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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 ...
The trilobite Protolenus is shown in a side view. The digestive system is seen in blue, the hypostome, or mouth structure, in green (far left) and the labrum, a bulbous structure over the mouth ...
Ellipsocephalus Zenker, 1833, [1] is a genus of blind Cambrian trilobite, comprising benthic species inhabiting deep, poorly lit or aphotic habitats. [2] E. hoffi is a common trilobite mainly from central Europe (Czech Republic). [3] Ellipsocephalus sanctacrucensis
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.
In contrast to the related Phacops, Eldredgeops generally has a raised ridge along the ventral margin of the cephalon, the glabella is more inflated, the lateral parts of the preoccipital ring are rectangular (and not round), the palpebral area and palpebral lobe are larger than in P. latifrons (the type species of Phacops), and there is no ...
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]
Trilobites were still present and like the Ordovician Silurian rocks are a better source of trilobite fossils than the state's Cambrian deposits. Also like the Ordovician, the superiority of Silurian rocks as a source of trilobites is due to the Silurian rocks being more accessible to collectors than the older ones. [ 1 ]
Ptychoparia is a genus of ptychopariid trilobites, and is the type genus of the family Ptychopariidae, and the order Ptychopariida.. Fossils of the various species are found in Middle Cambrian-aged marine strata of Eurasia and North America, about 513 ± 0.3 to 499 ± 1.7 million years ago.