Black Portuguese millipede

Description:

Adult black Portuguese millipedes are smooth, 20–45 millimetres (0.8–1.8 in) long and coloured from grey to black. Immature specimens are striped and light brown. O. moreletii hatches from eggs in the soil and reaches maturity in two years.[2] Adult males are periodomorphic, alternating between a sexual and a non-sexual form. In their sexual form, they have gonopods (mating legs) in the seventh body segment, which they lose when they moult in spring. They remain in the non-sexual "eunuch" form until their late summer moult

Habitat:

Ommatoiulus moreletii, commonly known as the black Portuguese millipede, is a herbivorous millipede native to Portugal. This species was accidentally introduced into Australia where it has since become an invasive pest. Since being introduced to Port Lincoln, South Australia in 1953, the millipede has spread to other parts of South Australia Victoria Tasmania Australian Capital Territory southern New South Wales Western Australia around Perth

Notes:

Lacking natural predators in Australia, O. moreletii has flourished to "plague" proportions. They are most often seen in moist conditions, which create an abundance of food. They have been known to enter residences due to their sheer numbers.[4] The millipedes were crushed in great numbers crossing the railway tracks at Tallarook, central Victoria in March 2009, causing train cancellations due to the disturbance of signalling equipment. spotted in my backyard,last 2 photos show the exact place ,a wood log