Pustulosia gubkini ( Ossipov, 1932 )

Pustulosia gubkini ( Ossipov, 1932)

Figs 70D–E View FIGURE 70

Cerithium aff. procrenatum Sacco — Sokolov 1899: 36 , 79, pl. 4, figs 20 – 22.

* Cerithium gubkini n. sp. — Ossipov 1932: 67, pl. 4, figs 14–15.

Cerithium aff. procrenatum Sacco — Paramonova 1967: 106 , pl. 1, fig. 25.

Potamides gubkini ( Ossipov, 1932) — Zelinskaya et al. 1968: 158.

Type material. Lectotype selected herein: TSNIGR 458 /302, SL: 15.7 mm, MD: 5.9 mm, illustrated also in Sokolov (1899: pl. 4, figs 20–21), Fig. 70D View FIGURE 70 . Paralectotype: TSNIGR 459 /302 , SL: 11.7 mm, MD: 5.4 mm, specimen illustrated in Sokolov (1899: pl. 4, fig. 22), Fig. 70E View FIGURE 70 . Konka River near Yul’ivka ( Ukraine), late Konkian, Middle Miocene .

Revised description. Medium sized, moderately slender shell; apical angle~25°.Protoconch and early teleoconch whorls unknown. Spire whorls straight sided, with periphery below mid-whorl, coinciding with abapical nodose spiral cord. Suture weakly incised. Spiral sculpture of two primary cords at adapical suture and below mid-whorl, bearing close-set rounded beads. Third, narrower weakly beaded cord at abapical suture. Up to one weaker, smooth secondary cord between primary cords. Middle primary cord slightly more prominent, occasionally splitting on last whorl resulting in trifid beads. No distinct axial sculpture, although beads may be vaguely axially interconnected, following slightly prosocline growth lines. Base convex, moderately constricted, with three prominent spiral cords with weaker cord intercalated in interspaces. Aperture broken. Columella strongly excavated. Columellar callus partially preserved, forming rim.

Discussion. This species was not listed by Harzhauser et al. (2023a) as it was included in Cerithiidae by most authors. The available material is abraded and the sculpture poorly preserved. Sokolov (1899) and Ossipov (1932) discussed a relation to the Badenian specimens, described herein as Thericium poetzleinsdorfense ( Sacco, 1895) , but the species is not a Cerithiidae . It might be a late Badenian offshoot of the widespread Paratethyan Pustulosia submitralis ( Eichwald, 1851) , from which it differs in its smaller size, smaller beads and somewhat blurred sculpture. More material would be needed to decide if it is a subjective junior synonym of that species. This species is only known from the type locality. Zhgenti (1958: 83, pl. 9, fig. 17) described ‘ Cerithium gubkini ’ from several localities in Georgia, but the illustrated specimen is so poorly preserved that it is undeterminable. It might represent another Batillariidae .

Paleoenvironment. Found in shelly sands, shallow marine, inner neritic (own data A. G.).

Distribution. Late Konkian of the Eastern Paratethys.

Eastern Paratethys. Late Konkian (Middle Miocene): Black Sea Lowland : Konka River near Yul’ivka (Zaporizhzhia Region, Ukraine) ( Sokolov 1899; Paramonova 1967).