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Temporal range: Late Carboniferous[1]
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Myriapoda
Class: Diplopoda
(unranked): Juliformia
Superfamily: Xyloiuloidea
Family: Xyloiulidae
Cook, 1895
Genus: Xyloiulus
Cook, 1895
Type species
Xyloiulus sigillariae
(Dawson), 1860

X. bairdi Hoffman, 1963
X. frustulentis Scudder, 1890
X. mazonus Scudder, 1890
X. pstrossi Fritsch
X. sigillariae (Dawson), 1860
X. sellatus Fritsch



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.[3]


  1. ^ Hoffman, R.L. (1963). "New genera and species of Upper Paleozoic Diplopoda". Journal of Paleontology 37 (1): 167–174. 
  2. ^ Palmer, Douglas; et al. (2009). Prehistoric Life: The Definitive Visual History of Life on Earth (first American ed.). New York City: DK Publishing. p. 161. ISBN 9780756655730. 
  3. ^ Annals of the New York Academy of Sciences. New York Academy of Sciences. 1897-01-01. p. 3. 

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