Assertion: arthropod | /r/CapableOf | belong in monophyletic group
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text: Because the secondary antennae are not present in stem group arthropods such as Fuxianhuia, nor in the extant chelicerates, they propose that arthropods, such as the trilobites, that possess secondary antennae, belong in a monophyletic group that also includes the mandibulates, called the Antennata.