Taxon classification Animalia ORDO FAMILIA

Gyraulus okrugljakensis nom. n.

Planorbis clathratus Brusina, 1884: 171, pl. 30, fig. 29 [non Planorbis (Helisoma) clathratus Sandberger, 1880].

Gyraulus (Gyraulus) clathratus (Brusina); Wenz 1923c: 1545 [non Sandberger 1880].

Etymology.

Named after the type locality.

Type locality.

Okrugljak (today within the city limits of Zagreb), Croatia.

Age.

Late Miocene (Late Pannonian, Portaferrian; Geary et al. 2010).

Syntype.

Croatian Natural History Museum, Zagreb, coll. no. 2953-599/1 (Milan et al. 1974, p. 117).

Discussion.

This species represents a primary homonym of Planorbis (Helisoma) clathratus Sandberger, 1880 from the Pleistocene of West Runton, Norfolk, United Kingdom. We follow Wenz (1923c), who placed Brusina's species within Gyraulus . The classification of the British species within Helisoma by Sandberger is rather doubtful. This North American genus was artificially introduced to Europe, wherefore an occurrence in the Pleistocene of the British Isles is unlikely. The morphology as depicted in Sandberger (1880) suggests an attribution to Planorbarius .