Best Ptychopariida

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...

Elrathia is an extinct genus of ptychopariid trilobite that lived during the Middle Cambrian period. Fossils of this marine arthropod are abundantly preserved in the Wheeler Shale formation in Utah, USA. Due to the vast quantities found, Elrathia kingii is one of the most commercially available and...

Middle Cambrian ptychopariid trilobite from North America, commonly recovered from the Wheeler Shale and related Cambrian formations of the western USA.

Dikelocephalus is a large Late Cambrian trilobite genus from Wisconsin, USA, notable for its size and abundance in the St. Lawrence Formation.

Middle to Late Cambrian trilobite from the Great Basin of western North America, a ptychopariid known from multiple Cambrian formations across the region.

Middle Cambrian trilobite notable for the complete absence of eyes, abundant in Bohemian and Iberian Cambrian deposits and a classic example of trilobite blindness.

A Cambrian trilobite genus first described from Bohemia by Joachim Barrande; its type species Ellipsocephalus hoffi is among the most recognized Czech Cambrian fossils.

An Upper Cambrian trilobite from Scandinavia and Wales that serves as the index fossil for the Olenus biozone, associated with low-oxygen seafloor environments.

Crepicephalus is a Late Cambrian trilobite genus from North America that serves as the namesake of the Crepicephalus Biozone used in Cambrian correlation.

Middle Cambrian trilobite from Bohemia that serves as the type genus of order Ptychopariida, one of the most taxonomically diverse trilobite groups.

Late Cambrian trilobite that defines the Cedaria biozone, a key division in Upper Cambrian stratigraphy widely used for correlation across North America.

An Ordovician trilobite of the family Dionididae, known from European Ordovician deposits and characterized by its distinctively wide cephalic border morphology.

Saukia is a Late Cambrian trilobite genus belonging to family Saukiidae, found in North America and Asia, and associated with the Sauk megasequence.

Elvinia is a Late Cambrian trilobite genus from North America used as an index fossil for the Elvinia Biozone in the upper Franconian Stage.

Cambrian trilobite from Bohemia described by Joachim Barrande in his landmark 19th-century monograph on Silurian fauna, making it one of his foundational study genera.

Middle Cambrian marjumiid trilobite from North America whose fossils serve as index fauna for stratigraphic zones in the Basin and Range province.

Middle Cambrian marjumiid trilobite from North America, common in carbonate platform deposits of the western interior United States and used in biostratigraphy.

Cambrian trilobite from Siberia used as an index fossil for the Botomian Stage, aiding global correlation of Lower Cambrian strata across continents.

A Middle Cambrian trilobite from North America, known from Cambrian strata of the western United States and used in regional biostratigraphic correlation of Laurentian sequences.

Irvingella is a Late Cambrian trilobite genus valued for intercontinental biostratigraphic correlation, with occurrences in North America, Europe, Asia, and Australia.

A Cambrian ptychopariid trilobite described by Barrande in 1846, Agraulos is known primarily from Middle Cambrian deposits in Bohemia.

Late Cambrian trilobite widely used as a biostratigraphic index fossil for upper Cambrian zones, particularly in Scandinavia and Baltic paleocontinental regions.

Late Cambrian saukiid trilobite from North America, with early specimens described from New York State, used in Upper Cambrian biostratigraphic correlation.

Shumardia is a small Ordovician trilobite genus named after Benjamin F. Shumard, known for its diminutive size and reduced eyes.

Late Cambrian trilobite defining the Aphelaspis biozone, a key stratigraphic marker for the Steptoean Stage in the North American Cambrian time scale.

A Late Cambrian trilobite genus from North America, classified within the order Ptychopariida and known from Upper Cambrian deposits of the United States.

Dunderbergia is a Late Cambrian trilobite from the Great Basin of Nevada, USA, named after Dunderberg Peak in the Eureka District.

Late Cambrian trilobite closely related to Parabolina, known from Scandinavia and employed in upper Cambrian biostratigraphic correlation across the Baltic region.

Late Cambrian trilobite from North America of the family Pterocephaliidae, known for its broad pygidium bearing prominent marginal and pleural spines.