Undetermined

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

Nododelphinulidae? gen. et sp. indet.

Plate 4: figs 8–11

Material.

1 specimen, SNSB – BSPG 2016 XXI 1737 .

Description.

Shell broadly turbiniform, with gradate spire; specimen 17 mm wide; earliest visible ornament consists of two edges, one at about mid-whorl, the other suprasutural; whorl face above adapical edge forms oblique ramp, approximately vertical below edge; nodular spiral cord in subsutural position; between this cord and adapical edge, first one, then a second spiral cord appear on ramp and also on whorl face between edges; whorl face ornamented with widely spaced, bulging axial ribs that continue onto center of base; axial ribs approximately orthocline on whorl face and distinctly opisthocline on base; adapical edge with numerous small nodes in early whorls but fewer and larger nodes on last whorl; same trend on abapical edge, but not as distinct; nodes spirally elongated, tapering in abapertural direction with narrow beginning and trumpet-like widening in apertural direction; spoon-like pits at apertural end of nodes, which terminate abruptly, immediately followed by narrow beginning of next node; widened spoon-like ending of elongate nodes lies at intersection of axial ribs and spiral cords; base flatly convex with angular transition to whorl face; base covered with nodular spiral cords; aperture not preserved.

Remarks.

The morphology of the spirally elongated nodes is to our knowledge unique; we know of no other example from the literature.

Figures

Plate 4. (1) Heliacanthus sp. 1, SNSB – BSPG 2016 XXI 1726, basal view, width 12 mm. (2–6) Heliacanthus? sp. 2, SNSB – BSPG 2016 XXI 1730, (2, 5) lateral and apical view, width 20 mm, (3) apex in lateral view, height 11 mm, (4) shell detail in lateral view, height 11 mm, (6) detail apical view, width 15 mm. (7) Heliacanthus? sp. 2, SNSB – BSPG 2016 XXI 1731, apertural view, height of aperture 19 mm. (8–11) Nododelphinulidae? gen. and sp. indet., SNSB – BSPG 2016 XXI 1731, (8, 10) lateral and lapical views, width of specimen 17 mm, (9) apex in lateral view, height 10 mm, (11) detail of base, width 14 mm. (12, 13) Creniturbo gibbosus sp. nov. (specimen lost), collection Lang, apical and lateral views. (14, 15) Creniturbo gibbosus sp. nov., holotype, SNSB – BSPG 2016 XXI 1738, (collection Lang), oblique basal and lateral views, width 6.5 mm.