Acteon semistriatus

Abstract

Acteon semistriatus (Férussac, 1822) Figs 5A–C * [Tornatella] semistriata Defrance— Férussac 1822, p. 108. [Actaeon] Burdigalensis d’Orb. —d’Orbigny 1852: 35, no. 519 [nom. nov. pro Tornatella semistriata Férussac, 1822 (pars)]. Tornatella semistriata Defr.— Hörnes 1848: 22. Actaeon semistriatus Fèr [sic]— Sacco 1897: 33, pl. 3, figs 21–23. Actaeon semistriatus var. fusulatior Sacc.— Sacco 1897: 33, pl. 3, figs 24, 25. Actaeon semistriatus var. maculata (Bors.) — Sacco 1897: 34, pl. 3, figs 26, 26bis. Actaeon semistriatus var. ligustica Sacc.— Sacco 1897: 34, pl. 3, figs 27–28. Actaeon semistriatus var. perstriata Sacc.— Sacco 1897: 34, pl. 3, fig. 29. Actaeon semistriatus var. totostriata Sacc.— Sacco 1897: 34, pl. 3, figs 30–31. Actaeon semistriatus Fer.— Friedberg 1928: 538, pl. 35, fig. 10. Actaeon semistriatus var. burdigalensis d’Orbigny— Peyrot 1932: 156, pl. 11, fig. 36. Actaeon semistriatus burdigalensis d’Orbigny— Glibert 1952a: 384, pl. 13, fig. 7. Actaeon semistriatus Férussac— Glibert 1952b: 139, pl. 10, fig. 10. Actaeon semistriatus Fér. — Csepreghy-Meznerics 1954: 58. Actaeon semistriatus Fér.— Strausz 1954: 38 (pars). A [ctaeon]. semistriatus Fér.— Sieber 1958: 162. Acteon (Acteon) semistriatus (Ferussac 1822) —Kojumdgieva in Kojumdgieva & Strachimirov 1960: 219, pl. 52, fig. 3. Actaeon semistriatus (Férussac) — Răileanu & Negulescu 1964: 180, pl. 16, fig. 5. Acteon semistriatus Férussac, 1822 — Strausz 1966: 467, text-fig. 209. Acteon semistriatus Férussac— Zelinskaya et al. 1968: 232, pl. 52, figs 11–12. Acteon (Acteon) semistriatus (Férussac, 1822) — Atanacković 1969: 216, pl. 14, fig. 3. Acteon semistriatus burdigalensis d’Orbigny— Steininger 1973: 448, pl. 9, fig. 7. Acteon (Acteon) semistriatus (Férussac, 1822) — Atanacković 1985: 185, pl. 41, figs 11–12. ? Actaeon semistriatus burdigalensis d’Orbigny, 1852 —Harzhauser 2002: 125: pl. 12, fig. 10. Acteon semistriatus (Férussac, 1822) — Chirli 2013: 22, pl. 7, figs 7–12. ‘ Acteon ’ semistriatus (Férussac, 1822) — Landau et al. 2013: 323, pl. 52, fig. 13. ‘ Acteon ’ semistriatus (Férussac, 1822) — Ceulemans et al. 2018: 112, pl. 7, fig. 1. Acteon semistriatus (Férussac, 1822) — Brunetti 2022: 78, fig. 183. Acteon semistriatus (Férussac, 1822) — Landau et al. 2023: 364, pl. 20, figs 1–3 [cum syn]. non 1954 Actaeon semistriatus Fér.—Strausz, p. 38, 73, 115, pl. 5, fig. 114 [? = Melanopsis sp.]. non Acteon semistriatus Férussac var. burdigalensis d’Orbigny—Kecskemétiné Körmendy 1962: 93, pl. 11, fig. 9 [= Crenilabium reussi (Boettger, 1902)]. non Acteon (Acteon) semistriatus Ferr.—Rado & Muţui 1970: 148, pl. 6, fig. 32 [= Acteon laevigatus (Grateloup, 1828)]. Type material. We are not aware of the whereabouts of the type material. Illustrated material. NHMW 2018/0248/0484, SL: 6.0 mm, MD: 2.9 mm, Coşteiu de Sus (Romania), Figs 5A 1 –A 2. NHMW2018/0248/0484a, SL: 6.0 mm, MD: 2.9 mm, Coşteiu de Sus (Romania), Figs 5B 1 –B 2.NHMW 1859/0038/0121, SL: 12.8 mm, MD: 5.5 mm, Grund (Austria), Figs 5C 1 –C 2. Revised description. Shell large, moderately slender (SL/MD = 2.3), with moderately high spire and broad apex (MD/ApD = 1.3). Protoconch depressed of one smooth whorl. Teleoconch of up to five whorls separated by narrowly canaliculate, linear suture. Spire whorls suture, nearly straight sided, with periphery at abapical suture, apical angle 59°. Last whorl 78% of total height, ovate with weak, shoulder, weakly concave above, weakly convex below, with periphery just above mid-whorl (SL/ PH = 1.9). Base moderately constricted. Sculpture of last whorl of prominent, bifid spiral cords on base, separated by narrow, weakly punctate grooves. Spiral cords rapidly weakening adapically; last whorl smooth above.Aperture 62% of total height, moderately wide (MD/MAW = 2.6); outer lip not preserved; basal lip strongly rounded, slightly flaring. Columella weakly thickened, slightly erect abapically, with a single strong fold. Columellar callus below columellar fold forming broad, detached rim; columellar callus above columellar fold forming thin, sheet. Parietal callus not developed. Discussion. For descriptions of Pliocene specimens and for a discussion on the variability of this species see Landau et al. (2023: 365). This species is extraordinarily variable in shape and sculpture and might represent an unresolved species complex. We include here also two specimens with up to three punctate spiral grooves below the adapical suture, delimiting broad, flattened spiral cords (Figs 3A–B). These shells seem to represent juvenile specimens. Paleoenvironment. Shallow marine, inner neritic (Harzhauser 2002; Landau et al. 2023: 365) Distribution in Central Paratethys. Eggenburgian (Early Miocene): Petroşeni Basin: Sălătruc (Romania) (Răileanu & Negulescu 1964). Karpatian (Early Miocene): Pannonian Basin: Várpalota (Hungary) (Steininger 1973);? Korneuburg Basin: Stetten (Austria) (Harzhauser 2002). Badenian (Middle Miocene): Korytnica Basin: Korytnica (Poland) (Friedberg 1928); Polish-Ukrainian Fore-Carpathian Basin: Zboriv (Ukraine) (Friedberg 1928); North Alpine-Carpathian Foreland Basin: Grund (Austria) (hoc opus); Pannonian Basin: Szob, Várpalota (Hungary) (Strausz 1966); Southern Pannonian Basin: Miljevići (Bosnia and Herzegovina) (Atanacković 1985); Dacian Basin: Dobrusha, Opanets (Bulgaria) (Kojumdgieva in Kojumdgieva & Strachimirov 1960); Făget Basin: Coşteiu de Sus (Romania) (hoc opus). Proto-Mediterranean Sea. Burdigalian (Early Miocene): Colli Torinesi (Italy) (Sacco 1897). Serravallian (Middle Miocene): Karaman Basin: Akpınar, Lale, Seyithasan (Turkey) (Landau et al. 2013); Tortonian (Late Miocene): Po Basin (Italy) (Sacco 1897). Pliocene: Italy, Spain, France, Tunisia (see Landau et al. 2023 for details). Northeastern Atlantic. Aquitanian and Burdigalian (Early Miocene): Aquitaine Basin (France) (Peyrot 1932); Langhian and Serravallian (Middle Miocene): Aquitaine Basin (France) (Peyrot 1932); Langhian (Middle Miocene): Loire Basin (France) (Glibert 1952a); Tortonian and Messinian (Late Miocene): France (Landau et al. 2020), Algarve Basin (Portugal) (Dollfus et al. 1903); Pliocene: France, Spain (see Landau et al. 2023 for details). North Sea. Burdigalian/Langhian (Middle Miocene): North Sea Basin: Belgium (Glibert 1952b), Denmark (Sorgenfrei 1958), Germany (Anderson 1964; Wienrich 2007), The Netherlands (A.W. Janssen 1984); Tortonian (Late Miocene): Denmark (Schnetler 2005).

Authors 3

1. Mathias Harzhauser

   Natural History Museum Vienna

   Affiliation as printed

   Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria mathias. harzhauser @ nhm. at; https: // orcid. org / 0000 - 0002 - 4471 - 6655

2. Bernard Landau Aachen

   University of Lisbon · Instituto Dom Luiz · Naturalis Biodiversity Center

   Affiliation as printed

   Naturalis Biodiversity Center, P. O. Box 9517, 2300 RA Leiden, Netherlands; Instituto Dom Luiz da Universidade de Lisboa, Campo Grande, 1749 - 016 Lisboa, Portugal; and International Health Centres, Av. Infante de Henrique 7, Areias São João, P- 8200 Albufeira, Portugal bernardmlandau @ gmail. com; https: // orcid. org / 0000 - 0002 - 7768 - 8494

3. Manuel António E. Malaquias

   University of Bergen · Natural History Museum Vienna

   Affiliation as printed

   Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria mathias. harzhauser @ nhm. at; https: // orcid. org / 0000 - 0002 - 4471 - 6655 & Department of Natural History, University Museum of Bergen, University of Bergen, PB 7800, 5020 - Bergen, Norway manuel. malaquias @ uib. no; http: // orcid. org / 0000 - 0002 - 9668 - 945 X & Natural History Museum Vienna, Burgring 7, 1010 Vienna, Austria mathias. harzhauser @ nhm. at; https: // orcid. org / 0000 - 0002 - 4471 - 6655