Figure 4 in A standardized terminology of spines in the order Siluriformes (Actinopterygii: Ostariophysi)

Figure 4. Variation in dorsal- and pectoral-fin spine morphology in assorted Siluriformes. Dorsal-fin spine base in Pseudoplatystoma sp. (MZUSP 115260) in (A) anterior and (B) left views. Dorsal-fin spine in Synodontis schall (MZUSP 84468) in (C) left view, proximal to the left; left pectoral-fin spine in (D) anterior and (E) ventral views. Right pectoral-fin spine in Bagroides melapterus (MZUSP 41323) in (F) dorsal view. Scale equals 2 mm in all cases.