of the Ordovician period 490 - 443 million years ago from Morroco

Albert Lleal / Trilobite (Dalmanites camprodonensis) fossil from the Silurian period, Girona, Spain

Thomas Marent / Net-winged Beetle (Duliticola sp) females, Kinabalu National Park, Sabah, Borneo, Malaysia

Nick Garbutt / Trilobite beetle (Duliticola paradoxa) larva foraging over moss-covered log. Mt Kinabalu, Sabah, Borneo.

Nick Garbutt / Trilobite beetle (Duliticola paradoxa) larva foraging over moss-covered log. Mt Kinabalu, Sabah, Borneo

John Cancalosi / Fossilised Trilobite {Cheiruridae Ordovician} 350 million years old, Morocco

Peter Scoones / Trilobite beetle, female retains larval appearance (Duliticola paradoxa) Sabah, Borneo

John Cancalosi / Trilobite fossils from middle cambrian period {Bolaspidella housensis} USA

John Cancalosi / Trilobite fossils {Xenasaphus devexus} mid- devonian Russia

John Cancalosi / Trilobite fossil from middle cambrian period {Bolaspidella housensis} USA

John Cancalosi / Trilobite fossil from silurian period {Arctinurus boltoni} 410m-yrs-old USA

Sumio Harada / Trilobite (Olenoides sp) fossil from the Middle Cambrian era, specimen from the Rocky Mountains, North America

Sumio Harada / Trilobite (Olenoides sp) fossil from the Middle Cambrian era, specimen from the Rocky Mountains, North America

Mark Moffett / Net-winged Beetle (Duliticola sp) on rainforest floor, Mt Kinabalu, Sabah, Borneo

Mark Moffett / Net-winged Beetle (Duliticola sp), Borneo

STEPHEN BOLWELL / Trilobite fossil, Smithsonian, Washington DC, USA

Paul D Stewart / Fossil Trilobite (Triarthus eatoni) showing rare pyrites preservation of the limbs and antennae. From the late Ordovician 'Beecher's Bed' of Oneida County, New York, USA. The site is named after Charl...

Paul D Stewart / Illustration of Trilobite (Phacops latifrons) enrolled and open, from 'Organization of the Trilobites' by Hermann Burmeister, appearing in the Ray Society translation of his work published in 1846. Th...

Paul D Stewart / Trilobite (Asaphus platycephalus) from 'Organization of the Trilobites' by Hermann Burmeister, appearing in the Ray Society translation of his work published in 1846. The Illustrations and engravings...

Paul D Stewart / Illustration of Trilobite (Homalonotus armatus) from 'Organization of the Trilobites' by Hermann Burmeister, appearing in the Ray Society translation of his work published in 1846. The illustrations a...

Graham Eaton / Cast of the Trilobite (Trinucleus ornatus) from the Ordovician period, Builth Wells, Wales, UK

Premaphotos / Net-winged beetle (Duliticola sp), trilobite larva showing its armour and warning coloration, in rainforest, Borneo

Premaphotos / Net-winged beetle (Duliticola sp), trilobite larva showing its armour and warning coloration, in rainforest, Borneo

John Cancalosi / Fossil trilobite {Conocoryphe sp} from Cambrian Era, Eastern Europe