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These methods were used with a large sample of 671 children ages 6\u20138 who were diagnosed with severe reading disorders. Latent characteristics of the sample are assessed in regard to posited subtypes with phonological deficits and naming speed deficits, thus extending prior work by addressing whether these deficits embody separate classes of individuals. Findings support separate taxa of dyslexia with and without phonological deficits. Different latent structure for naming speed deficits was found depending on the definitional criterion used to define dyslexia. Non\u2010phonologically based forms of dyslexia showed particular difficulty with naming speed and reading fluency. 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