Aclis canaliculata (E.A. Smith, 1890) comb. nov.

Fig. 22

Amaurella canaliculata E.A. Smith, 1890: 280, pl. 23, Fig. 27.

Type material. Lectotype (herein designated): NHMUK 1889.10.1.612 . Paralectotypes: Saint Helena: NHMUK 1889.10.1.613–616 [4] .

Type locality. Saint Helena .

Material examined. Saint Helena: ANSP 67898 [1].

Remarks. The current classification of this species in the Microstelma A. Adams, 1863 ( Zebinidae) (MolluscaBase 2023c) should be revised. It was originally described in the genus Amaurella A. Adams, 1867, which was demonstrated by Ponder (1985) to be a junior synonym of Microstelma . Ponder (1985) described the presence of weak to moderate axial ribs that do not extend over the base of the teleoconch whorls in Microstelma, which are lacking in Aclis . The original description, observations on the type series (Fig. 22A, B) and of one topotype clearly indicate that the species has a completely smooth teleoconch, except for strong incremental scars typical of Eulimidae . Therefore, we propose a new combination of the species in Aclis .

The shell herein designated as the lectotype is the figured specimen by E.A. Smith (1890: pl. 23, Fig. 27) (Fig. 22A). All shells of the type series are glued to a cardboard (Fig. 22A, B). The topotype of A. canaliculata comb. nov. from the ANSP (Fig. 22C, D) contains a label by A. Warén (10 Feb. 2003) indicating that this shell is a type and most probably a syntype . This shell was donated to the ANSP by G.B. Sowerby and there is no evidence that E.A. Smith studied this specimen. Thus, we do not consider the shell of ANSP 67898 as a syntype .