Cirsotrema menkveldae Pfister & Wegmüller, 2007

Harzhauser, Mathias & Landau, Bernard M., 2025, The Epitoniidae (Gastropoda, Epitonioidea) of the Miocene Central Paratethys Sea-an overwhelming diversity, Zootaxa 5630 (1), pp. 1-142 : 45-46

publication ID	https://doi.org/10.11646/zootaxa.5630.1.1
publication LSID	lsid:zoobank.org:pub:89462472-D932-4255-880F-C6EF15220A31
persistent identifier	https://treatment.plazi.org/id/03D787A4-FFC9-FFC9-FF3F-F998FD599411
treatment provided by	Plazi
scientific name	Cirsotrema menkveldae Pfister & Wegmüller, 2007
status

Treatment

Figs 17D–E View FIGURE 17

* Cirsotrema menkveldae n. sp. — Pfister & Wegmüller 2007: 156, pl. 2, figs 13–14.

Type material. Holotype, NMBE Nr. B 7648, SL: 24 mm, MD: 11 mm, Hohburggraben, Belpberg, illustrated in Pfister & Wegmüller (2007: pl. 2, figs 5–9), Figs 17D View FIGURE 17 1 –D View FIGURE 1 3 View FIGURE 3 . Paratype, NMBE Nr. B 7649, SL: 18 mm , MD: 10 mm, Hohburggraben, Belpberg, illustrated in Pfister & Wegmüller (2007: pl. 2, figs 10–12), Figs 17E View FIGURE 17 1 –E View FIGURE 1 3 View FIGURE 3 . Pictures: Peter Vollenweider .

Revised description. Shell large, turreted, moderately slender (apical angle ~20°), weakly coronate. Protoconch and first teleoconch whorls unknown. Early teleoconch whorls very high, subcylindrical to weakly scalate with narrow subsutural ramp and marked shoulder angulation. Suture deeply impressed, largely obscured by varices. Sculpture of prominent, close-set, prosocline to weakly sigmoidal varices with flat crests and narrow interspaces (?: 18/20: 21). Several very prominent, convex varices occurring at irregular intervals. Up to ten prominent spiral cords in interspaces, forming small nodes on weaker varices. Protruding varices on last whorl with low spines at shoulder. Last whorl attaining about 40% of total height, moderately convex with weak basal angulation and very prominent peribasal cord, separating moderately narrow basal disc bearing prominent varices. Aperture subcircular. Columella concave. Fasciole short, broad, with prominent growth lines. Columellar callus and parietal callus forming continuous moderately broad rim, detached from base. Peristome poorly preserved, duplex. No umbilicus.

Discussion. Cirsotrema menkveldae Pfister & Wegmüller, 2007 probably belongs to the C. pumiceum ( Brocchi, 1814) species group but differs from other species in the group by the slightly sigmoidal varices and the greater number of protruding varices. Cirsotrema dertonense ( Sacco, 1891) is stockier and has a much broader subsutural shelf.

Paleoenvironment. Shallow marine, inner neritic.

Distribution in Central Paratethys. Eggenburgian/Ottnangian (Early Miocene): North Alpine Foreland Basin: Belpberg ( Switzerland) ( Pfister & Wegmüller 2007).