Euthria viciani Kovács, 2018

Harzhauser, Mathias & Landau, Bernard M., 2024, The Colubrariidae, Eosiphonidae, Melongenidae, Pisaniidae, Prodotiidae and Tudiclidae (Gastropoda, Buccinoidea) of the Miocene Paratethys Sea, Zootaxa 5427 (1), pp. 1-110 : 88

Euthria viciani Kovács, 2018

Figs 46A–C

* Euthria viciani n. sp. — Kovács 2018: 179, figs 2–9.

Type material. Holotype: PAL 2018.1.1. HNHM, Department of Paleontology and Geology, SL: 51 mm, MD: 25 mm, illustrated in Kovács (2018: figs 2–3), Bánd ( Hungary), Figs 46A 1 –A 2 . Paratypes: PAL 2018.2.1 . HNHM, SL: 50 mm, MD: 27 mm, illustrated in Kovács (2018: figs 8–9), Bánd ( Hungary), Figs 46B 1 –B 2 . Coll . V.2017.02–03, Collection Vicián, SL: 44 mm, MD: 22 mm, illustrated in Kovács (2018: figs 4–5), Bánd ( Hungary), Fig. 46C .

Revised description. Medium-sized, moderately broad, ovate shell of up to seven teleoconch whorls with slightly coeloconoid early spire passing to cyrtoconoid on later whorls; apical angle ~60°. Protoconch paucispiral of 1.25 smooth whorls. First two teleoconch whorls weakly convex with weak axial ribs and delicate spiral cords. Later teleoconch whorls flat-sided, smooth, separated by indistinct suture. Last whorl smooth, ovate, broad, very high, attaining ~80% of total height, subsutural ramp slightly concave, hardly delimited, broadly convex below; base moderately constricted bearing weak spiral cords; fasciole slightly swollen. Aperture moderately small, ovate. Columella broadly and weakly excavated, weakly angled at transition to siphonal canal. Columellar callus extending as distinct rim along siphonal canal, weakly delimited from base in parietal area. Anal canal incised, accentuated by prominent parietal denticle. Indistinct swelling in area of anal denticle. Outer lip strongly thickened adapically, thinning below, with about ten short lirae starting some distance behind peristome. Siphonal canal moderately long, relatively wide, deflected to the left, shallowly notched. Color pattern of numerous bands of subquadrate brown and white blotches, resulting in a somewhat blurred, chessboard-like pattern.

Discussion. Euthria viciani is unique within the Circum-Mediterranean Euthria species, due to its peculiar color pattern and due to the change from coeloconoid to cyrtoconoid spire. Its shape is slightly reminiscent of Euthria fuscocingulatus (Hoernes & Auinger, 1890) and Euthria depressospira Bandat, 1943 , which both lack the concave subsutural ramp.

The extant Euthria cecilea Fraussen & Rolán, 2003 from the Cape Verde Islands, is reminiscent of E. viciani , but its blotches are less strictly subquadratic and its spire is more conical.

Paleoenvironment. The locality Bánd comprises an assemblage indicative for a shallow marine depositional environment (own data M.H.).

Distribution in Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Niederleis, Bad Vöslau ( Austria) (hoc opus); Pannonian Basin: Bánd ( Hungary) ( Kovács 2018).

Figures

FIGURE 1. Measurements for shell morphology; AA: apical angle, SL: shell length, MD: maximum diameter, LWH: last whorl height, AH: aperture height, AL: aperture length, AW: aperture width.

FIGURE 2. Colubraria subobscura (Hoernes & Auinger, 1884). A1–A3. NHMW 1854/0035/0170, paralectotype, Lăpugiu de Sus (Romania). B1–B2. NHMW 1859/0037/0018a, paralectotype, Lăpugiu de Sus (Romania). C1–C3. NHMW 1865/0001/0183, paralectotype, Lăpugiu de Sus (Romania). D1–D2. NHMW 1859/0037/0018b, paralectotype, Lăpugiu de Sus (Romania). E1–E3. NHMW 1874/0025/0021, lectotype, Lăpugiu de Sus (Romania). F1–F2. NHMW 2023/0338/0001, paralectotype, Lăpugiu de Sus (Romania).

FIGURE 46. Euthria viciani Kovács, 2018. A1–A2. PAL 2018.1.1. HNHM, holotype, Bánd, (Hungary). B1–B. PAL 2018.2.1. HNHM, paratype, Bánd (Hungary). C. Coll.V.2017.02–03, Collection Vicián, paratype, Bánd (Hungary). Euthria zachosi nov. sp. D1–D2. NHMW 2023/0350/0003, holotype, Bad Vöslau (Austria). E1–E2. NHMW 2023/0350/0003, paratype, Bad Vöslau (Austria). F. NHMW 2023/0347/0002, paratype, Niederleis (Austria).