Juga

This article is about a genus of snails. For the municipality in Finland, see Juuka.

Juga is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Semisulcospiridae.

Juga
Shells at the Naturalis Biodiversity Center
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Family:	Semisulcospiridae
Genus:	Juga H. Adams & A. Adams, 1854[1]

These snails are native to the rivers of the northwestern United States and adjacent British Columbia. Several species are endemic to isolated large springs in the American Great Basin.^[2]

The most abundant and widespread species, Juga plicifera, attains a height of up to 35 mm. It is sculpted with fine spiral ridges and variably developed ribs that frequently disappear in parts of the shell made as the animal matures.^{[citation needed]}

Species

The following species and subspecies are recognized:

Subgenus Juga s.s.

• Juga hemphilli (J. Henderson, 1935)^[3]
  • Juga hemphilli dallesensis (J. Henderson, 1935)^[3]
  • Juga hemphilli maupinensis (J. Henderson, 1935)^[4]
• Juga plicifera (I. Lea, 1838)^[3]
• Juga silicula (Gould, 1847)^[3]

Subgenus Calibasis

• Juga acutifilosa (Stearns, 1890)^[3]
  • Juga acutifilosa pittensis^[3]
  • Juga acutifilosa siskiyouensis^[3]
• Juga occata (Hinds, 1844)^[3]

Subgenus Oreobasis

• Juga bulbosa (Gould, 1847)^[3]
• Juga interioris (Goodrich, 1944)^[3]
• Juga laurae (Goodrich, 1944)^[3]
• Juga nigrina (I. Lea, 1856)^[3]

subgenus ?

• Juga chacei (Henderson, 1935)^[4]
• Juga newberryi (I. Lea, 1860)^[4]
• Juga orickensis (Henderson, 1935)^[4]

Ecology

Parasites of Juga spp. include the bacterium Neorickettsia risticii, which causes Potomac horse fever along with the associated trematode vector.^[5] Juga species are also infected with the bacterium Neorickettsia helminthoeca and its associated fluke, Nanophyetus salmincola^[6]