33. Gyraulus costulatus (Krauss, 1848)

Distribution and year: Boro River, Nxaraga Lagoon, Chief’s Island Maun [ETD4294] 1984 (Brown et al. 1992); Okavango Delta, Maun N/A (Brown & Van Eeden 1969).

Geographic range: Algeria, Angola, Benin, Botswana, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Congo, Democratic Republic of the Congo, Egypt, Equatorial Guinea, Eswatini, Ethiopia, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Kenya, Liberia, Libya, Malawi, Mali, Mauritania, Mozambique, Namibia, Niger, Nigeria, Senegal, Sierra Leone, South Africa, South Sudan, Sudan, Tanzania, Togo, Uganda, Zambia, Zimbabwe.

Habitat: Freshwater.

Notes: The species is ubiquitous across Africa, including the tropical regions (Albrecht et al. 2018 a). The molluscs dwell on vegetation and stones in rivers, lakes and dams (Brown 1994).

Type locality: Umgeni Valley, KwaZulu-Natal, South Africa (Krauss 1848) .

Sources: Brown et al. (1992: 28); Appleton & Miranda (2015: 130).

Conservation status: Least Concern.