Thericium potzleindorfense ( Sacco, 1895 )

Thericium potzleindorfense ( Sacco, 1895)

Figs 27N, 54A–D

Cerithium minutum Serr.— Hörnes 1855 View in CoL (pars): 390, pl. 41, fig. 8 [non Thericium minutum ( Naumann, 1852) View in CoL ].

* [ Cerithium View in CoL ] potzleindorfensis Sacc.— Sacco 1895: 13 .

Type material. Holotype: NHMW 1846 View Materials /0037/0360, SL: 38.4 mm, MD: 18.2 mm, Vienna / Pötzleinsdorf ( Austria), illustrated in Hörnes (1855: pl. 41, fig. 8), Figs 54B 1 –B View FIGURE 1 2 View FIGURE 2 .

Illustrated material. NHMW 2023 View Materials /0028/0003, SL: 40.9 mm, MD: 18.8 mm, Vienna / Pötzleinsdorf ( Austria), Figs 54A 1 –A View FIGURE 1 2 View FIGURE 2 . NHMW 1878 View Materials /0041/0020, SL: 34.9 mm, 14.1 MD: mm, Vienna / Pötzleinsdorf ( Austria), Figs 54C 1 – C View FIGURE 1 2 View FIGURE 2 . NHMW 2023 View Materials /0028/0004, SL: 34.6 mm, MD: 12.4 mm, Vienna / Pötzleinsdorf ( Austria), Figs 54D 1 –D View FIGURE 1 2 View FIGURE 2 . NHMW 2023 View Materials /0028/0005, SL: 27.4 mm, MD: 12.1 mm, Vienna / Pötzleinsdorf ( Austria), Fig. 27N.

Additional material. 34 spec., NHMW 2023 View Materials /0051/0001, Vienna / Pötzleinsdorf ( Austria) .

Revised description. Medium-sized, pupoid shell of up to 11 teleoconch whorls, attaining ~ 34–41 mm in height; apical angle ~50°. Protoconch unknown. Early teleoconch whorls weakly shouldered just below mid-whorl with broad, low axial ribs, crossed by delicate spiral threads. Later whorls shoulder, bearing small, wide-spaced, slightly pointed tubercles. Faint subsutural collar with indistinct tubercles appears around sixth to seventh whorl. Whorl profile weakly concave below adsutural cord, convex below shoulder. Sculpture consisting of numerous narrow flattened spiral cords of irregular width, separated by narrow, shallow grooves. Whorl height strongly increasing on last two spire whorls. Suture narrowly incised, irregularly and weakly undulating, strongly descending on last whorl towards aperture. No varices on spire whorls. Last whorl moderately high, convex, attaining ~50% of total height, weakly constricted into concave neck. Last whorl with one broad varix opposite aperture. Base covered by numerous secondary and tertiary spiral cords; slightly strengthened peribasal cord and cord delimiting neck. Aperture ovate. Columella broadly and strongly excavated. Columellar callus forming broad rim, sharply delimited from base.Anal canal incised, weak parietal denticle. Outer lip wide, somewhat flared abapically, weakly thickened. Siphonal canal short, deeply incised, slightly recurved, strongly deflected to the left, distinctly notched.

Discussion. This species is morphologically closely related to Thericium minutum ( Naumann, 1852) but differs in its dome-shaped spire, the stockier profile, and the more prominent and regular spiral sculpture. Thericium potzleindorfense ( Sacco, 1895) might represent a late Badenian offshoot of Thericium minutum ( Naumann, 1852) and could also be interpreted as chronosubspecies. Hörnes (1855) illustrated two specimens as Cerithium minutum de Serres, 1822 , which are not conspecific. Cerithium minutum sensu Hörnes 1855 : pl. 41, fig. 9 is conspecific with C. minutum Naumann, 1852 . For the second specimen, illustrated by Hörnes (1855: pl. 41, fig. 8), Sacco (1895) introduced Cerithium potzleindorfensis as new name. This name seems to be in conflict with Cerithium procrenatum pötzleinsdorfensis Sacco, 1895 published by Sacco (1895) in the same monograph. Both names, however, are available because Article 57.6 of the ICZN (1999) states: “ a one-letter difference between species-group names combined with the same generic name is sufficient to prevent homonymy ”. According to article 32.5 of the ICZN special characters like ä, ö and ü used in species names before 1985 must be corrected to ae, oe and ue. In addition, both names differ in the ‘s’ in poetzleinsdorfensis . Therefore, Cerithium potzleindorfense and Cerithium poetzleinsdorfense are both available, although the situation is not ideal and potzleindorfensis was most probably a lapsus.

Paleoenvironment. The occurrence at Vienna / Pötzleinsdorf ( Austria) suggests a preference for sandy inner neritic habitats (own data M.H.) .

Distribution. Known so far only from the late Badenian (early Serravallian) of the Central Paratethys Sea. Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Vienna /Pötzleinsdorf ( Austria) (Hörnes

1856).