Metaruncina Baba, 1967

Chernyshev, Alexei V., 2021, A new species of Metaruncina (Gastropoda: Heterobranchia: Runcinida) from Vietnam with a discussion on the so-called rudimentary radula in runcinids, Zootaxa 4974 (1), pp. 197-200 : 197

Genus Metaruncina Baba, 1967

Diagnosis. Shell small, plate-like, internal, posterior. Foot without posterior ventral furrow. Single gill with lamellae on right posterior side of body. Opaline gland present but not projecting outside. Jaw consists of scale-like elements, anterior elements with denticles. “Rudimentary” radula of “juvenile” type, asymmetrical, 3-4 × 0. R.1–1. R.1(?0. R.2). Gizzard with 4 plates. Spermatheca absent .