Two distinct subspecies of Poecilia mexicana occur in the northeastern and east-central Gulf coastal drainages of MÃ©xico. P. m. limantouri, the northern subspecies, ranges from the RÃo Grande drainage in Nuevo LeÃ³n south to the lower RÃo TamesÃ near Tampico. It is a slender, terete form with a short dorsal fin and narrow caudal fin. P. m. mexicana occurs along the Gulf coast from the RÃo Cazones drainage at least to the greater RÃo Jamapa system south of Veracruz City. It is a deep, somewhat compressed form with a long dorsal fin and broad caudal fin. A zone of intergradation extends coastwise from the lower RÃo Soto la Marina of Tamaulipas to the RÃo Tuxpan of northern Veracruz and inland along the southern drainage basin of the RÃo PÃ¡nuco.
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