Fig. 1
Shells of examined species. Black scale bars: from Lake Tanganyika. Blue scale bar: from adjacent river systems. Forms next to the letters a–x indicate preferred feeding substrate (circle = mud, hexagon = sand, square = plants, triangle = rock). a Bridouxia ponsonbyi ZMB 220.137-1, b B. grandidieriana BMNH 1889.6.23.57-61, c B. rotundata ZMB 220.063-3, d B. praeclara DBL 19-4, e Spekia zonata ZMB 220.007-2, f Leloupiella minima ZMB 220.008-3, g Reymondia horei ZMB 220.007-1, h Cleopatra johnstoni ZMB 220.102, i Stanleya neritinoides ZMB 102.624-1, j Tanganycia rufofilosa ZMB 102.621-1, k Martelia tanganyicensis ZMB 220.134-1, l Anceya giraudi ZMB 220.000-1, m Syrnolopsis lacustris ZMB 220.046-1, n Chytra kirki SMF 290543-1, o Limnotrochus thomsoni SMF 290542-1, p Tiphobia horei SMF 290550-1, q Paramelania iridescens SMF 290,538, r P. damoni SMF 290531-2, s P. crassigranulata SMF 290528-1, t Mysorelloides multisulcata DBL without number, u Lavigeria spinulosa ZMB 220114, v L. grandis SMF 292827-1, w L. nassa ZMB 220.172-1, x L. livingstoniana ZMB 220116; Scale bars: a–d, f, k, l, m = 2.5 mm; e = 5 mm; g, i, j, n, o, v, w = 10 mm; h = 5 mm; p–s = 20 mm, t = 0.75 mm; u, x = 6 mm