| Africatenula riuruae Young, 1976 | Mar 30, 1972 |  |  | 30 to 40 specimens near the Lake Hotel, including some from a pond that was subject to drying out. | 
| Africatenula riuruae Young, 1976 | Jun 24, 1972 |  |  | 30 to 40 specimens near the Lake Hotel, including some from a pond that was subject to drying out. | 
| Africatenula riuruae Young, 1976 | Jul 31, 1972 |  |  | 30 to 40 specimens near the Lake Hotel, including some from a pond that was subject to drying out. | 
| Macrostomum coxi Young, 1976 | Dec 17, 1971 |  |  | many specimens had oligochaete setae in their gut. | 
| Macrostomum coxi Young, 1976 | Jan 20, 1972 |  |  | many specimens had oligochaete setae in their gut. | 
| Macrostomum coxi Young, 1976 | Mar 30, 1972 |  |  | many specimens had oligochaete setae in their gut. | 
| Macrostomum coxi Young, 1976 | Apr 30, 1972 |  |  | many specimens had oligochaete setae in their gut. | 
| Macrostomum coxi Young, 1976 | Jun 24, 1972 |  |  | many specimens had oligochaete setae in their gut. | 
| Macrostomum coxi Young, 1976 | Jul 31, 1972 |  |  | many specimens had oligochaete setae in their gut. | 
| Gieysztoria papii Young, 1977 | Mar 30, 1972 |  | mud | Littoral of Lake Naivasha near Naivasha Hotel.  Mud with aquatic vegetation.  8 specimens. | 
| Gieysztoria papii Young, 1977 | Jun 24, 1972 |  | mud | Littoral of Lake Naivasha near Naivasha Hotel.  Mud with aquatic vegetation.  6 specimens. | 
| Mesostoma lingua (Abildgaard, 1789) | 1935 or earlier |  |  |  | 
| Phaenocora chappuisi de Beauchamp, 1936 | 1935 or earlier |  |  |  | 
| Strongylostoma radiatum (Müller, 1774) | Dec 17, 1971 |  |  | Temporary pool near jetty at Naivasha Hotel, Lake Naivasha; about 25 m from edge of lat; 8 x 3 m in size and 0.3 m deep; mud and choked with vegetation.  1 specimen. | 
| Mesostoma lingua (Abildgaard, 1789) | 1971 - 1972 |  |  | Lake Naivasha several locations including Kinelli's jetty, Naivasha Hotel.  733 specimens. | 
| Phaenocora foliacea Bohmig, 1914 | 1971 - 1972 |  |  | Lake Naivasha several locations including Kinelli's jetty, Naivasha Hotel.  481 specimens. | 
| Gyratrix hermaphroditus Ehrenberg, 1831 | 1971 - 1972 |  |  | Lake Naivasha several locations including Kinelli's jetty, Naivasha Hotel.  14 specimens. | 
| Mesostoma ehrenbergii (Focke, 1836) | 1972 |  |  | Lake Naivasha, littoral zone (vegetation) at Naivasha Hotel. | 
| Mesostoma ehrenbergii (Focke, 1836) | Apr 30, 1972 |  |  | littoral on Vaughn's Island, 6 km north of Korongo Farm, on the west side of the lake. | 
| Mesostoma ehrenbergii (Focke, 1836) | Jan 1, 1972 |  |  | littoral on Vaughn's Island, 6 km north of Korongo Farm, on the west side of the lake. | 
| Mesostoma ehrenbergii (Focke, 1836) | Jun 24, 1972 |  |  | littoral on Vaughn's Island, 6 km north of Korongo Farm, on the west side of the lake. | 
| Stenostomum leucops (Duges, 1828) | 1971-1972 |  |  | Naivasha to Eldoret road:  littoral region of Lake Naivasha | 
| Stenostomum pseudoacetabulum Nuttycombe & Waters, 1935 | 1971-1972 |  |  | from vegetation and organic debris in the littoral zone (south and west shores). | 
| Mesostoma lingua (Abildgaard, 1789) | 1935 or earlier |  |  |  |