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Xenusiid
Class Xenusia, the Xenusiids, represents the subset of lobopodian worms that fall in the stem-lineage of Onychophora.〔 Their type genus is ''Xenusion''. They have relatively large, annulated, cylindrical body. Their lobopod legs have tubercles at their bases. Some have large frontal appendages,〔 although these may represent taphonomic artefacts. Their mouth is terminal or subterminal, and they are marine. They probably represent a grade (paraphyletic group) rather than a clade (monophyletic group).
==Systematics==
Xenusia includes the following orders and families:〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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