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Hypostome of Arthroaspis bergstroemi n. gen. n. sp. A. MGUH 30413, impression of hypostome under cephalon, with box-like wrinkling at the anterior margin (dorsal aspect); B. MGUH 30416 outline of hypostome with impression of anterior wing and box-like wrinkling of the cephalic shield above (ventral aspect); C. MGUH 30387, outline of hypostome with impression of posterior wing (ventral aspect).
