The Navugabo Groundsel was described in 1986, the species is known only from the type specimen that was collected in 1935 (according the the IUCN) or 1947 from a swampy area at Lake Navugabo in the Masaka District, southwestern Uganda.
The species was never recorded again despite it originating from a otherwise fairly-well collected area.
Concave Lake Victoria Snail (Ceratophallus concavus)
The Concave Lake Victoria Snail was endemic to Lake Victoria and was apparently restricted there to a place named Hippo Bay near the city of Entebbe, Uganda; it inhabited shallow water, where it was found under stones, a habitat that it shared with other water snail species.
The shells reached sizes of about 0,12 x 0,32 cm; they are said to be reddish-brown and rather glossy. 
 Danish Bilharziasis Laboratory: A field guide to African freshwater snails. 2. East African species. 2nd edition. Danish Bilharziasis Laboratory, Charlottenlund. 1-51. 1987