updated 10/16/2009 7:03:35 PM ET 2009-10-16T23:03:35

A judge has dismissed a request to throw out the most serious criminal charges against a Florida mother accused of killing her 2-year-old daughter.

Circuit Judge Stan Strickled ruled Friday that a motion filed by Casey Anthony's attorneys did not meet the requirements needed for a dismissal of the first-degree murder and aggravated child abuse charges.

In an earlier filing, Anthony's attorneys had said the charges were based on "circumstantial and speculative" evidence.

During a brief hearing Friday, prosecutor Linda Drane Burdick said the defense attorneys' motion was insufficient and riddled with errors.

Anthony has pleaded not guilty and says a baby sitter kidnapped Caylee. The toddler's remains were found in December 2008, months after she was reported missing.

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