Opacuincola cervicesmadentes is a critically endangered species of fresh water snail native to New Zealand.
Opacuincola cervicesmadentes Wikipedia
This snail has been found in only one location at the Charing Cross entrance of Wet Neck Cave, west of Mangarakau and Collingwood. The population trend of this snail is unknown at present but it is regarded as potentially threatened by habitat destruction, agricultural work and caving pursuits.
In 2013 the Department of Conservation classified Opacuincola cervicesmadentes as Nationally Critical under the New Zealand Threat Classification System. The species was judged as meeting the criteria for Nationally Critical threat status as a result of it occupying a total area of less than 1 hectare. It is found only in one location and is also classified as Data Poor under that system.