On the anatomy and systematics o{ ]uga from western North America ...

This analysis confirms that Juga shares many anatomical features with other North American and Asian pleurocerids, but is clearly set apart from eastern North American pleurocerids in features of the ovipositor pore, radula, midgut, kidney, and pallial gonoduct. Juga is distinct from all other limnic cerithio-ideans known thus far in the form of the midgut crescentic ridge, the configuration of prostate glands, and an evagination of the kidney wall separating the main chamber and bladder. Based on information currently available, unlike molecular data, there is no morphological feature unambiguously linking Juga to Asian pleurocerids. Anatomically, Oreobasis is strikingly similar to Juga sensu stricto and is synonymized wdth it, whereas Calibasis is retained as a 'alid taxon'.