Los tardígrados popularmente llamados osos de agua forman un phylum de invertebrados microscópicos poco conocidos que se encuentran en hábitats de agua dulce, marinos y terrestres. Desde su descubrimiento han sido objeto de estudio por la criptobiosis. Esta adaptación fisiológica les da la capacidad de sobrevivir ante condiciones ambientales extremas. Globalmente la taxa de tardígrados asciende poco más de 1,200 especies, en México se cuenta con 56 especies registradas, su escasa abundancia es debida al poco conocimiento que se tienen sobre estos espectaculares organismos.
A total of 66 specimens representing four tardigrade taxa were found in 14 moss and lichen samples collected from the bark of Jeffrey’s Pine, Pinus jeffreyi Balf., in the Sierra de San Pedro Mártir (Baja California, north-western Mexico). Two taxa were identified to the species level (Echiniscus becki Schuster & Grigarick, 1966 and E. blumi Richters, 1903), and two to the genus level (Milnesium sp. and Ramazzottius sp.). These are the first tardigrade records from the state of Baja California, and they increase the known tardigrade diversity of Mexico to 84 species.
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