Final answer:
Barnacles do not possess a mineralized external shell, unlike typical crustaceans. They have a cuticle made of chitin, along with other common traits such as a free-swimming larval stage and a segmented body.
Explanation:
Mineralized external shell is NOT a typical trait of crustaceans that barnacles share. Unlike some other crustaceans, barnacles do not possess a mineralized external shell. Instead, they have acuticle made of chitin, which is a characteristic trait. Additionally, barnacles have a free-swimming larval stage and a segmented body like other crustaceans.
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