Kalloconus tietzei ( 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 : 69-71

Kalloconus tietzei ( Hoernes & Auinger, 1879)

Figs 3 S, 13G1–G5

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

Conus (Lithoconus) Tietzei nov. form.— Hoernes & Auinger 1879: 28 (partim), pl. 1, fig. 3.

Conus (Lithoconus) tietzei (Hoernes & Auinger) — Atanacković 1969: 215, pl. 12, figs 14–15.

Conus (Dendroconus) aldrovandi Brocchi—Atanacković 1969: 213 , pl. 13, figs 1–1b [non Conus aldrovandi Brocchi, 1814 ].

Conus (Lithoconus) tietzel [sic] Hoernes & Auinger, 1880— Atanacković 1985: 180, pl. 40, figs 3–4.

Conus (Lithoconus) karreri Hoernes & Auinger, 1879 — Atanacković 1985: 180, pl. 40, figs 5–6 [non Conus karreri Hoernes & Auinger, 1879 ].

Monteiroconus tietzei ( Hoernes et Auinger, 1879) — Kovács & Vicián 2013 (partim): 79, figs. 93, 95–96? (non figs 92, 94 = Kalloconus letkesensis nov. sp.).

Type material. Syntype NHMW 1847 /0046/0004, Szob ( Hungary), illustrated in Hoernes & Auinger (1879 pl. 1, fig. 3); middle Miocene, Badenian ( Langhian ). The specimen from Lăpugiu de Sus ( NHMW 1870 /0033/0002), mentioned by Hoernes & Auinger (1879) in their description of Conus tietzei , is most probably not conspecific with K. tietzei and may represent a juvenile M. hoernesi .

Studied material. Syntype.

Illustrated material. Figs 13 G1–G5, 3S: sytype, Szob ( Hungary): SL: 62.1 mm, MD: 41.2 mm, NHMW 1847 / 0046/0004, illustrated in Hoernes & Auinger (1879 pl. 1, fig. 3).

Revised description. Moderately large shell with depressed spire; early spire coeloconoid, later spire nearly flat; spire whorls faintly concave; smooth except for delicate growth lines; irregular, impressed suture. Subsutural flexure of medium depth, moderately curved, strongly asymmetrical. Rounded but prominent shoulder with position of maximum diameter closely below shoulder. Last whorl straight-sided and conical, not constricted; broad, low spiral cords on base. Aperture moderately narrow, widening abapically into weakly recurved, short siphonal canal; siphonal fasciole weak, twisted, poorly demarcated from base and inner lip. Colour pattern consisting of narrowly spaced spiral dashes.

Shell measurements and ratios. Only one syntype is available: SL: 62.1 mm, MD: 41.2 mm, spire angle: 141° (without coeloconoid early spire), last whorl angle: 41°, LW: 1.51, RD: 0.72, PMD: 0.85, RSH: 0.08.

Discussion. Kalloconus hungaricus ( Hoernes & Auinger, 1879) is very similar in colour-pattern and general shape to K. tietzei , which could be considered simply a more slender morphotype of K. hungaricus . However, the coeloconoid profile of the early spire, the better-defined shoulder, the narrower last spire whorl and the narrower angle of the last whorl seem to justify the separation.

A rare species, which is at first sight also similar to several Paratethyan Monteiroconus species, but can but can be separated from these by the absence of spiral sculpture on the spire whorls. The only Monteiroconus species with smooth spire whorls is M. boeckhi (Halaváts, 1884) , which can be immediately separated by its rather odd profile, constricted both just below the shoulder and the base and by its more twisted and slightly longer siphonal canal. Among the specimens from Letkés described by Kovács & Vicián (2013) the specimen illustrated as fig. 93 might represent K. tietzei , although it is slightly ventricose and its shoulder is slightly more rounded. The other specimens (figs. 92, 94) are distinctly smaller and more slender. Specimens of this species from Letkés in the collections of the NHMW have striate spire whorls, a broad last spire whorl and a densely spaced spiral colour pattern of delicate dashes, thus differing from K. tietzei and are described herein as Kalloconus letkesensis nov. sp.

Paleoenvironment. The mollusc fauna and lithofacies of Szob suggest a sandy coastal environment with sea grass ( Dulai 1996).

Distribution in Paratethys. Badenian (middle Miocene): Pannonian Basin: Letkés, Szob, Diósd, Kemence ( Hungary) ( Csepreghy-Meznerics 1956; Kovács & Vicián 2013); southern Pannonian Basin: Miljevići ( Bosnia and Herzegovina) ( Atanacković 1985).

Figures

FIGURE 13 A 1 – A 5. Kalloconus ponderovagus (Sacco, 1893), Niederkreuzstetten (Austria), NHMW 1849 / 0004 / 0016, holotype. 13 B 1 – B 3. Niederkreuzstetten (Austria), NHMW A 991. 13 C 1 – C 4. Kalloconus pseudohungaricus nov. sp., Lăpugiu de Sus (Romania), NHMW 1868 / 0001 / 0380 a, paratype. 13 D. Lăpugiu de Sus (Romania), Kalloconus pseudohungaricus nov. sp., NHMW 1868 / 0001 / 0380 d, paratype. 13 E 1 – E 3. Kalloconus pseudohungaricus nov. sp., Lăpugiu de Sus (Romania), NHMW 1868 / 0001 / 0380 b, holotype. 13 F 1 – F 2. Lăpugiu de Sus (Romania), Kalloconus pseudohungaricus nov. sp., NHMW 1868 / 0001 / 0380 c, paratype. 13 G 1 – G 5. Kalloconus tietzei (Hoernes & Auinger, 1879), NHMW 1847 / 0046 / 0004, Szob (Hungary), holotype.