Order Rodentia - Family Muridae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 1189 1531 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Zyzomys Thomas 1909 Zyzomys Thomas 1909 , Ann. Mag. Nat. Hist., ser. 8, 3: 372 . Type Species: Mus argurus Thomas 1889 Synonyms: Laomys Thomas 1909 . Species and subspecies: 5 species: Species Zyzomys argurus (Thomas 1889) Species Zyzomys maini Kitchener 1989 Species Zyzomys palatilis Kitchener 1989 Species Zyzomys pedunculatus (Waite 1896) Species Zyzomys woodwardi Thomas 1909 Discussion: Pseudomys Division. Member of the Australian Old Endemics ( Musser, 1981 c ) or Conilurini of Baverstock (1984) and Lee et al. (1981) , or Hydromyini of Baverstock and Watts (1994 a ) . Taxonomy of species appraised by Kitchener (1989) . Chromosomal morphology distinct from other Australian murines ( Baverstock et al., 1977 c ), but not allozymic data ( Baverstock et al., 1981 ), and G-banding homologies suggested karyotype of Zyzomys "to be derived from the ancestral karyotype characterizing Conilurus , Mesembriomys , and Leggadina " ( Baverstock et al., 1983 b ). Molar traits resemble those characterizing Conilurus ( Misonne, 1969 ) , but phallic characters link Zyzomys to Pseudomys and its close relatives ( Lidicker and Brylski, 1987 ). Albumin immunology indicates Zyzomys belongs in a clade with Mesembriomys , Conilurus , Leporillus , and Melomys ( Watts et al., 1992 ) , and Watts and Baverstock (1994 a , 1995 b , 1996) included it in their expanded version of Hydromyini (an "Australasian clade"), which incorporates the former Conilurini. External morphology of glans penis and spermatozoa reported by Breed (1984) , Breed and Sarafis (1978) , and Morrissey and Breed (1982) , and phylogenetic significance discussed by Breed (1997) . Mahoney and Richardson (1988) cataloged taxonomic, distributional, and biological references to some of the species. Zyzomys rackhami , the earliest record of the genus, comes from late Pliocene sediments (Aplin, 2004; Godthelp, 1997 ).