Shell cylindrical, very small, semi-transparent, with heterostrophic topwhorl. Sculpture of spiral lines, present in all the whorls of the teleoconch, except for the subsutural zone which is smooth. A deep sinus is present in the outer lip; under this a keel may be detected. The heterostrophic protoconch smooth, flattened, only slightly tilted in relation to the teleoconch whorls. The black soft parts are clearly visible, due to the transparency of the shell.
almost colorless, translucent.
common size :
1.6 - 1.7 mm in length.
Murchisonella is easily distinguishable among Anisocyclidae for its cylindrical shell with a flattened protoconch and truncated outline. The sculpture of juveniles of some species of native Aclididae [Aclis minor (Brown, 1827), Aclis ascaris (Turton, 1819)] could lead to in misidentification, but the presence of the heterostrophic topwhorl solves the problem for a sure identification of M. columna.
BIOLOGY / ECOLOGY
on algal turfs of shallow water.