Omalonyx gayana should be Succinea gayana following SIMON TILLIER, SOUTH AMERICAN AND JUAN FERNANDEZ SUCCINEID SLUGS (PULMONATA), Journal of Molluscan Studies, Volume 47, Issue 2, August 1981, Pages 125–146, https://doi.org/10.1093/oxfordjournals.mollus.a065563
Omalonyx gayana should be Succinea gayana following SIMON TILLIER, SOUTH AMERICAN AND JUAN FERNANDEZ SUCCINEID SLUGS (PULMONATA), Journal of Molluscan Studies, Volume 47, Issue 2, August 1981, Pages 125–146, https://doi.org/10.1093/oxfordjournals.mollus.a065563
but for a reason I can not commit the change.