Phylum Mollusca Linnaeus, 1758 - molluscs
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Divasibranchia Minichev & Starobogatov, 1975
Order Stylommatophora Schmidt, 1855
see Infraorder Stylommatophora Schmidt, 1855
(Achatinid Sigmurethra)
Suborder Sigmurethra Pilsbry, 1900
see Group Sigmurethra Pilsbry, 1900
Superfamily Orthalicoidea Martens, 1860
Family Urocoptidae Pilsbry, 1898 (1868), nom. inq.
Subfamily Holospirinae Pilsbry, 1946
Genus Metastoma Strebel & Pfeffer, 1880