This paper presents a partial reconstruction of the inventory of phonological segments of Proto-Deltacalifornian, i.e., the hypothetical common ancestor of the languages of the Delta-California branch of the Yuman family. It is concerned with the consonantal segments of the protolanguage, based on a revised version of the comparative method. In addition to formulating a protosystem of consonants, the comparison between three languages of this Yuman sub-group suggests the necessity to reconsider the kind and degree of relationship among their members.Keywords: Yuman, Diegueño, Cocopa, Comparative MethodEste trabajo presenta una reconstrucción parcial del inventario de segmentos fonológicos del protodeltacaliforniano, es decir, la lengua hipotética que dio origen a las lenguas de la rama Delta-California de la familia lingüística yumana. Se aborda el inventario de segmentos consonánticos de la protolengua de * Agradezco los comentarios de Esther Herrera y de dos dictaminadores anónimos para la realización de este trabajo.