Acirsa fusiformis, Harzhauser & Landau, 2025
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publication ID |
https://doi.org/10.11646/zootaxa.5630.1.1 |
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publication LSID |
lsid:zoobank.org:pub:89462472-D932-4255-880F-C6EF15220A31 |
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persistent identifier |
https://treatment.plazi.org/id/03D787A4-FFF5-FFF5-FF3F-FB86FC9392B8 |
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treatment provided by |
Plazi |
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scientific name |
Acirsa fusiformis |
| status |
sp. nov. |
Acirsa fusiformis sp. nov.
Figs 4E View FIGURE 4 , 6A–B View FIGURE 6 , 7E, I View FIGURE 7
Type material. Holotype, NHMW 1873 View Materials /0026/0043, SL: 19.3 mm, MD: 7.3 mm, Lăpugiu de Sus ( Romania), Figs 4E View FIGURE 4 , 6A View FIGURE 6 1 –A View FIGURE 1 2 View FIGURE 2 . Paratypes, NHMW 1873 View Materials /0026/0043a, SL: 14.4 mm , MD: 5.0 mm, Lăpugiu de Sus ( Romania), Fig. 6B View FIGURE 6 . NHMW 1873 View Materials /0026/0043b, SL: 15.9 mm , MD: 5.6 mm, Lăpugiu de Sus ( Romania), Fig. 7I View FIGURE 7 .
Type locality. Lăpugiu de Sus ( Romania), Făget Basin .
Type stratum. Silt and clay of the Dej Formation.
Age. Middle Miocene, Badenian (Langhian).
Etymology. Referring to the fusiform shape.
Diagnosis. Medium-sized, moderately slender fusiform shell with elevated protoconch with conical outline of five convex whorls with deep suture and strongly teleoconch convex whorls with sigmoidal-opisthocyrt axial ribs overrun by numerous prominent, narrow spiral cords separated by narrow grooves; cords on last whorl subobsolete mid-whorl.
Description. Shell medium-sized, moderately slender fusiform,rather thin-shelled (apical angle23°). Protoconch multispiral, highly elevated, of five strongly convex whorls with small, pointed nucleus. Last two whorls with faint mid-whorl angulation, slightly constricted below, with some sinuous axial riblets on the last quarter whorl. Teleoconch of seven strongly convex whorls with deeply impressed, linear suture. First teleoconch whorl with about eight narrow spiral cords separated by wider interspaces crossing narrow, widely spaced, orthocline axial ribs. Axial ribs strengthening on later whorls, forming prominent, convex, sigmoidal to opisthocyrt ribs, separated by wider interspaces (20: 17: 20). Spiral cords increasing in number by intercalations of secondary cords (about 15 spiral cords on penultimate whorl), overrunning ribs and forming delicate nodes at intersections. Spiral cords subobsolete mid last whorl. Last whorl attaining about 42% of total height. Rounded transition into moderately constricted base bearing about 12 prominent spiral cords. Aperture partly missing; ovate, columella weakly concave. Columellar callus forming thin, adherent rim, no parietal callus.
Discussion. Acirsa exvaricula Sacco, 1891 , from the Tortonian of S. Agata ( Italy), differs in its slenderer shape, less convex whorls and straight, weakly prosocline axial ribs (see Sacco 1891: pl. 2, fig. 102). Acirsa miopedemontana Sacco, 1891 , from the Burdigalian of Baldissero ( Italy), has comparable outline with strongly convex whorls but lacks prominent axial ribs ( Sacco 1891: pl. 2, fig. 103).
Paleoenvironment. Unknown.
Distribution in Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Bad Vöslau ( Austria) (hoc opus); Făget Basin: Lăpugiu de Sus ( Romania) (hoc opus).
| MD |
Museum Donaueschingen |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.