Thericium egerense ( Gábor, 1936 )

Thericium egerense ( Gábor, 1936)

Fig. 51A View FIGURE 51

* Cerithium egerense View in CoL n. sp. — Gábor 1936: 2, pl. 1, fig. 5.

Cerithium egerense Gábor, 1936 View in CoL — Báldi 1973: 262, pl. 29, fig. 4.

Cerithium egerense Gábor— Kovács & Vicián 2016: 246 View in CoL , pl. 1, fig. 8.

Type material. Holotype, illustrated in Gábor (1936: pl. 1, fig. 5), Mining and Geological Survey of Hungary (Budapest). Eger ( Hungary), Late Oligocene , Egerian.

Illustrated material. M 2016.59, SL: 37 mm, MD: 17 mm, Esztergom-Szentgyörgymező ( Hungary), illustrated in Kovács & Vicián (2016: pl. 1, fig. 8), Fig. 51A View FIGURE 51 .

Additional material. M 63/3118, illustrated in Báldi (1973: pl. 29, fig. 4) seems to be lost (pers comm. Alfréd Dulai, 2023).

Revised description. Large, moderately slender shell of more than ten teleoconch whorls; apical angle 30°. Protoconch and early teleoconch whorls unknown. Later teleoconch with broad, vertical, concave subsutural ramp, weak roundly angled shoulder, convex below, separated by shallow, linear to weakly undulating suture. Low, broad, widely spaced ribs developed below shoulder, forming large, axially elongated tubercles marking periphery, tubercles strengthening abapically and strongest on penultimate whorl, 8–9 on last whorl, weakening again and subobsolete on last whorl. Spiral sculpture of about 17 narrow, flattened spiral cords separated by narrow grooves. Last whorl not preserved.

Discussion. Thericium egerense is characterized by its reduced axial sculpture and the prominent, band-like spiral cords. It is reminiscent of the Middle Miocene Thericium potzleindorfense ( Sacco, 1895) but differs in its slender conical spire and the blunt morphology of the tubercles, which are pointed in T. potzleindorfense . The placement in Thericium is tentative.

Paleoenvironment. Unknown.

Distribution. Thericium egerense is a rare element in the assemblages of the Egerian of the Central Paratethys Sea.

Central Paratethys Sea. Egerian (Late Oligocene/Early Miocene): Hungarian Paleogene Basin: Eger ( Hungary) ( Báldi 1973); Esztergom Basin: Esztergom-Szentgyörgymező ( Hungary) ( Kovács & Vicián 2016).