Radix is a genus of air-breathing freshwater snails, aquatic pulmonate gastropods in the family Lymnaeidae, the pond snails. The genus Radix has a Palaearctic distribution. Phylogeny Correa et al. (2010) confirmed that the placement of these species within the genus Radix reflected their phylogenetic relationship. A cladogram showing phylogenic relations of species in the genus Radix: The haploid number of chromosomes of all species in the genus Radix is 17 (n=17). Species The taxonomic status of certain species in the genus Radix has been disputed. Remigio (2002) reported sequence divergence within the 16S mitochondrial gene of Radix peregra and Radix ovata. Furthermore, the shell morphology and alloenzyme data indicated that Radix peregra and Radix ovata are distinct. In contrast, Bargues et al. (2001) considered, on the basis of ITS-2 sequence analysis, that R. peregra, R. ovata, and R. balthica are in fact conspecific. † Radix (Lytostoma) grammica (Brusina, 1872) Radix acuminata (Lamarck, 1822) † Radix alta Macaleț, 2000 † Radix alutae (Jekelius, 1932) † Radix amaradica Macaleț, 2000 Radix ampla (Hartmann, 1821) Radix andersoniana (Nevill, 1881) Radix auricularia (Linnaeus, 1758) - type species Radix auricularia japonica Jay, 1857 - at Japanese Wikipedia Radix bactriana (Annandale & Prashad, 1919) † Radix balatonica (Fuchs, 1870) Radix balthica (Linnaeus, 1758) † Radix berbestiensis Macaleț, 2000 † Radix bogdanensis Macaleț, 2000 Radix brevicauda (G. B. Sowerby II, 1872) † Radix calavardensis (Bukowski, 1896) † Radix croatica (Gorjanović-Kramberger, 1890) † Radix cucuronensis (Fontannes, 1878) † Radix dilatata (Noulet, 1854) † Radix dilleri (Neumayr, 1883) † Radix enzenbachensis Neubauer & Harzhauser in Harzhauser et al., 2014 † Radix extensa (Gorjanović-Kramberger, 1890) Radix gebleri (Middendorff, 1851) Radix gedrosiana (Annandale & Prashad, 1919) Radix hordeum (Mousson, 1874) Radix hubrechti Qian, Yang & He, 2012 † Radix impressa (Sinzov, 1875) Radix iranica (Annandale & Prashad, 1919) † Radix jaksici (Brusina, 1902) Radix jordii Altaba, 2007 Radix kamtschatica (Middendorff, 1851) † Radix kobelti (Brusina, 1884) † Radix korlevici (Brusina, 1884) † Radix kurelaci (Brusina, 1902) Radix labiata (Rossmässler, 1835) † Radix laevigata (Eichwald, 1853) Radix lagotis (Schrank, 1803) † Radix lazarevici (Brusina, 1902) Radix lilli Glöer & Beckmann, 2007 Radix linae Altaba, 2007 Radix luteola (Lamarck, 1822) † Radix lytostomopsis (Brusina, 1902) † Radix macaleti Neubauer, Harzhauser, Kroh, Georgopoulou & Mandic, 2014 † Radix marinescui Macaleț, 2000 † Radix minutissima (Greppin, 1855) Radix namucuoensis Qian, Yang & He, 2012 Radix natalensis (Krauss, 1848) † Radix navarroi (Royo Gómez, 1922) †