Aneurystoma afenestrata ( Sacco, 1894 )

Harzhauser, Mathias & Landau, Bernard, 2012, A revision of the Neogene Cancellariid Gastropods of the Paratethys Sea 3472, Zootaxa 3472, pp. 1-71 : 17-18

Aneurystoma afenestrata ( Sacco, 1894)

Figs 3G, 4J 1–J 3

Cancellaria Dufouri Grat. —Hörnes 1854: 312, pl. 34, figs 9a–b [non Cancellaria Dufourii Grateloup, 1832 ].

Cancellaria (a. Merica ) Dufouri Grat.— Hoernes & Auinger 1890: 281 [non Cancellaria Dufourii Grateloup, 1832 ].

Aphera bronni var. afenestrata Sacco 1894: 67 .

Cancellaria (Aphera) bronni Bell. — Sieber 1936: 100 [non Cancellaria Bronni Bellardi, 1841 ].

Narona (Aneurystoma) austropolonica Bałuk 1997: 51 , pl. 17, figs 3–4.

Narona (Aneurystoma) austropolonica Bałuk, 1997 — Harzhauser 2002: 110, pl. 9, figs 1–2.

Aneurystoma afenestrata ( Sacco, 1894) — Bałuk 2006: 213.

Type material. NHM Vienna ( Austria); see below for details .

Studied material. 2 spec. Grund ( Austria) NHMW 2009 z0098/0010, NHMW 1855 /0045/1732; 2 spec. Weinsteig ( Austria) NHMW 1847 /0037/0016).

Illustrated material. Fig. 3G: Grund ( Austria), height: 21.8 mm, width: 12.5 mm, NHMW 1855 /0045/0732, syntype . Figs 4J 1–J 3: specimen illustrated in Hörnes (1854, pl. 34, figs 9a–b), Grund ( Austria), height: 24.9 mm, width: 13.7 mm, NHMW 2009 z0098/0010 (= holotype of Narona (Aneurystoma) austropolonica Bałuk, 1997 ), syntype .

Discussion. Bałuk (1997) introduced the new name Narona (Aneurystoma) austropolonica for the specimen illustrated as figs 9a–b in Hörnes (1854, pl. 34). Unfortunately, Bałuk (1997) overlooked that Sacco (1894) had already proposed the name afenestrata for this very specimen. Later, Bałuk (2006) followed Petit and Harasewych (2005) and rejected austropolonica as junior synonym.

The separation of Aneurystoma afenestrata from the Burdigalian–Langhian A. dufourii ( Grateloup, 1832) is based on the completely different sculpture, which consists of prominent primary and secondary spiral ribs, which are incised by much weaker, sigmoidal growth lines. In contrast, A. dufourii develops a cancellate pattern of narrow axial ribs and spiral cords of equal strength (cf. Cahuzac et al. 2004). Aneurystoma afenestrata differs from the superficially similar Perplicaria mioquadrata ( Sacco, 1894) in its distinctly less elongate shell and the lower and much wider aperture. Moreover, its high protoconch with its large nucleus differs completely from the trochiform multispiral protoconch of Perplicaria mioquadrata .

Distribution. This rare species appears during the late Early Miocene in the Paratethys and is spread during the early Middle Miocene from the North Alpine Foreland Basin to the Polish–Carpathian Foredeep. It disappears already with the end of the early Badenian (= Langhian).

Paratethys —Karpatian (= Late Burdigalian): Korneuburg Basin ( Austria: Kleinebersdorf, Weinsteig); Badenian: Polish–Carpathian Foredeep ( Poland, Korytnica), North Alpine Foreland Basin ( Austria: Grund).