Fig. 5M
Toledonia perplexa Dall, 1902: 513; Dell, 1990: 259, figs. 457–461 (synonymy)
Admete limneaeformis (sic)— Melvill & Standen, 1912: 131 (non Smith, 1879)
Examined material. 6 an. and 11 sh. (MACN-In 40707); holotype (USNM 109022).
Description. Shell height to 2.5 mm (up to 4.1 mm according to Dall 1902); elongate-ovate, delicate. Protoconch of 1.5 slightly convex whorls. Teleoconch of up to 2 whorls, slightly convex in outline; last whorl comprising about 85% of total shell height. Suture deep, slightly channeled. Surface white; only sculptured with faint growth lines. Aperture ovate, interior white; columella with a strong fold, callus narrow, slightly expanded over the umbilical area.
Remarks. Based on the study of shell morphology, Dell (1990) concluded that Toledonia limnaeaeformis (Smith, 1879) and T. perplexa are two different species, with only the latter present in Patagonian waters. The material studied here is similar to T. perplexa, although differs by having a lower spire. The significance of such differences could not be determined given the poor current state of knowledge of the group.