File:Arthrorhachis tarda half photo half draw.jpg

left: own work (drawing of the right); right: half of a photo in Per Ahlberg (1989). "Agnostid trilobites from the Upper Ordovician of Sweden and Bornholm, Denmark". Bulletin of the Geological Society of Denmark 37:213-226. p. 215. uploader considers this a De minimis copyright infringement for the right half of the image: it is a picture taken at a right angle that would only marginally differ from other pictures taken at the same angle.

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