Vaceuchelus, : Iredale, 1929

Herbert, D. G., 2012, A revision of the Chilodontidae (Gastropoda: Vetigastropoda: Seguenzioidea) of southern Africa and the south-western Indian Ocean, African Invertebrates 53 (2), pp. 381-381 : 447

Key to species of Vaceuchelus in the south-western Indian Ocean

1 Shell whitish, usually boldly marked with dark brown to black blotches ............... ............................................................................................................ semilugubris

– Shell more uniform in colour, whitish to dirty buff, occasionally with ashy-grey axial bands..............................................................................................................2

2 Adult length up to 8.5 mm; columella with a broad, low, rounded swelling at its base........................................................................................................... cretaceus

– Small (adult length <5.0 mm); columella lacking a basal swelling.......................3

3 Base with 3 major spiral cords (sometimes a weaker 4 th adjacent to columella); umbilicus closed in adult; protoconch diameter ca 340 µm .................... gemmula

– Base with 4 major spiral cords (sometimes with a weaker 5 th spiralling into umbilicus); umbilicus open in adult, albeit narrow; protoconch 260–300 µm..............4

4 Final quarter of last adult whorl with intermediary spiral cords present above periphery ....................................................................................................... jayorum

– No intermediary spiral cords present on last adult whorl ....................... natalensis