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1. Trilobites: Trilobites, extinct Arthropoda, formerly classified with the Crustacea, but of late years relegated to the Arachnida, which occurred abundantly in seas of the Cambrian and Silurian periods, but disappeared entirely at the close of the Palaeozoic epoch. Both their origin ... [100%] 2022-09-02

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1. Trilobite: Trilobites are hard-shelled, segmented members of the phylum Arthropoda and the class Trilobita that appear in the fossil record for almost 300 million years—from about 540 to 251 million years ago (mya). They existed throughout almost all of ... [86%] 2023-02-04
2. Trilobite: Trilobites are hard-shelled, segmented members of the phylum Arthropoda and the class Trilobita that appear in the fossil record for almost 300 million years—from about 540 to 251 million years ago (mya). They existed throughout almost all of ... [86%] 2023-02-04
3. Trilobite: Trilobites first appeared some 600 Ma. during the Cambrian period. [86%] 2023-02-19 [Invertebrates]
4. Trilobite: Trilobites (/ˈtraɪləˌbaɪts, ˈtrɪlə-/; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest known groups of arthropods. (Class of extinct, Paleozoic arthropods) [86%] 2023-12-23 [Trilobites] [Cambrian first appearances]...
5. Trilobite zone: Trilobites are used as index fossils to subdivide the Cambrian period. Assemblages of trilobites define trilobite zones. (Earth) [61%] 2023-12-05 [Cambrian trilobites] [Stratigraphy]...