FIGURE 4. Teleostean fishes from Sierra Madre Formation. 1 and 2, IHNFG 2985, an ichthyodectiform fish from El Chango quarry, complete specimen and close-up of the head. 3-6, INAH 1941, Triplomystus applegatei from El Espinal quarry, complete specimen and details, close-up of the postdorsal scute series (4), close-up of the predorsal scute series (5), and close-up of the ventral scute series (6). 7 and 8, part and counterpart of IHNFG 2984, Paraclupea-like, from el Espinal quarry. Abbreviations: 131°, angle of paraesphenoid; bsc, basal sclerotic bone; etpa, ethmopalatine; mx, maxilla; pal, palatine; pmx, premaxilla; sc, sclerotic; spos, scutes of the postdorsal series; soc, supraoccipital; sprs, scutes of predorsal series; svs, scutes of ventral series. Scale bars equal 50 mm.