Abstract:
57 species and infraspecific taxa belong to 17 genus of diatoms from a creek in Texcala, near Tehuacan City, Puebla, Mexico are registered. Six taxa not reported before from Mexico are illustrated and described with notes of some ecological characteristics and their geographical distribution. The new records are: Cocconeis scutellum var. parva (Grunow) Cleve, Cymbella turgidula Grunow, Navicula recens Lange Bertalot, Pleurosigma salinarum (Grunow), Nitzschia calida Grunow, Nitzschia constricta (Kutzing) Ralfs.