FIGURE 1. Geological map of the Huehuetla quarry, Puebla, Mexico. In this work this map includes the surrounding area of this quarry as a Turonian outcrop deposit belonging to the Agua Nueva Formation (modified from Servicio Geológico Mexicano, 2004).
FIGURE 3. Specimens of the family Clupeidae recovered in the Huehuetla quarry, Puebla, Mexico. 1, IGM 6626; 2, IGM 7781. Abbreviations: absc, abdominal scute; pcl, postcleithrum; pdsc, predorsal scute; rec, recessus lateralis.
FIGURE 4. IGM 8990, Goulmimichthys roberti from the Huehuetla quarry, Puebla, Mexico. 1, complete specimen; 2, closeup of the pelvic fin coated with ammonium citrate. Abbreviations: af, anal fin; ap, anterior process of the pelvic bone; df, dorsal fin; lp, lateral process of the pelvic bone; pb, pelvic bone; pvf, pelvic fin; pvfr, pelvic fin ray.
FIGURE 5. Hastichthys sp. from the Huehuetla quarry, Puebla, Mexico. 1, IGM 7969, a complete specimen; 2, IGM 7970, a specimen showing bones of the head and some vertebrae; 3, closeup of the lower jaw (= square in 2); 4, closeup of the caudal fin (= square in 1). Abbreviations: den, dentary; df, dorsal fin; h, hypural; pmx, premaxilla; the arrows in 3 show the longitudinal ridges in dentary bone that are like those observed in the premaxilla.
FIGURE 6. IGM 8991, Enchodus sp. from the Huehuetla quarry. Abbreviations: adt, anterior dentary tooth; art, articular, br, branchiostegal ray; cha, anterior ceratohyal; den, dentary; dp, dentary prongs; ect, ectopterygoid; pap, parasphenoid; pmx, premaxilla; op, opercle; pop, preopercle; slro, strengthened longitudinal ridge of the opercle (=longitudinal straight bar of the opercle); sop, subopercle.
FIGURE 7. IGM 9524, Tselfatia formosa from the Huehuetla quarry, Puebla, Mexico. 1, complete specimen coated with ammonium citrate; 2, closeup of fulcra in the longest anal fin ray indicated by black arrows (= square in 1).