Vachonisia is a Devonian marrellomorph known from the Lower Devonian Hunsrück Slate.

[1] It grows in a similar fashion to the other Hunsruck marrellomorph, Mimetaster,[2] and is closely related to the Silurian Xylokorys.

[3] It is known from 20 specimens; its whole body is covered by a shield-like carapace.

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