Ferrissia

Not to be confused with the mealybug genus Ferrisia.

Ferrissia is a genus of small, air-breathing freshwater limpets, aquatic gastropod mollusks in the family Planorbidae, the ram's horn snails and their allies.

Ferrissia
Shell of Ferissia clessiana
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superorder:	Hygrophila
Family:	Planorbidae
Subfamily:	Ancylinae
Tribe:	Ancylini
Genus:	Ferrissia Walker, 1903[1]
Type species
Ancylus rivularis Say, 1817
Synonyms
Ferrissia (Kincaidilla) Hannibal, 1912 · accepted, alternate representation Ferrissia (Pettancylus) Iredale, 1943 · accepted, alternate representation

Species

Species within the genus Ferrissia include:

• Ferrissia baconi (Bourguignat, 1853)^[2]
• Ferrissia beaui (Bourguignat, 1853) - Beau's Stream Limpet^[3]
• Ferrissia burnupi (Walker, 1912)^[4]
• Ferrissia cawstoni Walker, 1924
• Ferrissia ceylanica Benson, 1864
• Ferrissia chudeaui Germain, 1917
• Ferrissia clifdeni Connolly, 1939
• Ferrissia connollyi (Walker, 1912)
• † Ferrissia crenellata Harzhauser & Neubauer in Harzhauser et al., 2012
• † Ferrissia deperdita (Desmarest, 1814)
• † Ferrissia dimici (Brusina, 1902)
• Ferrissia dohrnianus (Clessin, 1882)
• Ferrissia eburnensis Binder, 1957
• Ferrissia farquhari (Walker, 1924)
• Ferrissia fontinalis (Walker, 1912)
• Ferrissia fragilis (Tryon, 1863) - synonyms: Ferrissia clessiniana (Jickeli, 1882), Ferrissia wautieri (Mirolli, 1960) - Fragile Ancylid^[5]
• Ferrissia gentilis Lanzer, 1991^[6]
• † Ferrissia illyrica (Neumayr, 1880)
• Ferrissia irrorata (Guilding, 1828)
• Ferrissia isseli (Bourguignat, 1866)^{[citation needed]}
• Ferrissia junodi Connolly, 1925
• Ferrissia kavirondica (Mandahl-Barth, 1954)
• Ferrissia lacustris Walker, 1924
• Ferrissia leonensis Connolly, 1928
• Ferrissia lhotelleriei Walker, 1914 - dubious species^[7]
• Ferrissia mcneili Walker, 1925 - hood ancylid^[8]
• Ferrissia modesta Crosse, 1880
• Ferrissia natalensis Walker, 1924
• Ferrissia neozelanica (Suter, 1905)
• † Ferrissia neumayri (Fontannes, 1881)
• Ferrissia pallaryi Walker, 1914 - dubious species^[9]
• Ferrissia parallela (Haldeman) - oblong ancylid^[10] or Ferrissia parallelus^[11]
• Ferrissia petterdi (Johnston, 1879)
• † Ferrissia pontileviensis (Morgan, 1920)
• Ferrissia siamensis Brandt, 1974
• Ferrissia rivularis (Say, 1817) - the type species
• Ferrissia tasmanica (Woods, 1876)
• Ferrissia tanganyicensis (Smith, 1906)^[12]
• Ferrissia tenuis (Bourguignat, 1862)
• Ferrissia toroensis (Mandahl-Barth, 1954)
• † Ferrissia truci Wautier, 1975
• Ferrissia verruca (Benson, 1855)
• Ferrissia victoriensis (Walker, 1912)
• Ferrissia viola (Annandale & Prashad, 1921)
• Ferrissia walkeri (Pilsbry & Ferriss, 1907)
• † Ferrissia wittmanni (Schlickum, 1964)
• Ferrissia zambesiensis (Walker, 1912)
• Ferrissia zambiensis Mandahl-Barth, 1968

Many specific names need revision, for example 11 species of Ferrissia in southern Africa.^[13]

Species brought into synonymy

• † Ferrissia senckenbergiana (Boettger, 1877): synonym of † Ferrissia deperdita (Desmarest, 1814)
• Ferrissia wautieri (Mirolli, 1960): synonym of Ferrissia fragilis (Tryon, 1836)
• Ferrissia (Pettancylus) clessiniana (Jickeli, 1882): synonym of Pettancylus clessiniana (Jickeli, 1882)