Fig. 5 in Early ontogeny and palaeoecology of the Mid-Miocene rissoid gastropods of the Central Paratethys

Fig. 5. Two species of Rissoa Desmarest, 1814. A. Rissoa similis Scacchi, 1836. Specimen (NHMW 2002z0030/0005), Recent, from the Adriatic Sea (A1). Protoconch of the same specimen in lateral view (A2). B. Rissoa costeiensis sp. nov. Holotype (NHMW 2002z0030/0006) from the Badenian of Coştei, Romania (B1). Protoconch of the same specimen in lateral and apical views (B2, B3). The protoconch is terminated by closely spaced, sinuous, thickened growth lines. The onset of the teleoconch is indicated by a prominent incision of the whorl.