Mazescala alata, 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-FFBF-FFBE-FF3F-FEF3FE3D90CD |
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treatment provided by |
Plazi |
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scientific name |
Mazescala alata |
| status |
sp. nov. |
Mazescala alata sp. nov.
Figs 33A View FIGURE 33 , 34A–B View FIGURE 34 2 View FIGURE 2
Type material. Holotype, NHMW 1865 View Materials /0001/0841, SL: 5.5 mm, MD: 2.1 mm, Vienna / Grinzing ( Austria), Figs 34B View FIGURE 34 1 –B View FIGURE 1 2 View FIGURE 2 . Paratype, NHMW 1866 View Materials /0001/0717, SL: 3.5 mm , MD: 1.6 mm, Möllersdorf ( Austria), Figs 33A View FIGURE 33 , 34A View FIGURE 34 1 – A View FIGURE 1 2 View FIGURE 2 .
Type locality. Vienna / Grinzing ( Austria), Vienna Basin .
Type stratum. Baden Formation.
Age. Middle Miocene, Badenian (Langhian).
Etymology. Referring to the slightly alate varices.
Diagnosis. Small, moderately slender shell with concave subsutural ramp and angled periphery placed above mid-whorl, deeply impressed suture, numerous, close-set, thin, strongly raised, weakly prosocline lamellae, obliquely aligned axially, broad low, trigonal spines along shoulder.
Description. Shell small, moderately slender (apical angle ~25–27°), faintly coronate. Protoconch unknown. Teleoconch whorls with weakly concave subsutural ramp and rounded angulation at periphery placed just above mid-whorl. Suture deeply impressed, linear. Early teleoconch whorls with weak, thin axial ribs, becoming successively more prominent. Later whorls with numerous, close-set, thin, strongly raised, weakly prosocline lamellae, obliquely aligned axially (~18: ~20: ~20); crests of lamellae faintly rolled over. Broad low, trigonal spines along shoulder of some lamellae. Interspaces smooth, glossy. Last whorl with relatively broad, weakly concave subsutural ramp and slightly angled periphery, attaining about 45% of total height, lamellae persisting on base, strongly rolled over, weak basal angulation, no distinct peribasal cord, moderately broad, flat to weakly concave base. Aperture ovate, columella weakly concave. Outer lip thickened by varix with shoulder-spine. Columellar callus forming narrow rim. No umbilicus.
Discussion. Mazescala alata sp. nov. is highly reminiscent of Mazescala kostejana ( Boettger, 1902) in size and outline but differs in its much higher lamellae, whereas M. kostejana has much lower, slightly frondose lamellae. Mazescala kostejana develops small, delicate, subtrigonal spines along the shoulder whereas M. alata has much broader and larger wing-like spines. In addition, it lacks spiral sculpture and has a wide base. Mazescala alata is a look-alike of the extant Australian Mazescala bellicosa ( Hedley, 1907) , which is nearly identical in size (SL: 7.5 mm), sculpture and general outline and differs only in its fewer lamellae (see Hedley 1907: pl. 67, fig. 18; Iredale 1936: pl. 22, fig. 4). Mazescala thrasys Iredale, 1936 , from Austria, is larger at same number of whorls (SL: 15.5 mm) and slenderer (see Iredale 1936: pl. 22, fig. 2). The Japanese Mazescala sakuraii (Kuroda & Habe, 1961) has many more lamellae ( Weil et al. 1999: fig. 377) and Mazescala sawamurai ( Azuma, 1960) is slenderer and has weaker angled whorls ( Weil et al. 1999: fig. 378). The Plio-Pleistocene Mazescala salicensis ( Seguenza 1876) is much larger with more numerous whorls and frondose lamellae (see Landau et al. 2006: pl. 11, fig. 4).
Paleoenvironment. Occurrences in the Baden Formation of the Vienna Basin suggest middle to outer neritic settings in up to 250 m water depth ( Kranner et al. 2021). Mazescala salicensis ( Seguenza 1876) is also found in deeper water deposits, indicating at least 200 m water depth (own data B.L.).
Distribution in Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Vienna /Grinzing, Möllersdorf ( Austria) (hoc opus).
| MD |
Museum Donaueschingen |
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