''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were described in 2012, and those just from Spain.Akkari, N. and H. Enghoff. (2012)
Review of the genus ''Ommatoiulus'' in Andalusia, Spain (Diplopoda: Julida) with description of ten new species and notes on a remarkable gonopod structure, the fovea.
''Zootaxa'' 3538 1-58. Six new species were described from Portugal in 2017. There are many millipedes known to belong to this genus that do not yet have official names.Bailey, P. T. and T. R. de Mendonça. (1990)
The distribution of the millipede ''Ommatoiulus moreleti'' (Diplopoda, Julida: Julidae) in relation to other ''Ommatoiulus'' species on the south-western Iberian Peninsula.
''Journal of Zoology'' 221(1) 99–111. Ommatoiulus sabulosus 2

This genus is distinguished by the position of the ozopores, the shape of the ocelli and the gonopod legs, the presence of accessory claws on the juveniles, and the presence in males of a large fovea, a cavity where

sperm Sperm is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one). Animals produce motile sperm with a tail known as a flagellum, whi ...

are stored. Familiar species include the

black Portuguese millipede ''Ommatoiulus moreleti'' (spelt ''moreletii'' in older publications), commonly known as the Portuguese millipede, is a herbivorous millipede native to the western Iberian Peninsula where it shares its range with other ''Ommatoiulus'' species. F ...

(''Ommatoiulus moreletii''). It is an invasive species in Australia known for its "plagues", when it emerges in swarms so massive that they stop trains, which crush them in huge numbers and make the rails slippery. Like some other millipedes, it produces a secretion with an obnoxious odor and tendency to stain floors when the swarms invade houses.Yuncken, L
Millipede madness.
ABC Science. April 5, 2007. Another well-known species is the striped millipede (''O. sabulosus''), which also swarms. In 2002 it flooded the streets of Dąbrowa Górnicza in Poland, "causing panic among the inhabitants". Swarms in France have consisted of "thousands of millions" of individuals, far too many to count. This species has also been known to stop trains. VERHOEFF K. W. (1900)
Wandernde Doppelfüßler, Eisenbahnzüge hemmend
in Zool. Anz., 23, p. 465—473. Species include:
Systema Naturae 2000. *''

Ommatoiulus alacygni ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus andalusius ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus aurozonatus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus avatar ''Ommatoiulus avatar'' is a species of European millipede in the family Julidae. Individuals are known from Andalusia, southern Spain. Individuals are long. Color in alcohol preserved specimens is brownish with yellowish and black marbling on t ...

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Ommatoiulus baenai ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus baileyi ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus bipartitus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus camurus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus caspius ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus cingulatus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus denticulatus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

'' *'' Ommatoiulus diplurus'' *'' Ommatoiulus dorsovittatus'' *''

Ommatoiulus fuentei ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus fuscounilineatus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus hoffmani ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus ibericus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus ilicis ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus inconspicuus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

'' *'' Ommatoiulus jaenensis'' *'' Ommatoiulus kessleri'' *'' Ommatoiulus kimei'' *'' Ommatoiulus lapidarius'' *'' Ommatoiulus litoralis'' *''

Ommatoiulus lusitanus ''Ommatoiulus lusitanus'' is a species of millipede endemic to Portugal. It predominantly inhabits grassland but also occurs in ''Cistus ''Cistus'' (from the Greek ''kistos'') is a genus of flowering plants in the rockrose family Cistaceae, co ...

'' *'' Ommatoiulus martensi'' *''

Ommatoiulus moreletii ''Ommatoiulus moreleti'' (spelt ''moreletii'' in older publications), commonly known as the Portuguese millipede, is a herbivorous millipede native to the western Iberian Peninsula where it shares its range with other ''Ommatoiulus'' species. Fro ...

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Ommatoiulus navasi ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus niger ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus oliveirae ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus oxypygus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus paralellus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus porathi ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus pseudoflagellatus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus punicus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus recueroi ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus reipi ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

'' *'' Ommatoiulus rutilans'' *''

Ommatoiulus sabinarensis ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus sabulosus ''Ommatoiulus sabulosus'', also known as the striped millipede, is a European millipede of the family Julidae. Its common name comes from its two striking bright longitudinal bands on the dorsal surface. ''O. sabulosus'' is widespread and commo ...

'' *'' Ommatoiulus schubarti'' *''

Ommatoiulus staglae ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus stellaris ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus tetuanus ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

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Ommatoiulus vilnensis ''Ommatoiulus'' is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were ...

References

{{Taxonbar, from=Q4298887 Julida