Agnostida is an order of arthropod which first developed near the end of the Early Cambrian period and thrived during the Middle Cambrian.
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Animals are multicellular, eukaryotic organisms of the kingdom Animalia (also called Metazoa).
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Archaeagnostus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites.
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An arthropod (from Greek arthro-, joint + podos, foot) is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages.
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The Cambrian is the first geological period of the Paleozoic Era, lasting from to million years ago (mya) and is succeeded by the Ordovician.
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Cambrian Stage 4 is the still unnamed 4th stage of the Cambrian and the upper stage of the 2nd Cambrian series.
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In biology and ecology, extinction is the end of an organism or of a group of organisms (taxon), normally a species.
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Fossils (from Classical Latin fossilis; literally, "obtained by digging") are the preserved remains or traces of animals, plants, and other organisms from the remote past.
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In biology, a genus (plural: genera) is a taxonomic rank used in the biological classification of living and fossil organisms.
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The Peronopsidae (which may also be called peronopsids) comprise the earliest family of the Agnostina suborder.
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Trilobites (meaning "three lobes") are a fossil group of extinct marine arthropods that form the class Trilobita.
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Trilobites are used as index fossils to subdivide the Cambrian period.
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In biology, a type is one particular specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally attached.
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