Hayamiella? sp.

Gründel, Joachim & Nützel, Alexander, 2024, Late Jurassic (Upper Kimmeridgian) gastropods from Saal near Kelheim (Germany, Bavaria), Zitteliana 98, pp. 19-72 : 19-72

Hayamiella? sp.

Plate 7: figs 11, 12

1997 Neritopsis sp. 1 – Hägele: 58, fig. p. 58, upper left, pl. 7, fig. 5.

Material.

2 specimens, illustrated specimen SNSB – BSPG 2016 XXI 1778 .

Description.

Shell neritiform, low-spired, apex almost flat, barely protruding last whorl in lateral view; larger shell 11 mm wide; wide ramp is inclined towards whorl axis; ornament of last whorl consists of 5 strong spiral cords approximately equally spaced; approximately 10 strong, widely spaced axial ribs run from adapical suture to center of base; intersections of strong spiral cords and axial ribs nodular; several weak spiral cords on ramp and between two strong spiral cords of rest of shell; intersections these weak spiral cords with axial ribs lack nodes; aperture unknown.

Remarks.

Neritopsis cottaldina d’Orbigny, 1852 as illustrated by Loriol in Loriol and Bourgeat (1886–1888, figs 3–4, non figs 1–2, 5) resembles Hayamiella ? sp. 1, but has a distinctly elevated spire and more axial ribs per whorl.

Figures

Plate 7. (1, 2) Wallowiella (Plicaropsis) cancellata (Stahl, 1824) (juvenile), SNSB – BSPG 2016 XXI 1774, abapertural and apertural views, width 10 mm. (3, 4) Wallowiella (Plicaropsis) compacta Gründel, Keupp & Lang, 2015, SNSB – BSPG 2016 XXI 1775 (collection Lang), lateral and axial views, width 17 mm. (5–7) Wallowiella (Plicaropsis) compacta Gründel, Keupp & Lang, 2015, c SNSB – BSPG 2016 XXI 1776, abapertural and apertural views, width 18 mm. (8–10) Hayamiella subvaricosa (Brösamlen, 1909), SNSB – BSPG 2016 XXI 1777, abapertural, apertural and apical views, width 18 mm. (11, 12) Hayamiella? sp., SNSB – BSPG 2016 XXI 1778, abapertural and apical views, width 11 mm.