Nektaspida
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Nektaspida is an extinct order of non-mineralised artiopodan arthropods. They are known from the lower-Cambrian to the upper Silurian. Originally classified as trilobites, which they superficially res
Naraoia compacta fossil
Digestive systems of various naraoiid species
Drawing of the carapace of the incertae sedis nektaspid Buenaspis
Restoration of the emucaridids Kangacaris (blue, left) and Emucaris (yellow, right)
Emucarididae
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Emucarididae is an extinct family of soft-shelled trilobite-like arthropods from the Lower Cambrian of South Australia and South China and from the Upper Ordovician of Morocco. It contains only three
Nektaspida
…resemble, they are now placed as close relatives as members of the Trilobitomorpha within Artiopoda. The order is divided into three major families; Emucarididae, Liwiidae, and Naraoiidae. The order was originally proposed by Raymond in 1920 as Nektaspia. Størmer corrected it to Nectaspida for the 1959 Treatise…
Retifacies