English: A drawing of Arthrorhachis tarda, order Agnostida, family Metagnostidae, based on photographs in Per Ahlberg (1989). "Agnostid trilobites from the Upper Ordovician of Sweden and Bornholm, Denmark". Bulletin of the Geological Society of Denmark37:213-226, most notably figure 2c: internal mould of a nearly complete specimen from Bestorp, Mosseberg, Vastergotland. Upper Jonstorp Formation. Coll. excursion 1980. LO 5923t. x7.1.
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