Ceritella sp. 1

Gruendel, Joachim, Keupp, Helmut, Lang, Fritz & Nuetzel, Alexander, 2022, Late Jurassic (Upper Kimmeridgian) Heterobranchia (Gastropoda) of the coral-facies of Saal near Kelheim and the viciniy of Nattheim (Germany), Zitteliana 96, pp. 179-221 : 179

Ceritella sp. 1

Plate 4: figs 6-8

Material.

Nine specimens from Saal (collection Lang), one of which is illustrated herein: SNSB-BSPG 2021 XV 7.

Description.

The illustrated specimen is 3.2 mm high. The shell is moderately slender with high, acute spire. The whorls are distinctly broader than high. The sutures are impressed. The whorls have a strongly inclined ramp, separated from whorl face by a spiral cord. The growth lines are strengthened and weakly prosocyrt from ramp to base. The base and aperture are as in Ceritella convexa sp. nov.

Relationships.

The shell of Ceritella convexa sp. nov. is broader than that of Ceritella sp. 1. Ceritella convexa sp. nov. has axial ribs whereas Ceritella sp. 1 lacks ribs. Ceritella lorteti Loriol sensu Cossmann (1895) has a higher last whorl in relation to the spire and its ramp is less pronounced. Ceritella pupoides ( d’Orbigny) sensu Fischer and Weber (1997) and Actaeonina lauretana Guirand and Ogérien. sensu Loriol in Loriol and Bourgeat (1886-1888) have a distinctly stouter shell and a less pronounced ramp. Actaeonina miliola d’Orbigny sensu Loriol in Loriol and Bourgeat (1886-1888) is broader and lacks a ramp entirely.

Figures

Plate 4. (1 - 5) Ceritella convexa sp. nov. (1 - 2) Paratype, SNSB-BSPG 2021 XV 8, Saal (collection Lang), lateral views, height 4.3 mm. (3 - 5) Holotype, SNSB-BSPG 2021 XV 9, Saal (collection Lang); (3 - 4) lateral views, height 3.5 mm; (5) apical view, width 1.8 mm. (6 - 8) Ceritella sp. 1, SNSB-BSPG 2021 XV 7, Saal (collection Lang); (6 - 7) lateral views, height 3.2 mm; (8) apical view, width 1.3 mm.