swap_horiz Atops Alternatives

1

Dikelocephalus

Dikelocephalus is a large Late Cambrian trilobite genus known from Wisconsin, USA, including material from the St. Lawre...

Large North American Ptychopariida Late Cambrian

7.0 Good

2

Crepicephalus

Crepicephalus is a Late Cambrian trilobite genus from North America that serves as the namesake of the Crepicephalus Bio...

North American Ptychopariida Late Cambrian Zone Fossil

6.2 Fair

3

Ptychaspis

Ptychaspis is a Late Cambrian trilobite genus from North America whose name defines the Ptychaspid biomere, a key concep...

North American Late Cambrian Zone Fossil Ptychaspidida

6.0 Fair

4

Elvinia

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

North American Ptychopariida Late Cambrian Zone Fossil

6.0 Fair

5

Saukia

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

North American Ptychopariida Late Cambrian Zone Fossil

6.0 Fair

6

Cedaria

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

North American Ptychopariida Late Cambrian Zone Fossil

6.0 Fair

7

Irvingella

Irvingella is a Late Cambrian trilobite genus valued for intercontinental biostratigraphic correlation, with occurrences...

North American Ptychopariida Late Cambrian Zone Fossil

5.8 Mediocre

8

Bonnia

A Middle Cambrian trilobite from North America, known from Cambrian strata of the western United States and used in regi...

Small North American Cambrian Ptychopariida

5.8 Mediocre

9

Alokistocare

Middle Cambrian marjumiid trilobite from North America, common in carbonate platform deposits of the western interior Un...

North American Cambrian Ptychopariida Zone Fossil

5.8 Mediocre

10

Ehmaniella

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

Small North American Cambrian Ptychopariida

5.8 Mediocre

11

Saratogia

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

North American Ptychopariida Late Cambrian Zone Fossil

5.5 Mediocre

12

Parabolina

Late Cambrian trilobite widely used as a biostratigraphic index fossil for upper Cambrian zones, particularly in Scandin...

Scandinavian Ptychopariida Late Cambrian Olenidae

5.5 Mediocre

13

Aphelaspis

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

North American Ptychopariida Late Cambrian Zone Fossil

5.3 Mediocre

14

Pterocephalia

Late Cambrian trilobite from North America of the family Pterocephaliidae, known for its broad pygidium bearing prominen...

North American Ptychopariida Late Cambrian Zone Fossil

5.2 Mediocre

15

Parabolinella

Late Cambrian trilobite closely related to Parabolina, known from Scandinavia and employed in upper Cambrian biostratigr...

Scandinavian Ptychopariida Late Cambrian Olenidae

5.2 Mediocre

16

Dunderbergia

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

Small North American Ptychopariida Late Cambrian

5.2 Mediocre

17

Taenicephalus

Late Cambrian trilobite from North America belonging to the Saukiidae, used as an index fossil for biostratigraphic zona...

North American Ptychopariida Late Cambrian Illaenidae

5.0 Mediocre

18

Chancia

Upper Cambrian trilobite from North America known from Franconian Stage deposits, used in biostratigraphic correlation o...

Small North American Cambrian Ptychopariida

5.0 Mediocre

19

Eurekia

Cambrian trilobite known from deposits in Nevada and other western North American localities, contributing to reconstruc...

Small North American Ptychopariida Late Cambrian

5.0 Mediocre

20

Maryvillia

Maryvillia is a Cambrian trilobite from eastern North America, named after Maryville, Tennessee, where early specimens w...

Small North American Ptychopariida Late Cambrian

4.8 Poor