Pseudofusus balteus, Harzhauser & Landau & Vermeij, 2024
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publication ID |
https://doi.org/ 10.11646/zootaxa.5470.1.1 |
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publication LSID |
lsid:zoobank.org:pub:6A4270C2-D3F9-404F-91E7-4A73F2A99AE4 |
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persistent identifier |
https://treatment.plazi.org/id/36508782-FFF2-DB1C-3288-70B90BDEFAD9 |
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treatment provided by |
Plazi |
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scientific name |
Pseudofusus balteus |
| status |
sp. nov. |
Pseudofusus balteus nov. sp.
Figs 2O View FIGURE 2 , 21A View FIGURE 21
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–A
View FIGURE 1Aptyxis omphale ( Millet, 1864) View in CoL — Kovács & Vicián 2023: 233, figs 6C–E [non Pseudofusus omphalis ( Millet, 1864) ].
Type material. Holotype: NHMW 2023 View Materials /0370/0001 (ex coll. Zoltán Kovács), SL: 17.2 mm, MD: 7.9 mm, Letkés ( Hungary), illustrated in Kovács & Vicián (2023: figs 6C–E), Figs 2O View FIGURE 2 , 21A View FIGURE 21 1 –A View FIGURE 1 2 View FIGURE 2 .
Type stratum. Fossil-rich marly sand with coral blocks and andesite boulders of the Sámsonháza Formation ( Császár 1997).
Type locality. Letkés at the western part of the Börzsöny Mts. ( Hungary); see Kovács & Vicián (2014) for a map and description .
Age. Middle Miocene, early Badenian (= Langhian).
Etymology. balteus, Latin for belt, referring to the broad spiral cords.
Diagnosis. Small, moderately slender fusiform shell with moderately convex whorls, weak shoulder angulation and broad subsutural ramp, sculpture of broad primary and weaker secondary spiral cords overriding broad axial ribs, two spiral cords along periphery most prominent, slightly swollen over axial ribs, columella smooth, inner lip with numerous delicate lirae.
Description. Small, moderately slender fusiform shell of six teleoconch whorls; apical angle 46°. Protoconch paucispiral, conical of 1.5 moderately convex whorls, diameter 900 μm, height 800 μm. Early teleoconch whorls convex, weakly shouldered mid-whorl, with weak subsutural cord and two prominent, close-set spiral cords overrunning wide-spaced prominent axial ribs, forming bead-like swellings over ribs. Later teleoconch whorls with narrow subsutural collar, broad, faintly concave subsutural ramp and convex periphery. Suture deeply incised, shallowly undulating. Axial ribs confined to periphery, weakening over subsutural ramp. Spiral sculpture of bifid subsutural cord, one weaker primary cord adjoined by two secondary cords on subsutural ramp and two prominent cords along periphery: primary cords swollen over ribs.Last whorl attaining 65% of total height, with broad subsutural ramp, roundly shouldered, convex below, strongly constricted at convex base, bearing numerous cords of alternating strength; fasciole indistinct. Aperture moderately wide, pyriform. Columellar callus forming narrow, adherent rim. Columella broadly and moderately excavated, smooth, twisted at transition to siphonal canal. Anal canal weakly incised with faint parietal denticle. Outer lip thin, slightly flared, with numerous delicate lirae extending deep within aperture. Siphonal canal moderately long, moderately narrow, only slightly deflected to the left.
Discussion. This species was identified by Kovács & Vicián (2023) as the northeastern Atlantic Middle Miocene to Pliocene Pseudofusus omphalis ( Millet, 1864) . Despite the similarities in general shape, Pseudofusus balteus nov. sp. differs from Pseudofusus omphalis in its slenderer outline, the steeper subsutural ramp, and the narrower spiral cords (see Van Dingenen et al. 2017: pl. 2 fig. 4; Landau et al. 2019: p. 172, pl. 35, figs 1–8). In addition, P. omphalis has a paucispiral protoconch with a large, bulbous first whorl and prominent axial ribs close to the transition of the teleoconch ( Landau et al. 2019: pl. 35, fig. 6b), whereas P. balteus has a low conical protoconch without axial ribs ( Kovács & Vicián 2023: fig. 6E). We note that both species have a thin, slightly flaring outer lip (see Landau et al. 2019: pl. 35, fig. 7).
Within the extant Mediterranean Pseudofusus species, the relatively short siphonal canal of P. balteus is reminiscent of Pseudofusus parvulus Monterosato, 1884 , which has more convex whorls and broader axial ribs. Pseudofusus buzzurroi ( Prkić & Russo, 2008) differs in its more strongly shouldered whorls and narrower spiral cords. Comparably broad spiral cords are seen in Pseudofusus alternatus ( Buzzurro & Russo, 2007) , which has more prominent axial ribs extending between the sutures and strongly developed on all whorls.
Fusus omphale Millet, 1864 , was placed in Aptyxis Troschel, 1868 by Van Dingenen et al. (2017) and Landau et al. (2019) following Peyrot (1938), who described the same species as Fusus ( Aptixis [sic]) rostratus var. ligeriana . The monotypic genus Aptyxis [type species Murex syracusanus Linnaeus, 1758 , by monotypy (Troschel 1868: 61, 64); present-day, Mediterranean Sea] has a smooth, nearly flat-sided subsutural ramp, sharply angled shoulder and very regular, orthocline axial ribs weakening on subsutural ramp. The teleoconch whorls are subcylindrical below the shoulder and it has a comparatively higher spire than the northeastern Atlantic Pseudofusus omphalis . Therefore, we exclude it from Aptyxis . Similarly, the Paratethyan P. balteus differs from Aptyxis in its convex whorls the weaker shoulder angulation and the less well-defined axial ribs.
Paleoenvironment. The occurrence at Letkés ( Hungary) points to inner neritic environments with corals ( Kovács & Vicián 2014).
Distribution in Central Paratethys. Badenian (Middle Miocene): Pannonian Basin: Letkés ( Hungary) ( Kovács & Vicián 2023).
| 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.
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Pseudofusus balteus
| Harzhauser, Mathias, Landau, Bernard M. & Vermeij, Geerat J. 2024 |
Aptyxis omphale ( Millet, 1864 )
| Kovacs, Z. & Vician, Z. 2023: 233 |