Crenilabium reussi
Year: 2026
Type: article
Abstract: Crenilabium reussi (Boettger, 1902) Figs 9A–C * Actaeon reussi n. sp. — Boettger 1902: 175. Actaeon reussi Bttgr.—Boettger 1907: 202. Actaeon reussi Boettger— Zilch 1934: 276, pl. 22, fig. 12. Acteon semistriatus Férussac var. burdigalensis d’Orbigny — Kecskeméti-Körmendy 1962: 93, pl. 11, fig. 9 [non Acteon burdigalensis (d’Orbigny, 1852) = Acteon semistriatus Férussac, 1822)]. Acteon reussi Boettger, 1904 — Katona et al. 2011: 9, pl. 2, fig. 7. Acteon laevigatus Grateloup, 1827 — Katona et al. 2011: 9, pl. 2, fig. 8 [non Acteon laevigatus (Grateloup, 1828)]. Type material. Lectotype (designated by Zilch 1934: 276), SMF 363156 - 12.2545a (glass plate 393), SL: 5.8 mm, MD: 2.3 mm, Coșteiu de Sus (Romania), illustrated in Zilch (1934: pl. 22, fig. 12). The specimen was destroyed during WWII, Fig. 9A. Illustrated material. NHMW 2020/0004/1666, SL: 4.8 mm, SL: 1.9 mm, Bad Vöslau (Austria), Figs 9B 1 –B 2. NHMW 2020/0004/1666a, SL: 4.7 mm, SL: 2.1 mm, Bad Vöslau (Austria), Figs 9C 1 –C 2. Revised description. Shell small, slender (SL/MD = 2.4–2.5), with high spire and broad apex (MD/ApD = 1.3). Protoconch strongly tilted, of about one smooth, convex whorl. Teleoconch of up to four whorls separated by narrow, deeply impressed, linear suture. Spire whorls weakly convex, glossy with periphery just above abapical suture, apical angle 38–42°. Sculpture of hardly visible spiral cords. Last whorl 71–74% of total height, weakly convex, elongate ovate, glossy, with periphery placed mid-whorl (SL/ PH = 1.9–2.0). Sculpture of faint spiral grooves strengthening and weakly punctate on base. Aperture 54–57% of total height, moderately narrow (MD/MAW = 2.4–2.7); outer lip thin, weakly convex. Basal lip strongly rounded. Columella weakly thickened, with a single moderately strong fold. Columellar callus below columellar fold forming narrow, adherent rim; columellar callus above fold forming thin sheet. No parietal callus. Discussion. This species is unique within the Paratethyan Acteonidae due to its slender, glossy shell. We place it in Crenilabium Cossmann, 1889 based on its general shape. Especially the extant Crenilabium birmani Simone, 2006 from Brazil is exceptional similar to the Paratethyan species in shape, sculpture and protoconch features but differs in its higher spire (see Simone 2006: figs 5–9). The extant Mediterranean Crenilabium exile (Jeffreys, 1870) is also highly reminiscent of Crenilabium reussi (Boettger, 1902). The main difference is that Crenilabium exile attains twice the maximum size at the same number of whorls (see Landau et al. 2023: pl. 23). Crenilabium pedemontanum (Sacco, 1897), from the Middle Miocene of the Colli Torinesi (Italy) is even more slender, with a higher spire (see Sacco 1897: pl. 3, fig. 50; Ferrero Mortara et al. 1984: pl. 52, fig. 4). Similarly, Crenilabium dargelasi (de Basterot, 1825), from the Burdigalian of France, is slenderer and has a higher spire (see Peyrot 1932: pl. 11, figs 40–41). Paleoenvironment. The occurrence at Várpalota (Hungary) suggests agitated, shallow marine environments (own data, M.H.). Distribution in Central Paratethys. Badenian (Middle Miocene): Pannonian Basin: Várpalota (Hungary) (Katona et al. 2011); Făget Basin: Coşteiu de Sus (Romania) (Boettger 1902).
Subfield: Insect Science
Domain: Life Sciences
Open Access status: gold
OpenAlex ID: W7163015162
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