Lautoconus pestensis

Harzhauser, Mathias & Landau, Bernard, 2016, A revision of the Neogene Conidae and Conorbidae (Gastropoda) of the Paratethys Sea, Zootaxa 4210 (1), pp. 1-178 : 86-87

Lautoconus pestensis nov. sp.

Figs 17 C, 20A1–A3, 20B1–B3, 20C1–C2, 20D1–D3

? Conus (Chelyconus) avellana ( Lamarck, 1810) — Atanacković 1985: 176, pl. 39, fig. 9 [non Conus avellana Lamarck, 1810 ]. Chelyconus miovoeslauensis (Sacco, 1893) — Kovács & Vicián 2013: 60, figs 11–15 [non Lautoconus bitorosus miovoeslauensis (Sacco, 1893) ]

Holotype: Figs 20A 1 –A3: SL: 25.2 mm, MD: 15.2 mm, NHMW 2016/0008/0001.

Paratype: Figs 20 B1–B3, 34C: SL: 20.4 mm, MD: 11.8 mm, NHMW 2016/0008/0002.

Paratype: Figs 20 C1–C2: SL: 19.2 mm, MD: 10.7 mm, NHMW 2016/0008/0002.

Paratype: Figs 20 D1–D3: SL: 23.6 mm, MD: 13.1 mm, NHMW 2016/0008/0004.

Additional material: 12 specimens, NHMW 2016 /0008/0004, all specimens from Letkés , Hungary.

Type stratum: fossil-rich marly sand with coral blocks and andesite boulders of the Sámsonháza Formation ( Császár 1997).

Type locality: Letkés at the western part of the Börzsöny Mts. ( Hungary); see Kovács & Vicián (2013) for a map and description.

Age: Middle Miocene, early Badenian (= Langhian).

Etymology: Referring to Pest, the county of the type locality Letkés in Hungary.

Description. Small stout-olivoid shells with low mammillate to weakly cyrtoconoid spire; spire whorls smooth, weakly convex; suture impressed. Last spire whorl relatively broad, passing via rounded shoulder in ventricose last whorl. Subsutural flexure shallow, weakly curved, strongly asymmetrical. Position of maximum diameter in posterior quarter of last whorl; faint constriction at base. Siphonal canal very short, slightly recurved; siphonal fasciole short, twisted, weakly swollen. About 5 deep spiral grooves on base delimitate broad flat spiral cords. Aperture narrow, strongly narrowing posteriorly, slightly widening towards siphonal canal. Very intense colour pattern in UV light consisting of broad spirals of densely spaced subquadratic to weakly rectangular spots; not axially arranged. Slightly axially elongated, prosocline dots on shoulder; additional dots and narrow flammulae on spire whorls.

Shell measurements and ratios. n = 12: largest specimen: SL: 28.5 mm, MD: 16.4 mm, mean SL: 22.3 mm (σ = 2.8), mean MD: 12.9 mm (σ = 1.7), spire angle: µ = 116.6° (σ = 6.0°), last whorl angle: µ = 37.3° (σ = 1.2°), LW: µ = 1.7 (σ = 0.04), RD: µ = 0.67 (σ = 0.02), PMD: µ = 0.83 (σ = 0.02), RSH: µ = 0.13 (σ = 0.00).

Discussion. Among the Paratethyan Conidae , only Lautoconus olivaeformis ( Hoernes & Auinger, 1879) has a comparable olivoid outline but differs in its higher spire, narrower shape and the colour pattern of broad bands. The specimen from the Badenian of Bosnia and Herzegovina illustrated by Atanacković (1985, pl. 39, fig. 9) might represent this species as well, although it is more barrel-shaped.

Paleoenvironment. The locality Letkés comprises a mixed assemblage of partly reworked taxa ( Kovács & Vicián 2013); the frequent occurrence of corals suggests a shallow marine depositional environment.

Distribution in Paratethys. Badenian (middle Miocene): Pannonian Basin: Letkés ( Hungary);? southern Pannonian Basin: Hrvaćani ( Bosnia and Herzegovina).

Figures

FIGURE 1. Map of central and south – eastern Europe showing the geographic position of selected localities with rich Conidae diversities (modified from Kováč et al. 2007). 1: Korytnica (Poland), 2: Podhorce, Zukowce, Biłka, Tarnopol (Ukraine), 3: Grund, Guntersdorf, Immendorf (Austria), 4: Steinebrunn (Austria), Mikulov (Czech Republic), 5: Gainfarn, Enzesfeld, Baden, Bad Vöslau, Baden-Sooß (Austria), 6: Ritzing (Austria), 7: Weitendorf, Pöls (Austria), 8: Letkés, Szob (Hungary), 9: Borsodbóta (Hungary), 10: Várpalota (Hungary), 11: Hidas (Hungary), 12: Coşteiu de Sus, Lăpugiu de Sus (Romania).

FIGURE 20 A 1 – A 3. Lautoconus pestensis nov. sp., Letkés (Hungary), NHMW 2016 / 0008 / 0001, Holotype. 20 B 1 – B 3. Lautoconus pestensis nov. sp., Letkés (Hungary), NHMW 2016 / 0008 / 0002, paratype. 20 C 1 – C 2. Lautoconus pestensis nov. sp., Letkés (Hungary), NHMW 2016 / 0008 / 0002, paratype. 20 D 1 – D 3. Lautoconus pestensis nov. sp., Letkés (Hungary), NHMW 2016 / 0008 / 0004, paratype. 20 E 1 – E 3. Lautoconus quaggaoides nov. sp., Letkés (Hungary), NHMW 2016 / 0009 / 0001, holotype. 20 F 1 – F 3. Lautoconus quaggaoides nov. sp., Letkés (Hungary), NHMW 2016 / 0009 / 0002, paratype. 20 G 1 – G 2. Lautoconus quaggaoides nov. sp., Letkés (Hungary), NHMW 2016 / 0009 / 0003, paratype. 20 I 1 – I 3. Lautoconus quaggaoides nov. sp., Letkés (Hungary), NHMW 2016 / 0009 / 0004 a, paratype. 20 J. Lautoconus quaggaoides nov. sp., Letkés (Hungary), NHMW 2016 / 0009 / 0004 b, paratype. 20 H 1 – H 3. Lautoconus quaggaoides nov. sp., Letkés (Hungary), private collection Anton Breitenberger.