FIGURE 2 in Spinipterus, a new genus of small, spiny catfish (Siluriformes: Auchenipteridae) from the Peruvian Amazon

FIGURE 2. Pectoral-fin spine of Spinipterus acsi. A. Anterior view. B. Schematic illustration of cross section of spine. 1. Anterior row of serrations. 2. Posterior row of serrations. 3. Anterodorsal row of serrations. 4. Anteroventral row of serrations.