FIGURE 3. Non-teleostean fishes from Sierra Madre Formation. 1, Silicone peel of FCMP 00/497, a pycnodontid fish from El Espinal quarry. 2, Close-up of the head of FCMP 00/497. 3, IHNFG 2981, Macrosemiocotzus sp. from El Espinal quarry. Abbreviations: bf, basal fulcra; bsc 1-2, bar-like scales (rows 1-2). clo, cloaca; df, dermocraneal fenestra; dpt, dorsal pterygiophore; drs 1-13, dorsal ridge scales; dsoc, dermal supraoccipital; dt, dentary teeth; fr, frontal; pa, parietal; pmxt, premaxilla teeth; io 7, infraorbital seven; iop, interopercle; pp, parietal process; pvf, pelvic fin; wsc 1-3, wide scales (rows 1-3); arrows in 3 show the different length of the dorsal rays. Scale bars equal 25 mm.