Spread of O. moreleti by international trade may be facilitated by its ability to survive long sea voyages in a quiescent state.

In their sexual form, they have gonopods (mating legs) in the seventh body segment, which they lose when they moult in spring.

[7][8] The main period of O. moreleti activity follows the breaking of summer drought by autumnal rains and cooling temperatures.

In the southern Iberian Peninsula, a number of species of the genus Ommatoiulus share a similar range but divide their habitat on type of litter.

[11] As an invading species in the southern Australian detritivore community, O. moreleti does not appear to have negatively affected native millipedes sharing a similar range, and seems to have occupied vacant niches.

[12][13] Gut contents of mature O. moreleti collected in Portugal were predominantly fragments of Quercus and Pinus litter.

Natural enemies in Portugal include the European hedgehog (Erinaceus europaeus) and the beetle Ocypus olens, both of which are generalist predators.

[17] This decline has been associated with parasitism by the nematode Rhabditis necromena [18] that appears to have spread from native millipede populations.

In urban areas of southern Australia, O. moreleti enter dwellings during their autumn and spring activity periods.

[citation needed] As a defense mechanism, the millipede secretes a pungent yellowish fluid containing quinones.

[citation needed] O. moreleti, alone of the millipede species in this environment, is attracted to low intensity light, of the type emitted from houses at night.

[citation needed] Crushed millipedes may have caused a 2013 minor train crash in Clarkson, Western Australia.