Monteiroconus neugeboreni ( Hoernes & Auinger, 1879 )

Harzhauser, Mathias & Landau, Bernard, 2016, A revision of the Neogene Conidae and Conorbidae (Gastropoda) of the Paratethys Sea, Zootaxa 4210 (1), pp. 1-178 : 113

Monteiroconus neugeboreni ( Hoernes & Auinger, 1879)

Figs 17 U, 26D1–D3

[ Dendroconus ] [ Conus ] Neugeboreni n. f.— Hoernes 1878a: 195 (nomen nudum).

Conus (Dendroconus) Neugeboreni nov. form.— Hoernes & Auinger 1879: 19, pl. 1, fig. 5, pl. 2, fig. 5.

Type material. Holotype NHMW 1949 /0005/0001, Lăpugiu de Sus ( Romania).

Studied material. Holotype.

Illustrated material. Figs 26 D1–D3, 17U: holotype, Lăpugiu de Sus ( Romania), SL: 66 mm, MD: 38 mm, NHMW 1949 /0005/0001; middle Miocene, Badenian (Langhian).

Description: Moderately large shell of pyriform shape. Low conical spire with pointed apex; spire whorls deeply concave in adapical half, forming a convex bulge in abapical part; smooth, suture narrow and regular. Shoulder rounded; last whorl moderately convex above maximum diameter, strongly constricted below; subsutural flexure shallow, moderately curved, moderately asymmetrical. Aperture narrow adapically, widening towards moderately narrow and long canal. Base with narrow, widely-spaced, convex spiral cords; siphonal fasciole very weak; inner lip narrow, slightly twisted. Colour pattern under UV light consisting of numerous, densely spaced spirals of dashes covering the last whorl; the blotches on the shoulder indicated by Hoernes & Auinger (1879, pl. 1 fig. 5) are a misinterpretation or are not visible any more.

Shell measurements and ratios. Holotype: SL: 66 mm, MD: 38 mm, spire angle = 128°, last whorl angle = 39°, LW = 1.74, RD = 0.64, PMD = 0.8, RSH = 0.1.

Discussion. At first sight, this species might be considered synonym with Pseudonoduloconus austriacus ( Hoernes & Auinger, 1879) , due to its pyriform shape. It differs, however, in the narrower, deeply concave spire whorls, the regular suture, the rounded shoulder and the even more pronounced constriction of the base. The aperture is adapically narrower, as is the siphonal canal. The position of maximum diameter is placed lower, resulting in a Ficus -like outline and lastly M. neugeboreni ( Hoernes & Auinger, 1879) lacks the subobsolete tubercles on the spire whorls seen in P. austriacus . As the fig-shaped outline is also atypical for Monteiroconus , this generic placement is tentative.

Paleoenvironment. No information is available; shallow water elements are frequently found transported into deep marine settings at Lăpugiu de Sus.

Distribution in Paratethys. Badenian (middle Miocene): Transylvanian Basin: Lăpugiu de Sus ( Romania) ( Hoernes & Auinger 1879).

Figures

FIGURE 26 A 1 – A 3. Monteiroconus hoernesi (Doderlein, 1863), Grund (Austria), NHMW 1851 / 0002 / 0004, lectotype. 26 B 1 – B 3. Monteiroconus hoernesi (Doderlein, 1863), Lăpugiu de Sus (Romania), NHMW 1870 / 0033 / 0001. 26 C 1 – C 3. Monteiroconus hoernesi (Doderlein, 1863), Gainfarn (Austria), NHMW 1856 / 0050 / 0110. 26 D 1 – D 3. Monteiroconus neugeboreni (Hoernes & Auinger, 1879), Lăpugiu de Sus (Romania), NHMW 1949 / 0005 / 0001. 26 E 1 – E 2. Monteiroconus pervindobonensis (Sacco, 1893), Bad Vöslau (Austria), NHMW 1869 / 0001 / 0020. 26 F 1 – F 3. Monteiroconus supracompressus (Sacco, 1893), Mikulov (Czech Republic), NHMW 1851 / 0010 / 0004, holotype. 26 G 1 – G 3. Monteiroconus supracompressus (Sacco, 1893), Mikulov (Czech Republic), NHMW 2016 / 0034 / 0001. 26 H. Monteiroconus supracompressus (Sacco, 1893), Mikulov (Czech Republic), NHMW 2016 / 0034 / 0001. 26 I. Monteiroconus mojsvari (Hoernes & Auinger, 1879), Pötzleinsdorf (Austria), NHMW 1847 / 0037 / 0024. 26 J. Monteiroconus mojsvari (Hoernes & Auinger, 1879), Gainfarn (Austria), NHMW 1853 / 0010 / 0001, syntype.