Heliacanthus sp. 1

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

Heliacanthus sp. 1

Plate 3 : figs 14–15, Plate 4: Fig. 1

Material.

4 specimens, SNSB – BSPG 2016 XXI 1726 –1729.

Description.

Shell broadly turbiniform with gradate spire; largest specimen 20 mm wide; first recognizable sculpture is a distinct edge situated high on whorl face which separates an approximately horizontal ramp from a vertical abapical part; subsutural spiral cord; two spiral cords appear on either side of edge; orthocline, bulging, blurred axial ribs run from suture to suture; nodules at intersections of axial ribs with subsutural spiral cord and edge; nodes have a pit in apertural direction; base phaneromphalous, slightly convex with angular transition to whorl face; base is covered with 5–6 relatively weak spiral cords in the outer area and three strong nodular spiral ribs near center; all weaker spiral cords are finely crenulated; axial ribs very weak on base; aperture not preserved.

Remarks.

? Nododelphinula sp. sensu Hägele (1997) is smaller, lacks clear axial ribs, the bordering spiral cord at the transition to the base lacks nodes, on the base there is only a hump-shaped spiral cord that surrounds the umbilicus. Heliacanthus epulus (d’Orbigny) sensu Hägele (1997) has smaller and more numerous nodes on the edge, while it lacks a reinforced spiral cord with larger nodes at the transition to the base. Metriomphalus (Metriacanthus) rugosus (Buv.) sensu Fischer and Weber (1997) lacks axial ribs, the nodes on the edge at the transition to the base are larger and less numerous, and its base lacks strong and nodular spiral cords.

Figures

Plate 3. (1) Caryomphalus globatus (Buvignier, 1843), SNSB – BSPG 2016 XXI 1713, lateral view, width 15 mm. (2, 3) Caryomphalus sp., cf. concavus Gründel, Keupp & Lang, 2017, SNSB – BSPG 2017 XXI 1717, lateral and basal views, height 14 mm, width 12 mm. (4) Proconulus? sp. 1 sensu Gründel, Keupp and Lang (2017), SNSB – BSPG 2016 XXI 1718, lateral and basal views, height 11 mm. (5–7) Nododelphinula oblonga sp. nov., holotype, SNSB – BSPG 2016 XXI 1721, lateral views, apertural and abapertural, basal view, width 26 mm. (8–9) Nododelphinula oblonga sp. nov., paratype, SNSB – BSPG 2016 XXI 1930, collection Lang, shell in lateral and dorsal view, width 27 mm. (10–12) Serrettella gerberi (Gründel, Keupp & Lang, 2017), SNSB – BSPG 2016 XXI 1722, lateral, basal views and aperture, width 13 mm. (13) Serrettella gerberi (Gründel, Keupp & Lang, 2017), locality 1985, above coral stock, level 2, SNSB – BSPG 2016 XXI 1723, lateral view, width 9.5 mm. (14, 15) Heliacanthus sp. 1, SNSB – BSPG 2016 XXI 1726, abapertural and apertural lateral views, height 12 mm.

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.