Phenacohelix mahlfeldae Goulstone 2001

Goulstone 2001. A revision of the genus Phenacohelix Suter, 1892 (Mollusca: Pulmonata) with descriptions of four new species and reassignment of Thalassohelix ziczag (Gould, 1846). Records of the Auckland Museum, 38 2001: 39-82