Figure 2. Ischnacanthiform acanthodian dermal elements. A in Acanthodian fauna from the Early Devonian (Emsian) of Death Valley, California

Figure 2. Ischnacanthiform acanthodian dermal elements. A, fin spine FMNH-PF14560; B, fin spine fragment FMNH-PF14561. C, D, dentigerous jaw bone FMNH-PF14562, labial view; boxed area in C is enlarged in D. Scale bars=0.5 mm in A–C, 0.1 mm in D. Arrow indicates rostral direction.