Volvulella acuminata

Abstract

Volvulella acuminata (Bruguière, 1792) Figs 33A–C * Bulla acuminata Nob.—Bruguière 1792: 376. Volvula acuminata (Brug.) — Sacco 1897: 42, pl. 3, figs 91–93. Volvula acuminata (Brug.) — Boettger 1902: 176. Volvula acuta Grat. — Csepreghy-Meznerics 1952: 228, pl. 14, figs 18–22 [non Volvulella acuta (Grateloup, 1827)]. Volvula acuminata (Bruguiere) — Berger 1953: 103, pl. 17, figs 52–53. V [olvula]. acuminata (Brug.) — Sieber 1958: 163. Rhizorus acuminatus Bruguiere, 1792 — Strausz 1962: 155, text-fig. 174, pl. 75, figs 5–6. Rhizorus acuminatus Bruguière, 1792 — Strausz 1966: 476, text-fig. 213, pl. 75, figs 5–6. Volvulella acuminata (Bruguière, 1792) — Gofas et al. 2011: 406, unnumbered fig. bottom. Volvulella acuminata (Bruguière, 1792) — Chirli 2013: 56, pl. 12, figs 18–23. Volvulella acuminata (Bruguière, 1792) — Landau et al. 2013: 339, pl. 78, fig. 2. Volvulella acuminata (Bruguière, 1792) — Ceulemans et al. 2018: 119, pl. 7, fig. 10. Volvulella acuminata (Bruguière, 1792) — Landau et al. 2023: 386, pl. 36, figs 1–3 (cum syn.). For references from the North Sea, the northeastern Atlantic and the Mediterranean Sea see Landau et al. (2013, 2023). Type material. We are not aware of the whereabouts of the type specimens. Illustrated material. NHMW 2010/0004/1651, SL: 4.0 mm, MD: 1.5 mm, Bad Vöslau (Austria), Figs 33A 1 – A 2. NHMW 1876/0011/0171, SL: 2.9 mm, MD: 1.1 mm, Lăpugiu de Sus (Romania), Figs 33B 1 –B 2. NHMW 2010/0004/1652, SL: 3.3 mm, MD: 1.4 mm, Bad Vöslau (Austria), Figs 33C 1 –C 2. Revised description. See Landau et al. (2023: 387). Discussion. As discussed by Landau et al. (2013: 340), Volvulella acuminata (Bruguière, 1792) is either a species complex or an unusually long-lived and widely distributed species. We note that Paratethyan specimens at hand have the periphery above mid-whorl (SL/ PH = 1.7) with slightly contracting sides below the periphery, whereas typical shells of V. acuminata tend to be roughly subcylindrical (e.g., Chirli 2013: pl. 12, figs 18–23; Landau et al. 2023: pl. 36, figs 1–3). The Paratethyan morph is reminiscent of the extant Volvulella fortis (Thiele, 1925) from New Caledonia (See Valdés 2008: fig. 81C). Specimens described by Csepreghy-Meznerics (1952) from Szob (Hungary) correspond to the subcylindrical morph typical for V. acuminata. Tentatively, we treat slender and stout morphs as conspecific. Paleoenvironment. Volvulella acuminata is found circalittoral muddy sands (Gofas et al. 2011). Paratethyan occurrences derive from inner neritic and middle neritic settings. Many extant Volvulella species are documented from deep water habitats (Valdés 2008). Distribution in Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Bad Vöslau (Austria) (Berger 1953); Pannonian Basin: Szob (Hungary) (Strausz 1966). Făget Basin: Coşteiu de Sus, Lăpugiu de Sus (Romania) (Boettger 1907; hoc opus). Distribution. The status of the various Early Miocene to Pleistocene records in the Mediterranean region, the north-eastern Atlantic and North Sea might need revision. For details on the distribution see Landau et al. (2013, 2020, 2023). Volvulella acuminata occurs in the Atlantic from Norway (Thompson 1988) to Angola (Nicklès 1950) and in the entire Mediterranean Sea (Cossignani & Ardovini, 2011; Gofas et al. 2011).

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