A new species of Depressizona and the family rank of Depressizonidae

The microscopic scissurellids are being currently revised; scissurellids is used here for the small Vetigastropoda formerly classified in Scissurelloidea, but which has been shown to be a polyphyletic assemblage (e.g., Geiger 2008, Geiger & Thacker 2005). Geiger (2003) presented an overview, where the new monotypic subfamily, genus, and species were introduced: Depressizoninae with Depressizona exorum Geiger, 2003. Here a second species in the genus is described, which also helps to justify the family-level rank of the group. Standard techniques for scanning electron microscopy were used (see Geiger et al. 2007). Abbreviations: AMS: Australian Museum Sydney, Australia. BMNH: The Natural History Museum, London, Great Britain. MNHN: Muséum national d’Histoire naturelle, Paris, France. NMNZ: Museum of New Zealand Te Papa Tongarewa, Wellington, New Zealand. USNM: United States National Museum, Smithsonian Institution, Washington (DC), USA.