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  2. Trilobite - Wikipedia

    en.wikipedia.org/wiki/Trilobite

    Although intra-species trilobite diversity seems to have peaked during the Cambrian, [30] trilobites were still active participants in the Ordovician radiation event, with a new fauna taking over from the old Cambrian one. [31] Phacopida and Trinucleioidea are characteristic forms, highly differentiated and diverse, most with uncertain ...

  3. Phacops - Wikipedia

    en.wikipedia.org/wiki/Phacops

    Phacops is a genus of trilobites in the order Phacopida, family Phacopidae, that lived in Europe, northwestern Africa, North and South America and China from the Late Ordovician until the very end of the Devonian, [2] with a broader time range described from the Late Ordovician. [3]

  4. Trinucleioidea - Wikipedia

    en.wikipedia.org/wiki/Trinucleioidea

    Trinucleioidea is a superfamily of trilobites. Traditionally placed within the Asaphida, it is now sometimes considered its own order, Trinucleida. [1] [2] Damghanampyx ghobadipour fossil from Lashkark Formation, Ordovician, Damghan, Iran

  5. Trinucleidae - Wikipedia

    en.wikipedia.org/wiki/Trinucleidae

    Trinucleidae is a family of small to average size asaphid trilobites that first occurred at the start of the Ordovician and became extinct at the end of that period. It contains approximately 227 species divided over 51 genera in 5 subfamilies. [1] The most conspicuous character is the wide perforated fringe of the head.

  6. Redlichia - Wikipedia

    en.wikipedia.org/wiki/Redlichia

    Redlichia is a genus of redlichiid trilobite in the family Redlichiidae, with large to very large species (up to 35 centimetres or 14 inches long).Fossils of various species are found in Lower Cambrian ()-aged marine strata from China, Korea, Pakistan, the Himalayas, Iran, Spain, southern Siberia, and Antarctica, and from Middle Cambrian ()-aged marine strata of Australia.

  7. Triarthrus - Wikipedia

    en.wikipedia.org/wiki/Triarthrus

    Triarthrus is an average size trilobite (up to about 5 centimetres or 2.0 inches) and its moderately convex body is about twice as long as wide (excluding spines). Like in all Olenidae, the headshield (or cephalon ) of Triarthrus has opisthoparian sutures , and the right and left free cheeks that they define are yoked.

  8. Eldredgeops rana - Wikipedia

    en.wikipedia.org/wiki/Eldredgeops_rana

    Eldredgeops rana (formerly Phacops rana) is a species of trilobite from the middle Devonian period. Their fossils are found chiefly in the northeastern United States , and southwestern Ontario . Because of its abundance and popularity with collectors, Eldredgeops rana was designated the Pennsylvania state fossil by the state's General Assembly ...

  9. Asaphida - Wikipedia

    en.wikipedia.org/wiki/Asaphida

    Asaphida is a large, morphologically diverse order of trilobites found in marine strata dated from the Middle Cambrian until their extinction during the Silurian. Asaphida contains six superfamilies (Anomocaroidea, Asaphoidea, Cyclopygoidea, Dikelocephaloidea, Remopleuridoidea and Trinucleioidea), but no suborders.