Lady, EVOLVED 
« I am skeptical about the assertion that this is "a letter of the Latin alphabet". Since when did Latin ever have pharyngeals? Or voiced fricatives for that matter? Unless I am very badly misinformed, someone must have added (or proposed adding) this letter at some later point in time for some purpose entirely unrelated to Latin. »
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wikipedia talk pages are FULL of pedants convinced that “the Latin alphabet” means not “the system of letters spread by the Romans and adopted widely across Europe and other regions” but, specifically, “the system of letters used to write the Latin language”
in fairness the reason we have to call it “Latin” is because “Roman” contrasts with “Italic”