Fedosovia fuchsi Harzhauser & Landau 2021, nov. comb
Creators: name: Harzhauser, Mathias
name: Landau, Bernard
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Neogastropoda
Costellariidae
Fedosovia
Fedosovia fuchsi

description: Fedosovia fuchsi (Hoernes & Auinger, 1880) nov. comb,
Figs 4G, 12A 1 –A 2, B 1 –B 2, C 1 –C 2, D
[Callithea] Fuchsi nov. form.—Hoernes 1880: 125 [nomen nudum].
* Mitra (Callithea) Fuchsi nov. form.— Hoernes & Auinger 1880: 87, pl. 10, figs 12–14.
Type material. Lectotype (designated herein): NHMW 1857 /0024/0012, Lăpugiu de Sus (Romania), SL: 13.8 mm, MD: 5.0 mm, illustrated in Hoernes & Auinger (1880, pl. 10, figs 13a–c), figs 4G, 12B 1 –B 2. Paralectotypes: NHMW 1999 z0076/0003, Jaroměřice nad Rokytnou (Czech Republic), SL: 14.7 mm, MD: 5.4 mm, illustrated in Hoernes & Auinger (1880, pl. 10, figs 12a–c), figs 12A 1 –A 2; NHMW 2020 /0086/0001, Lăpugiu de Sus (Romania), SL: 15.1 mm, MD: 5.2 mm, illustrated in Hoernes & Auinger (1880, pl. 10, figs 14a–c); NHMW 2016 /0177/0878, Lăpugiu de Sus (Romania), SL: 20.8 mm, MD: 7.3 mm, figs 12C 1 –C 2; NHMW 2016 /0177/0878, Lăpugiu de Sus (Romania), SL: 20.0 mm, MD: 7.5 mm, fig. 12D.
Revised description. Shell large, moderately broad to moderately slender fusiform. Protoconch (fig. 4G) paucispiral, low conical, 1.7 smooth, weakly convex whorls (height: 540 μm, diameter: 560 μm). Teleoconch boundary marked by beginning of axial sculpture. Teleoconch of seven whorls, separated by impressed suture. First teleoconch whorl convex, with about ten blunt, convex, weakly opisthocline axial ribs, separated by narrow interspaces. Axial ribs bearing three spiral rows of nodules; nodules of middle row with tiny spines on first teleoconch whorl. Additional spiral rows intercalated on subsequent whorls. Six spiral rows on penultimate whorl, number may rise to eight by bifurcation. Axial and spiral interspaces very narrow, resulting in densely spaced, pillow-like, subquadrate nodes. Second to third teleoconch whorls weakly angulated slightly above mid-whorl. Later whorls straight-sided or weakly convex, with periphery at or slightly above abapical suture. Last whorl weakly convex to straight-sided, strongly constricted. Aperture ovoid, moderately narrow to wide, with narrow anal sinus. Columellar callus narrow, weakly delimited, bearing three columellar folds; adapical two folds very prominent. Outer lip thin, abapically contracting, no lirae inside aperture. Siphonal canal moderately long, narrow, straight or slightly bent to the left, with shallow siphonal notch.
Shell measurements and ratios. SL: 13.8–20.8 mm, MD: 5.0– 7.5 mm; AA: 38–43°, SL/MD: 2.6–2.7, AL/AW: 3.8–4.3, AH/S: 2.2–2.8.
Discussion. This species is unique within the Paratethyan Costellariidae due to its conspicuous sculpture of densely spaced nodules. Fedosovia zibinica (Toldo, 1889), from the late Miocene of Montegibbio (Italy) is a closely related species, but differs in its strongly convex whorls (see holotype in Davoli 2000, pl. 3, figs 18a–b).
Pusia textilosa Bellardi, 1888, from the early Miocene of Italy, is slightly reminiscent of the Paratethyan species concerning sculpture, but differs clearly in its gradate spire and short siphonal canal (see Ferrero-Mortara et al. 1981, pl. 53, figs 10a–b).
Palaeoenvironment. Unknown; most probably from middle neritic depositional environments with pelitic bottom (based on sediment from the aperture).
Distribution in Central Paratethys. Badenian (middle Miocene): Carpathian Foreland Basin: Jaroměřice nad Rokytnou (Czech Republic); Făget Basin: Lăpugiu de Sus (Romania).
Genus Pusia Swainson, 1840
Type species. Mitra microzonias Lamarck, 1811, by monotypy.
Description. “ Shell small, fusiform to broadly fusiform or ovate, last adult whorl 64–74% of shell height. Protoconch multispiral, narrowly conical, with three or more glossy whorls. Suture distinct, impressed. Sculpture of dense, rounded, axial ribs on early spire whorls (sometimes absent), turning into broad and low folds on last teleoconch whorls; spiral sculpture of fine regular grooves, pronounced in interstices between axials. Shell base sculptured with several broad and flattenned, somewhat gemmate, spiral cords. Siphonal canal short or very short, stout, bearing several strong oblique cords. Aperture narrow, elongate, its outer lip lirate within. Inner apertural lip with three or four strong columellar folds, adapicalmost fold strongest ” (Fedosov et al., 2017: 597).
Key to Paratethyan Pusia species:
1. Axial sculpture weakening abapically, subobsolete on last whorl................................................ 2 - Axial sculpture persisting onto last whorl.................................................................. 3 2. Shell broadly fusiform....................................................................... P. avellanella - Shell narrowly fusiform.................................................................. P. pseudorecticosta 3. Shell narrowly fusiform, outer lip smooth within................................... P. falsitranssylvanic a nov. nom. - Shell broadly fusiform.......................................................................... ………..4 4. Spiral sculpture absent, except siphonal fasciole............................................................. 5 - Spiral sculpture of fine spirals........................................................................... 6 5. Axials close-set, opsithocline............................................................. P. confunda nov. sp. - Axials close-set, orthocline................................................................ P. paraleucozona - Axials widely-set, orthocline..................................................................... P. vexans 6. Spirals over entire surface.............................................................................. 7 - Spirals restricted to subsutural area, shell broadly fusiform............................................ P. moravica 7. Shell fusiform, relatively squat.................................................................... P. brevior - Shell elongate fusiform, tall spired................................................................ P. schafferi
Discussion. The species grouped herein in Pusia are somewhat heterogeneous. While Pusia avellanella and Pusia paraleucozona fit well in the genus as defined by Fedosov et al. (2017),
Pusia falsitranssylvanica and Pusia confunda are atypical due to their moderately high orthoconoid spires and distinct, crested (rather than low and rounded) axial ribs. Currently, no genus is available to place these species and provisionally we keep them in Pusia.
description: Published as part of Harzhauser, Mathias & Landau, Bernard, 2021, An overlooked diversity-the Costellariidae (Gastropoda: Neogastropoda) of the Miocene Paratethys Sea, pp. 1-70 in Zootaxa 4982 (1) on pages 35-36, DOI: 10.11646/zootaxa.4982.1.1, http://zenodo.org/record/4921842