Lautoconus rotundus Hoernes & Auinger 1879
Creators: name: Harzhauser, Mathias
name: Landau, Bernard
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Conidae
Lautoconus
Lautoconus rotundus

description: Lautoconus rotundus (Hoernes & Auinger, 1879)
Figs 17 E, 21A1–A3
[Chelyconus] [Conus] rotundus n. f. — Hoernes 1878a: 195 (nomen nudum).
Conus (Chelyconus) rotundus nov. form.— Hoernes & Auinger 1879: 50, pl. 6, fig. 8.
Conus (Chelyconus) rotundus Hoernes et Auinger—Csepreghy-Meznerics 1956: 419, pl. 10, figs 5–6.
Conus (Chelyconus) rotundus Hoernes & Auinger—Strausz 1966: 458, pl. 69, figs 9–10.
Conus (Chelyconus) rotundus Hoernes & Auinger—Bałuk 1997 (partim): 64, pl. 22, figs 4–5 (non 6–8).
Chelyconus rotundus (Hoernes et Auinger, 1879) — Kovács & Vicián 2013 (partim): 61, figs 17–18 (19?) [non fig. 16 = Lautoconus quaggaoides nov. sp.].
Type material. Syntypes: 1 spec. NHMW 1858 /0015/0072, Steinebrunn (Austria), illustrated in Hoernes & Auinger (1879, pl. 6, fig. 8), 1 spec. NHMW 1853 /0003/0003, Gainfarn (Austria), 3 spec. NHMW 1867 /0019/ 0 0 0 3, Coşteiu de Sus (Romania); middle Miocene, Badenian (late Langhian).
Studied material. Syntypes.
Illustrated material. Figs 17 E, 21A1–A3: syntype, Steinebrunn (Austria): SL: 42.2 mm, MD: 25.0 mm, NHMW 1858/0015/0072, illustrated in Hoernes & Auinger (1879, pl. 6, fig. 8).
Revised description. Medium-sized shells with low conical to weakly cyrtoconoid spire and faintly ventricose last whorl. Early spire pointed, later whorls weakly convex with more or less prominent striae, which may grade into delicate cords on the last whorl. Most prominent spiral cord coincides with angulate shoulder. Deep suture; subsutural flexure of medium depth, strongly curved, moderately asymmetrical. Last whorl with spiral cords on lower third; weakly constricted at base with short canal; siphonal fasciole indistinct. No colour pattern preserved.
Shell measurements and ratios. Only two adult specimens are available: SL: 42.2/ 34.1 mm, MD: 25.0/ 20.5 mm, spire angle: 129/125°, last whorl angle: 36/38°, LW: 1.69/1.66, RD: 0.65/0.69, PMD: 0.90/0.90, RSH: 0.08/ 0.13.
Discussion. Hall (1966) discussed a close relationship between Lautoconus rotundus and L. bitorosus (Fontannes, 1880), which is larger and lacks a distinct angulation along the shoulder. Some of the specimens identified as Conus rotundus by Bałuk (1997, pl. 22, figs 7–8) differ in their elongate outline, the twisted siphonal fasciole and long siphonal canal and represent another species.
Paleoenvironment. Probably shallow coastal environments based on its occurrence at Gainfarn and Steinebrunn (Zuschin et al. 2007).
Distribution in Paratethys. Badenian (middle Miocene): Vienna Basin: Gainfarn, Steinebrunn (Austria) (Hoernes & Auinger 1879); Carpathian Foredeep: Korytnica (Poland) (Bałuk 1997); Pannonian Basin: Pécsszabolcs, Szob, Letkés (Hungary) (Kovács & Vicián 2013); Transylvanian Basin: Lăpugiu de Sus, Coşteiu de Sus (Romania) (Hoernes & Auinger 1879).
description: Published as part of Harzhauser, Mathias & Landau, Bernard, 2016, A revision of the Neogene Conidae and Conorbidae (Gastropoda) of the Paratethys Sea, pp. 1-178 in Zootaxa 4210 (1) on pages 90-92, DOI: 10.11646/zootaxa.4210.1.1, http://zenodo.org/record/252966