Nerinella ornata ( d'Orbigny , 1852)

Gruendel, Joachim, Keupp, Helmut, Lang, Fritz & Nuetzel, Alexander, 2022, Late Jurassic (Upper Kimmeridgian) Heterobranchia (Gastropoda) of the coral-facies of Saal near Kelheim and the viciniy of Nattheim (Germany), Zitteliana 96, pp. 179-221 : 179

Nerinella ornata ( d'Orbigny, 1852)

Plate 15: figs 1-5

*1852 - Nerinea ornata d’Orbigny - d’Orbigny: 135, pl. 274, figs 1-3.

v1881-1884 - Nerinea ornata Orb. - Quenstedt: 528, pl. 205, figs 74, 75.

1997 - Nerinella subtricincta ( d’Orbigny, 1852) - Fischer and Weber: 54, pl. 5, figs 21, 22.

Material.

Two specimens from Nattheim ( Tübingen: collection Quenstedt), one specimen certainly representing this species (SNSB-BSPG 2021 XV 72) and a questionable juvenile specimen from Saal (both collection Lang).

Description.

The specimen illustrated in Plate 15 : figs 1-3 is 33 mm high and that in Plate 15 : fig. 4 is 18 mm high. The shell is very slender and consists of many whorls. The whorls are high with concave whorl face. The most conspicuous sculptural feature is a bulge lacking knobs (or weakly knobby?) forming the periphery which is formed by two neighbouring whorls. The suture is not clearly visible on this bulge. A weak spiral cord is present directly below the bulge followed by two stronger spiral cords in abapical direction. All spiral cords are knobby. Base and aperture are incompletely preserved. At least one columellar and a parietal plait are present. The aperture seemingly has an abapical canal.

Remarks.

Fischer and Weber (1997) designated a neotype for N. ornata and illustrated it (pl. 5, fig. 22). They considered this species to represent a synonym of Nerinella subtricincta d’Orbigny, 1852.

Relationships.

Nerinella elatior d’Orbigny juv. sensu Fischer and Weber (1997) has more concave whorls, only a single strong, knobby spiral cord at mid-whorl and a distinctly weaker one above it. Nerinella chantrei Loriol sensu Cossmann (1898) is similar and has the same ornamentation but differs in having higher whorls, the whorl face is more concave, and besides knobby spiral cords it also has smooth ones. Nerinea satagea Loriol in Loriol and Pellat (1874) has a knobby bulge, the spiral cords on the whorls are of approximately equal strength, and the whorls are higher. Nerinea greppini Loriol, 1889 (in Loriol and Koby 1889-1892) has two knobby and two smooth spiral cords. Nerinea sp. sensu Hudleston (1880) has three approximately equally strong knobby spiral cords and its shell is slenderer. Nerinea punctata Quenstedt sensu Fiebelkorn (1893) has higher and more concave whorls; the knobs on the spiral cords are weaker (due to preservation?). Nerinea subscalaris Münster sensu Schlosser (1882) has a stronger bulge (knobby?), a more concave whorl face and two knobby spiral cords. Nerinella subtricincta ( d’Orbigny) sensu Hägele (1997) has a weaker but knobby bulge and three equally strong knobby spiral cords. Nerinea ornata d’Orbigny sensu Loriol in Loriol and Lambert (1893) is slenderer and has higher whorls and the abapical spiral cord is weakest. Nerinea fasciata Voltz sensu Fiebelkorn (1893) has lower whorls that increase more rapidly in width, and it has more spiral cords.

Figures

Plate 15. (1 - 5) Nerinella ornata (d'Orbigny, 1852). (1 - 3) SNSB-BSPG 2021 XV 72, Saal (collection Lang); (1) lateral view, height 33 mm; (2) detail of ornament, height 10 mm; (3) whorl with plait, height 3 mm. (4) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height 18 mm (original Quenstedt 1881 - 1884, pl. 205, fig. 74). (5) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height ca. 14 mm (original to Quenstedt 1881 - 1884, pl. 205, fig. 75). (6 - 12) Nerinella? subscalaris (Muenster in Goldfuss, 1844). (6 - 7) SNSB-BSPG 2021 XV 63, Nattheim-Rinderberg; (6) lateral view, height 64 mm; (7) last whorls with aperture, height 38 mm. (8) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height ca. 40 mm (original Quenstedt 1881 - 1884, pl. 205, fig. 63). (9) University Tuebingen (collection Quenstedt), Nattheim, lateral view, height ca. 30 mm (original to Quenstedt 1881 - 1884, pl. 205, fig. 64). (10 - 11) Collection University Tuebingen (collection Quenstedt), Nattheim; (10) lateral view, height ca. 38 mm (original to Quenstedt 1881 - 1884, pl. 205, fig. 66); (11) last whorls with aperture, height ca. 20 mm. (12) Collection University Tuebingen (collection Quenstedt), Nattheim, 26 mm, lateral view, height ca. 26 mm (original Quenstedt 1881 - 1884, pl. 205, fig. 73). (13 - 15) Nerinella? sp. 1, SNSB-BSPG 2021 XV 78, Saal (collection Lang); (13) lateral view, height 43 mm; (14) whorl with plaits, width 17 mm; (15) detail of ornament, height 17 mm.