Molecular evidence supports an african affinity of the neotropical freshwater gastropod, Biomphalaria glabrata, say 1818, an intermediate host for Schistosoma mansoni.
G Campbell, C S Jones, A E Lockyer, S Hughes, D Brown, L R Noble, and D Rollinson
Proc Biol Sci. 2000 December 7; 267(1460): 2351–2358. PMCID: PMC1690836