Leptomaria phacoides Zittel, 1873

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

Leptomaria phacoides Zittel, 1873

Plate 2: figs 3–5

? 1844 Trochus iurensis Hartmann – Goldfuss: 57, pl. 180, fig. 12.

* 1873 Pleurotomaria (Leptomaria) phacoides n. sp. – Zittel: 335, pl. 50, fig. 1.

? 1907 Leptomaria umbilicata n. sp. – Sieberer: 61, pl. 5, fig. 9.

1997 Leptomaria phacoides Zittel – Hägele: 33, pl. 5, fig. 1, fig. p. 33 upper middle.

2013 Leptomaria phacoides Zittel – Monari and Gatto: 821, fig. 8 Q.

Material.

1 specimen SNSB – BSPG 2016 XXI 1629 and 1 cast of an impression SNSB – BSPG 2016 XXI 1630 (the impression itself is lacking).

Description.

Shell low trochiform, with low whorls; specimen 41 mm wide; suture shallow;

selenizone indistinct apparently at mid-whorl on last whorl, and suprasutural on spire whorls with a bulge below it; whorls with faint remains of spiral ornamentation; base flat, demarcated from whorl face by rounded edge, widely phaneromphalous; base without visible ornamentation except for indistinct growth lines; aperture not preserved.

Remarks.

Leptomaria chryseis Laube sensu Gründel (2012) and Monari and Gatto (2013) has an ornament of spiral and axial ribs on the early teleoconch whorls, its whorls are more convex and the sutures are more distinct. Pleurotomaria onion d’Orbigny sensu Loriol in Loriol and Bourgeat (1886–1888) lacks ornamentation and its umbilicus is wider. Pleurotomaria cfr. philea d’Orbigny sensu Schlosser (1882) has more convex whorls, deeper sutures, and lacks an abapical bulge and furrow. Pleurotomaria umbilicata Sieberer, 1907 is maybe identical with Leptomaria phacoides but has a weak cancellate ornament of spiral cords and axial ribs.

Figures

Plate 2. (1, 2) Leptomaria sp., SNSB – BSPG 2016 XXI 1628, lateral and basal views, width 30 mm. (3–5) Leptomaria phacoides Zittel, 1873, SNSB – BSPG 2016 XXI 1629, lateral, apical and basal views, width 41 mm. (6) Leptomaria phacoides Zittel, 1873?, SNSB – BSPG 2016 XXI 1631, lateral view, height 22 mm. (7) Rimulopsis danuviensis sp. nov., holotype, SNSB – BSPG 2016 XXI 1653, collection Neubauer, lateral view, height 9 mm. (8) Rimulopsis danuviensis sp. nov., paratype, SNSB – BSPG 2016 XXI 1654, collection Neubauer, anterior view, height 7 mm. (9–11) Asperilla longispina (Rolle, 1861), SNSB – BSPG 2016 XXI 1661, lateral, apical and basal views, width including spines 24 mm. (12, 13) Falsataphrus? valfinense Loriol, in Loriol and Bourgeat (1886–1888), SNSB – BSPG 2016 XXI 1696, apical and lateral views, width 12 mm. (14, 15) Caryomphalus globatus (Buvignier, 1843), SNSB – BSPG 2016 XXI 1713, basal and lateral views, width 15 mm.