A member of the Pythonidae which is closely related to other Australian Diamond or Carpet pythons (Morelia), placed as a subspecies of Morelia spilota. The abundant and well known genus Morelia contains five species across Australia, but it is only this subspecies that occurs in the west.
It has a length up to 2.3 metres, 2.0 m from snout to vent. This species has a well defined neck and small scales across the head. Males may be up to 1.1 kg in weight, females may be four times larger when fully grown. Larger individuals have been given as 4 metres in length. Several other similar pythons occur in its range. The Woma, Aspidites ramsayi, lacks the obvious neck of M. spilota imbricata, and the Western Stimson's python, Antaresia stimsoni stimsoni, has more rows of scales at the underside.
The habitat is coastal areas, woodland, heathland, and semi arid. It is often found in woodlands of Eucalypt and Banksia, or amongst grasses or low growing shrubs. It is discrete and slow moving, spending most of its time hidden, though occasionally it is seen attempting to cross roads. Typically this python is sedentary, but females in a survey at Garden Island were noted to be active most of the year. M. spilota imbricata takes up residence in deep crevices or holes in limestone, on granite, in dense heath, and animal burrows. The diet of this subspecies is eat geckos, house mice, birds, and marsupials, including the Tammar wallaby.
Individuals may have a large range, occupying hollow logs in cooler months and wandering across areas up to 20 ha. Males tend to have a larger range. They appear to return to the same sites, even after long absences, which may contribute to a threat of extinction.