This paper traces phonological developments and clarifies internal relationships in the Delta-California subgroup of the Yuman language family. It demonstrates that Delta-California Yuman comprises three subdivisions and at least eight languages, proposes a reorganization of the Yuman family tree that gives equal weight to the Delta-California and Pai-River subgroups, and concludes that the Yuman family is much older and deeper than has previously been believed. It points out that long-neglected languages of the Delta-California subgroup urgently need recognition and documentation.

中文翻译：

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Delta-California Yuman的语音发展

本文追溯了尤曼语系的三角洲-加利福尼亚亚群的语音发展并阐明了内部关系。它表明三角洲-加利福尼亚玉曼语包含三个分支和至少八种语言，提议重组玉曼族谱，赋予三角洲-加利福尼亚和派河亚群同等的权重，并得出结论，玉曼语族更古老、更深入比以前认为的要好。它指出，Delta-California 亚群长期被忽视的语言迫切需要得到认可和记录。