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Pentecopterus decorahensis, SUI 139941 (holotype) - rostrum and linguoid posterior projection underlain by left and right prosomal appendages II and III. a Specimen. b Interpretive drawing: red = ventral plate, green = appendage II, and blue = appendage III, II-2–II-4 = appendage II podomeres 2–4, III-2 = appendage III podomere 2. The coxa are angled anteriorly and covered by the ventral plate, which can be peeled back to reveal their position. Scale bar = 10 mm
