Acroptychia (?) optio (Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1993), 1877

Páll-Gergely, Barna, 2025, Boucardicus must have microtunnels! Reassignment of three species into Acroptychia (Gastropoda: Caenogastropoda: Hainesiidae), Zootaxa 5666 (2), pp. 287-293 : 291

Acroptychia (?) optio (Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1993)

Fig. 2E–F

Boucardicus optio Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1993: 61 , figs 44, 45.

Boucardicus optio ,— Emberton, 2002: 96, pl. 3, fig. 13.

Material examined. Madagascar Sud-Est , chaines Anosyennes, 20.xi.1971, Ch. Blanc leg. MNHN-IM-2000-35176 ( holotype) , MNHN-IM-2000-35293 ( paratype), MNHN-IM-2000-35294 ( 3 juvenile paratypes).

Remarks. A holotype, a paratype in good condition, and 3 juvenile paratypes were examined. In the holotype there is a small white circle just behind the thickening, and it resembles an opening for the microtunnels. However, this was just a correction of the shell after some damage, which is visible also from the outside. The paratype clearly had no sign of an opening behind the thickening.

Figures

FIGURE 2. Shells of Madagascan Hainesiidae (species previously classified in Boucardicus). A–B. Acroptychia boulangeri (Fischer-Piette, C.P. Blanc, F. Blanc & Salvat, 1993), MNHN-IM-2000-35172 (holotype). C–D. Acroptychia (?) culminans (Fischer-Piette, C. P. Blanc, F. Blanc & F. Salvat, 1993), MNHN-IM 2000-35177 (holotype). E–F. Acroptychia (?) optio (Fischer- Piette, C. P. Blanc, F. Blanc & F. Salvat, 1993), MNHN-IM-2000-35176 (holotype). All photos: B. Páll-Gergely.