Euthria zachosi, Harzhauser & Landau, 2024

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 : 89-90

Euthria zachosi nov. sp.

Figs 46D–F

Type material. Holotype: NHMW 2023 /0350/0003, SL: 38.1 mm, MD: 19.3 mm, Bad Vöslau ( Austria), Figs 46D 1 –D 2 . Paratypes: NHMW 2023 /0350/0003, SL: 39.7 mm , MD: 19.9 mm, Bad Vöslau ( Austria), Figs 46E 1 –E 2 . NHMW 2023 /0347/0002, SL: 38.3 mm , MD: 19.6 mm, Niederleis ( Austria), Fig. 46F .

Type locality. Bad Vöslau ( Austria), Vienna Basin .

Type stratum. Baden Formation.

Age. Middle Miocene, middle Badenian (Langhian).

Etymology. In honor of Franz Zachos, zoologist at the NHMW.

Diagnosis. Medium-sized, moderately broad, ovate shell with slightly coeloconoid early spire passing to cyrtoconoid on later whorls. Anal canal incised with broad, not very parietal denticle; indistinct swelling in area of anal denticle. Outer lip strongly thickened with about eight long lirae.

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 unknown. First two teleoconch whorls 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 distinct spiral cords; fasciole slightly swollen.Aperture moderately small, ovate. Columella broadly and weakly excavated, weakly angled at transition to siphonal canal. Columellar callus weakly delimited. Anal canal incised, accentuated by broad, not very parietal denticle. Indistinct swelling in area of anal denticle. Outer lip strongly thickened adapically, thinning below, with about eight long lirae starting some distance behind peristome. Siphonal canal moderately long, relatively wide, deflected to the left, shallowly notched.

Discussion. The specimens are smaller than Euthria viciani Kovács, 2018 and lack the typical color pattern. In addition, the adapical part of the siphonal canal is wider in Euthria zachosi but subparallel in Euthria viciani . The base and siphonal canal are sculptured with broad, but low, spiral cords whereas Euthria viciani has a smooth and glossy base. Lirae in Euthria viciani are short but reach far into aperture in Euthria zachosi .

Paleoenvironment. The occurrences in the Baden Formation of the Vienna Basin suggest middle to outer neritic environments in up to 250 m water depth ( Kranner et al. 2021).

Distribution in Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Niederleis, Bad Vöslau ( Austria).

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).