Xyloiulus bairdi Hoffman, 1963 Xyloiulus frustulentis Scudder, 1890 Xyloiulus mazonus Scudder, 1890 Xyloiulus pstrossi Fritsch Xyloiulus sigillariae (Dawson), 1860 Xyloiulus sellatus Fritsch Xylobius Xyloiulus is an extinct genus of millipede that lived during the Late Carboniferous which grew up to 2.25 inches (5.7 cm) in length.

Fossils of the animal have been found in North America and Europe.

[2] The fossils are typically found in Sigillarian stumps.

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