Bolaspis vs Agnostus
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Bolaspis
Bolaspis is an extinct genus of Middle Cambrian trilobites in the family Bolaspididae. It is known from western North American formations, including the Wolsey Shale of Montana and the Marjum Formation, and its species have been included in studies of Cambrian trilobite faunas. The genus is represented by small fossil specimens, and its named species are compared using preserved details of the hea...
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Agnostus
Agnostus is a genus of small Cambrian agnostid trilobites. Members typically had a compact body with head and tail shields that were similar in size and outline, and many species were blind or had highly reduced eyes. Agnostus fossils occur in Cambrian marine rocks on several continents, and some species are important biostratigraphic index fossils because their ranges can help correlate rock laye...
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