Best Cambrian

Anomalocaris canadensis was a large marine animal of the Cambrian Period known from fossils in Canada's Burgess Shale and related deposits. It had stalked compound eyes, a circular mouth structure, paired frontal appendages for handling prey, and lateral swimming flaps along its body. Classified amo...

James Valentine was a prominent American evolutionary paleontologist whose research significantly advanced the understanding of marine diversity and the fossil record. He is particularly recognized for his extensive work on the evolutionary significance of the Cambrian explosion, detailing how compl...

Opabinia regalis was a small marine animal from the middle Cambrian Burgess Shale of British Columbia, Canada. It had five stalked eyes, lateral swimming flaps, and a flexible frontal proboscis ending in a grasping structure that likely moved food toward its ventral mouth. Its unusual anatomy has ma...

Hallucigenia sparsa is a small Cambrian lobopodian known from fossils in the Burgess Shale of British Columbia, Canada. Its unusual anatomy led early researchers to reconstruct it upside down, treating its paired legs as dorsal tentacles and its stiff dorsal spines as supports for walking. Later dis...

Allison Daley is a paleontologist specializing in the study of early animal evolution during the Cambrian Explosion, with a focus on ancient marine arthropods. Her research extensively covers radiodonts, a group of stem-group arthropods, including notable species like *Anomalocaris* and *Hurdia*. Da...

Haikouichthys ercaicunensis is a small, fishlike chordate from the Early Cambrian Chengjiang biota of Yunnan, China, dating to roughly 518 million years ago. Fossils show a distinct head region, repeated muscle blocks, gill structures, and fin folds, features associated with early vertebrate organiz...

Harry Blackmore Whittington (1916–2010) was a prominent British paleontologist at the University of Cambridge. From the 1970s through the 1980s, he led a comprehensive re-examination of the Burgess Shale fossil deposits in the Canadian Rockies alongside his students Simon Conway Morris and Derek Bri...

Martin Smith is a British paleontologist whose research focuses on Cambrian fossils and the early evolution of invertebrate animals. His work has examined the anatomy and evolutionary relationships of early mollusks, worms, and fossils whose affinities are difficult to determine from preserved morph...

Pikaia gracilens is an extinct, small-bodied chordate known from Middle Cambrian fossils in the Burgess Shale of British Columbia, Canada. Specimens preserve a slender body with repeated, chevron-shaped muscle blocks and a longitudinal supporting structure interpreted as a notochord. Pikaia is impor...

Elrathia kingi is a common trilobite fossil discovered primarily in the Middle Cambrian Wheeler Shale of Utah. It represents one of the most abundant trilobite species globally. These ptychopariida fossils are notable for their distinctive, deeply furrowed exoskeletons and widespread commercial avai...

Middle Cambrian trilobite widespread across Baltica and Avalonia, widely used as a biostratigraphic index fossil for the middle Cambrian Series 3.

Harry B. Whittington was a prominent British paleontologist specializing in Cambrian fossils. His meticulous re-examination of the Burgess Shale in the 1960s dramatically reshaped our understanding of early animal evolution. He significantly advanced the study of trilobites and other extraordinary C...

Olenoides serratus is an iconic trilobite species dating back to the Cambrian period. Found within the Burgess Shale of British Columbia, it’s notable for remarkably well-preserved anatomical details, specifically its distinctive serrated body and biramous appendages. These structures offer crucial...

Nevadella is a genus of olenellid trilobites from the Early Cambrian of western North America. Fossils assigned to the genus are used in regional biostratigraphy because their occurrence helps paleontologists correlate rock layers of similar age. Like other olenellids, Nevadella had a broad cephalon...

Allison R. Palmer was an American paleontologist whose research on Cambrian trilobites established influential biostratigraphic zones for North America.

Marrella splendens is a small Cambrian arthropod and the most commonly collected animal fossil from the Burgess Shale of British Columbia, Canada. Charles Doolittle Walcott described it in 1912, and its anatomy includes a head shield with paired spines, long antennae, and numerous delicate limbs. It...

Elrathia kingii is an extinct ptychopariid trilobite from the Middle Cambrian Wheeler Shale of western Utah. Its fossils are exceptionally abundant in parts of that formation, making it one of the most familiar and commercially collected North American trilobites. The species is recognized by its br...

Wiwaxia corrugata is a soft-bodied Cambrian animal best known from exceptionally preserved fossils in the Burgess Shale of British Columbia, Canada. Its body bore overlapping rows of mineralized scales called sclerites, along with two rows of longer defensive spines, while its underside carried a ra...

Douglas Erwin is an American paleobiologist and curator at the Smithsonian National Museum of Natural History. He is widely recognized for his extensive research on the end-Permian mass extinction, the most severe biodiversity crisis in Earth's history. Erwin's work focuses on the evolutionary dynam...

Simon Conway Morris is a British paleontologist specializing in the Cambrian period. His significant contributions include pioneering research on the Burgess Shale fossil site and the discovery of *Hallucigenia*, a groundbreaking extinct arthropod. He focuses on understanding evolutionary patterns w...

Adam Sedgwick was an English geologist, Anglican priest, and long-serving professor of geology at the University of Cambridge. He established the Cambrian geological system in 1835 from his study of older rock sequences in Wales, while Roderick Murchison defined the neighboring Silurian system; disa...

Paradoxides davidis is a species of large trilobite that lived during the Middle Cambrian period, with fossils primarily found in Wales. It is recognized as one of the earliest trilobite species to be formally described from the British Isles, contributing significantly to early paleontological stud...

Naraoia is an extinct genus of soft-bodied arthropods that thrived during the Cambrian period, famously found in the Burgess Shale of British Columbia, Canada. It is characterized by a large, bivalved carapace that completely covered its segmented body, and it notably lacked a mineralized exoskeleto...

Xystridura is a genus of trilobites from the Middle Cambrian rocks of Australia, particularly deposits in Queensland's Georgina Basin. Its fossils are sufficiently characteristic and geographically useful that Xystridura has been used in biostratigraphic schemes for correlating parts of the Australi...

Nicholas Butterfield is a paleontologist based at the University of Cambridge whose research focuses on the fossil record of Proterozoic and early Cambrian life, particularly early eukaryotes and the exceptional preservation of soft-bodied organisms in ancient marine deposits. His published work has...

James W. Valentine was an American evolutionary paleobiologist who served as a professor at the University of California, Berkeley. He was an authority on the Cambrian explosion, the evolution of animal body plans, and the diversification of marine invertebrates. His work frequently focused on the p...

Jean-Bernard Caron is a French-Canadian paleontologist and curator at the Royal Ontario Museum, where he also serves as a professor at the University of Toronto. He is recognized for leading major field expeditions to the Burgess Shale, particularly the Marble Canyon and Kootenay National Park sites...

Paradoxides is an extinct genus of large trilobites belonging to the order Redlichiida, existing during the Middle Cambrian period. Serving as a crucial biostratigraphic index fossil, its widespread remains help geologists date marine sedimentary rocks globally. Specimens of this genus are among the...

James Hagadorn is an American paleontologist and geologist known for studying Cambrian trace fossils, exceptional preservation, and ancient sedimentary environments.