Xeromys myoides
Xeromys myoides, also known as the water mouse, marine mouse, mangrove mouse, false water rat, manngay and yirrkoo, is a species of rodent native to waterways of Australia and Papua New Guinea.
Taxonomy
A description of the species was published by Oldfield Thomas in 1889, establishing a new genus Xeromys; recognition as a monotypic genus has been maintained by later authorities. Thomas recognised an affinity with the species Hydromys chrysogaster, the water-rat found in Australia and New Guinea.A current name used to refer to the species is water mouse. A common name of this species has long been false water-rat, although other names predate these. In 1995 the Australian Nature Conservation Agency released a document in which were recorded two indigenous names for H. chrysogaster, the Murrinh-Patha name manngay and the Mayali and Kunwinjku name yirrku. They recommended that the latter name be adopted as the common name, but with the orthography yirrkoo. However, this recommendation was not prescriptive, and it remains to be seen to what extent it will be adopted.
Description
False water rats have markedly long, flattened heads with small eyes and short, rounded ears that are 10 to 14 millimetres in length. These rats possess just two molars on each side of the upper and lower jaw. Their upper incisors are yellow or orange and the lower incisors are white. The head and body length is approximately 100 mm and characterised by a hunched body shape, the recorded size range is from 85 to 120 mm. The tail length is 85–100 mm and the hind-foot length is 23–26 mm. The body fur is water-resistant and dark gray, which gradually blends into the white underside, the hair is short and lustrous. The hands and feet are covered with fine, white hairs. Their feet are not webbed like other water rats, which gives them their common name "false" water rat. The tail is sparsely haired and lacks the white tip found in the more common water rat. In addition, the tails of these rats are scaled. The average weight is 42 grams, and may vary from 35 to 55 g. This murid species has a total of four teats, two pairs at the inguinal region. They exude a strong musky odour.X. myoides resembles no other species found within its habitat.
Distribution and habitat
The false water rat lives in Australia and Papua New Guinea. Once believed to be restricted to Southeast Queensland and the Northern Territory, the false water rat has subsequently been found in the central and southern parts of Queensland, North Stradbroke Island off the coast of Southeast Queensland, Melville Island, and southwest Western Province, Papua New Guinea.False water rats primarily live in mangrove communities and shallow areas surrounding lagoons, swamps, and lakes. The water may be saline or fresh. Their nests are made at the base of mangrove trees. Their nests are very similar to termite mounds. They are made of leaves, mud, and may be as high as 60 centimetres. There is usually one opening and on the inside it is a complex system of tunnels which connects to multiple chambers. Since the tunnels are very complex sometimes the homes can overlap. This behaviour shows that they are social and very friendly. Because of their lack of webbed feet and their inability to swim, their nests are generally built near shallow water. This allows them to wade in water instead of swimming and diving in search of their food.