Leptomaria goldfussi ( Sieberer, 1907 )

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

Leptomaria goldfussi ( Sieberer, 1907)

Plate 1: figs 12–16

2017 Leptomaria goldfussi ( Sieberer, 1907) – Gründel, Keupp and Lang: 177, pl. 2, figs 13–15; pl. 3, figs 1–2 (here more synonymy and chresonymy).

2017 Leptomaria tuberosa sp. nov. – Gründel, Keupp and Lang: 177, pl. 3, figs 3–5.

2017 Leptomaria tuberosa Gründel, Keupp and Lang – Gründel: 27, pl. 3, fig. C.

Material.

12 specimens, SNSB – BSPG 2016 XXI 1616 –1627.

Description.

Shell broadly trochiform, wider than high, with blunt, rounded apex; a specimen is 28 mm high; whorl face of first whorls straight, on late whorl slightly concave adapically and slightly convex abapically; selenizone separates these zones of whorl face; selenizone at about mid-whorl in early whorls, distinctly above mid-whorl in later whorls; earliest recognizable ornament consists of cancellate pattern of weak spiral threads and somewhat strengthened growth lines; spiral threads become stronger forming cords later in ontogeny; ca. 10 cords present on whorl face; growth lines may stay weak throughout ontogeny in some specimens; other specimens have strong, bulgy, prosocline axial ribs that are much broader than their interspaces on adapical portion of whorls; intersections of spiral cords and axial ribs are strongly nodular; subsutural row of nodules strongest; spiral cords strengthened below selenizone, commonly with alternation of strong and weak spiral cords; growth lines in this portion only developed as weak axial ribs; axial ribs crenulate spiral cords at intersections; base anomphalous, flat; transition from whorl face to base at rounded edge without nodes; base covered with numerous spiral cords of somewhat varying strength; strongest spiral cords towards center of base; growth lines on base sickle-shaped, straight near center opisthocyrt towards edge; aperture rounded quadratic, columellar lip somewhat broadened.

Remarks.

Gründel et al. (2017) discussed the possibility that L. tuberosa Gründel, Keupp & Lang, 2017 is a varity of L. goldfussi . The new material corroborated this assumption and L. tuberosa is now considerd to be a synonym. Differences to Leptomaria sp. are explained below. Laevitomaria ? antoniae (Étallon, 1861 in Thurmann and Étallon sensu Gründel et al. 2020 a) has more convex whorls and deeper sutures; it lacks strengthened subsutural axial ribs. Pleurotomaria agassizii Münster, 1844 (in Goldfuss) has distinct subsutural axial ribs and the edge at the transition from whorl face to base bears nodes.

Figures

Plate 1. (1) Patella sp., SNSB – BSPG 2016 XXI 1601, collection O. Neubauer, dorsal view, length 7 mm. (2–4) Scurriopsis cragolis sp. nov. holotype, SNSB – BSPG 2016 XXI 1602, (2–3) lateral and dorsal views, length 16 mm, (4) detail of ornament, height ca. 5.8 mm. (5–8) Scurriopsis sp., SNSB – BSPG 2016 XXI 1606, (5) dorsal view, length 8 mm, (6) detail in dorsal view, width 3.5 mm, (7–8) lateral view and detail of ornament, height 6 mm. (9–10) Pseudorhytidopilus? quadratus sp. nov., holotype, SNSB – BSPG 2016 XXI 1607, dorsal and lateral views, largest diameter 21 mm. (11) Pseudorhytidopilus? quadratus sp. nov., paratype, SNSB – BSPG 2016 XXI 1608, dorsal view, largest diameter 16 mm. (12) Leptomaria goldfussi (Sieberer, 1907), SNSB – BSPG 2016 XXI 1616, lateral view, height 25 mm. (13, 14) Leptomaria goldfussi (Sieberer, 1907), SNSB – BSPG 2016 XXI 1617, early whorls and detail of ornament, (13) height 16.5 mm, (14) height 14 mm. (15, 16) Leptomaria goldfussi (Sieberer, 1907), SNSB – BSPG 2016 XXI 1618, aperture and base, width 24 mm.