Jaton ampistus (De Gregorio, 1885a)

Harzhauser, Mathias, Landau, Bernard M. & Merle, Didier, 2025, The Muricidae (Gastropoda, Muricoidea) of the Miocene Central Paratethys Sea (Haustrinae, Muricinae, Ocenebrinae, Pagodulinae, Typhinae, Muricidae incertae sedis), Zootaxa 5572 (1), pp. 1-162 : 97-99

Jaton ampistus (De Gregorio, 1885a)

Figs 47 , 48A 1 –A 3

[ Murex ] latilabris Bell. et Micht. — Hörnes 1848: 18 [non Purpurellus latilabris (Bellardi & Michelotti, 1841) ].

Murex latilabris Bell. et Micht. —Hörnes 1853: 247, pl. 25, figs 11a–b [non Purpurellus latilabris (Bellardi & Michelotti, 1841) ].

* Murex (Timbellus) ampistus De Greg. —De Gregorio 1885a: 276 [pro Murex latilabris sensu Hörnes 1853: 247 , pl. 26, fig. 11].

Murex (Pteronotus) latilabris Bell. et Michti. —Hoernes & Auinger 1885: 203 [non Purpurellus latilabris (Bellardi & Michelotti, 1841) ].

Murex (Pterynotus) latilabris Bellardi & Michelotti, 1840 — Strausz 1966: 261, pl. 55, figs 5 – 10 [non Purpurellus latilabris (Bellardi & Michelotti, 1841) ].

Pteropurpura (Purpurellus) latilabris (Bellardi et Michelotti, 1841) — Stojaspal 1978: 335 [non Purpurellus latilabris (Bellardi & Michelotti, 1841) ].

Jaton ampistus (De Gregorio, 1885) — Landau et al. 2007: 37, pl. 5, fig. 6.

non Pterynotus (Pterynotus) latilabris ( Bellardi & Michelotti, 1840) — Atanacković 1985: 139, pl. 31, figs 4 –6 [= Ocenebra sp. ].

Type material. Holotype: NHMW 1853 /0003/0114, SL: 43.0 mm, MD: 23.6 mm, Gainfarn ( Austria), illustrated in Hörnes (1853: pl. 25, figs 11a–b), Figs 48A 1 –A 3 .

Revised description. Large, solid, fusiform, trivaricate shell with low spire; apical angle 70°. Protoconch unknown. Teleoconch of up to five whorls. Suture moderately incised, moderately undulating. Early teleoconch whorl with broad, almost straight-sided subsutural ramp; shoulder placed below mid-whorl. Sculpture of three prominent varices with short open spines developed on shoulder, and one very weak intervarical rib. Spiral sculpture weak. Several delicate cords on subsutural ramp separated by narrow interspaces; P1 more prominent. Last whorl attaining 78% of total height; broad moderately steep subsutural ramp, distinct shoulder, moderately convex periphery, strongly constricted below. Sculpture of three wide, weakly foliaceous varices with indistinct intervarical rib. Spiral sculpture on subsutural ramp of nine subequal cords, comprising adis, IP, abis and tertiary cords. Primary cords narrow, widely spaced; P1, P2, P6, ADP, MP and ABP weak, P3, P5 slightly more prominent. P5 marking slight basal angulation. Secondary cords s1–s2 delicate, adjoined by granulose tertiary threads on either side. About five threads in interspaces between ADP, MP and ABP. Fasciole narrow, delimiting very broad, shallow pseudoumbilicus. Aperture small, ovate; outer lip strongly thickened, smooth within.Anal canal indistinct; siphonal canal very long, fused throughout, weakly bent to the right. Columella moderately excavated, smooth. Columellar callus forming broad, sharply delimited, weakly erect rim.

Discussion. This species was placed in Jaton by Landau et al. (2007: 37) and Merle et al. (2011: 143), which is followed herein. Jaton sowerbyi ( Michelotti, 1841) , which is another Jaton species occurring in the Paratethys Sea, differs in its higher spire, deeply incised suture, larger aperture and shorter siphonal canal. Jaton dufrenoyi ( Grateloup, 1845) , from the Burdigalian of Saucats and Saint-Paul-lès-Dax in the northeastern Atlantic and the Langhian of Montpeyroux ( France) in the Proto-Mediterranean Sea, differs in its higher spire and the much more prominent and broader primary cords (see Cossmann & Peyrot 1924; pl. 13, figs 29–30; Goret & Pons 2013: text-fig. 8, pl. 4, figs 4–6).

Paleoenvironment. Shallow marine, inner neritic. The occurrence at Gainfarn might suggest a preference for seagrass environments (Zuschin et al. 2009).

Distribution in Central Paratethys. Badenian (Middle Miocene): Vienna Basin: Gainfarn, ( Austria) (Hoernes & Auinger 1885); Pannonian Basin: Letkés ( Hungary) ( Strausz 1966).

Figures

FIGURE 1. Cord diagrams and apertural features for Haustrinae [Haustrum? pyrulatum (Hoernes & Auinger, 1882)] and Muricinae [Bolinus gapus (De Gregorio, 1885a), Bolinus partschi (Hörnes, 1853), Chicoreus (Triplex) aquitanicus (Grateloup, 1833), Chicoreus (Triplex) hirmetzli (Kovács, 2018), Chicoreus (Triplex) notatus (Eichwald, 1830). Hexaplex (Trunculariopsis) trunculoides (Pusch, 1837), Hexaplex (Trunculariopsis) esplus (De Gregorio, 1885a), Hexaplex(Trunculariopsis) subasperrimus (d’Orbigny, 1852), Promurex spinicosta (Bronn, 1831), Exquisitor graniferus (Michelotti, 1841)].

FIGURE 3. Bolinus gapus (De Gregorio, 1885a). A1–A3. NHMW 1847/0046/0030, Szob (Hungary). B1–B3. paralectotype, NHMW 1860/0015/1270, Grund (Austria). C1–C3. NHMW1869/0001/0280, Grund (Austria). D1–D3. lectotype, NHMW 1856/0050/0122, Gainfarn (Austria).

FIGURE 47. Cord diagrams and apertural features of Ocenebrinae [Jaton ampistus (De Gregorio, 1885a), Jaton sowerbyi (Michelotti, 1841), Pteropurpura polonica (Pusch, 1836), Pterynopsis badensis (Nyst, 1881)].

FIGURE 48. Jaton ampistus (De Gregorio, 1885a). A1–A3. holotype, NHMW 1853/0003/0114, Gainfarn (Austria).