Itieroptygmatis cylindrata Gründel, Keupp, Lang & Nützel, 2022

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

Itieroptygmatis cylindrata Gründel, Keupp, Lang & Nützel, 2022

Plate 14: figs 12, 13

2022 Itieroptygmatis cylindrata n. sp. – Gründel, Keupp, Lang and Nützel: 207, pl. 18, figs 1–14

Material.

Morphotype 1: 53 specimens (Saal: 48 specimens; locality 1985, above coral stock, level 2 (“ Fundort 1985, über Korallenstock, Sohle 2 ”): 5 specimens. Morphotype 2, Saal: 32 specimens, illustrated specimen SNSB-BSPG 2016 XXI 1929 .

Remarks.

Two morphotypes assigned to this species were described by Gründel et al. (2022). The extremes in this morphological spectrum differ greatly from each another. However, there are also specimens that are difficult to assign to one of the two morphotypes. As outlined previously, it is undecided whether a variable species or two separate species are present, mainly due the poor preservation of the material at hand. A well-preserved juvenile specimen (shell height 24 mm; Plate 14 : fig. 12, 13) of morphotype 2 shows the plait structure: 2 columellar plaits (the adapical one is significantly weaker than the abapical one) and a strong parietal plait. Palatal plaits are not noticeable.

Figures

Plate 14. (1) Eunerinea sp. 1, SNSB BSPG 2021 XV 92, lateral view, height 19 mm. (2, 3) Eunerinea sp. 1, SNSB-BSPG 2016 XXI 1923, lateral and basal view, height 33 mm, width 16 mm. (4, 5) Eunerinea sp. 1, SNSB-BSPG 2016 XXI 1924, (4) lateral view, height 34 mm, (5) last two whorls height 21 mm. (6) Eunerinea sp. 1, SNSB-BSPG 2016 XXI 1925, fragment of a single whorl in lateral view, height 34 mm. (7) Eunerinea sp. 2, SNSB-BSPG 2016 XXI 1926, fragment of a single whorl in lateral view, width 16 mm. (8) Eunerinea sp. 2, SNSB-BSPG 2016 XXI 1927, lateral view, height 38 mm. (9–11) Itieria cabanetiana (d’Orbigny, 1841), SNSB-BSPG 2016 XXI 1928, lateral views, height 67 mm, basal view, width 41 mm. (12, 13) Itieroptygmatis cylindrata Gründel et al., 2022, morphotype 2, SNSB-BSPG 2016 XXI 1929, lateral views, height 24 mm.