Simalia amethistina

Specimens of S. amethistina have reportedly been measured at more than 5.5 m (18.0 ft) in total length (including tail), but this is likely due to confusion with Australian S. kinghorni specimens, as even 4 m (13 ft) specimens of S. amethistina are already considered extremely large. Although the amethystine python is smaller than the Australian scrub python, some sources claim that S. amethistina is able to reach lengths of 6 m (20 ft), with a weight up to 27 kg (60 lb). The smooth dorsal scales are arranged in 39–53 rows at midbody. There are deep, heat-sensing pits on six or seven of the posterior lower labials.

The Amethystine python is found in Indonesia (Maluku Islands, Timur Laut Islands, Banda, Kai Islands, Aru Islands, Misool, Salawati, most of Western New Guinea, many islands in Geelvink Bay, such as Biak, Numfor, Yapen, and Supiori), and Papua New Guinea (including Umboi Island, Bismarck Archipelago, Trobriand Islands, the d'Entrecasteaux Islands to Rossel Island, Louisiade Archipelago). The type locality is unknown. S. amethistina occurs in both bushland and suburbia. In Indonesia, it is found mostly in rainforests. Warm, humid habitats with good water sources are preferred. In New Guinea, it mostly lives in scrublands.

The diet of the amethystine python generally consists of birds, bats, rats, possums, and other small mammals. Larger Papuan specimens catch and eat wallabies and cuscus, waiting by creek and river banks for prey seeking drinking water.