Eucytherura sp. 5 Franz et al., 2018

Wannenmacher, Norbert, Dietze, Volker, Franz, Matthias & Schweigert, Guenter, 2021, New records of ostracods and ammonites from the Aalenian (mainly Concavum Zone) of the Zollernalb (Swabian Alb, SW Germany), Zitteliana 95, pp. 1-55 : 9

Eucytherura sp. 5 Franz et al., 2018

Fig. 9: 6

Material.

1 C in sample He19-19; 5 RV, 1 LV from the Geisingen clay pit.

Occurrence.

Lower to Upper Aalenian, Opalinum to Bradfordensis zones; SW Germany.

Description.

Very small, subovoidal. Anterior margin asymmetrically rounded with extremity below mid-height; posterior margin pointed, apex above mid-height. Posterior cardinal angle rounded; anterior cardinal angle pronounced in both valves. Dorsal margin slightly convex, ventral margin convex. Greatest height at anterior cardinal angle; greatest length above mid-height. Shell surface irregularly and coarsely reticulated. The most striking feature is the gently undulating surface with slight anterodorsal, middorsal and anteroventral depressions. The eye-tubercle is fused with a short, indistinct frontal rib. A short bulge-like rib is located at the posterior cardinal angle. Internal details not observed.

Figures

Figure 9. (1) Cytherelloidea lordi Ainsworth, SMNS 70521 / 49, C, right view, L: 0.688 mm; sample He 19 - 19. (2) Bairdiacypris triangularis Ainsworth, SMNS 70521 / 50, C, right view, L: 0.309 mm; sample He 19 - 19. (3) Macrocypris aequabilis Oertli, SMNS 70521 / 51, C, left view, L: 0.349 mm; sample He 19 - 21. (4) Eucytherura cf. parairregularis Brand, SMNS 70521 / 52, C, right view, L: 0.281 mm; sample He 19 - 19; (5) Eucytherura cf. yunga Ballent and Whatley, SMNS 70521 / 53, RV, L: 0.304 mm; sample He 19 - 27. (6) Eucytherura sp. 5 Franz, SMNS 70521 / 54, RV, L: 0.295 mm; sample G 11 Fr; (7) Eucytherura sp. 11 Franz, SMNS 70521 / 55, RV, L: 0.327 mm; sample He 19 - 25. (8) Balowella catena (Franz et al.), SMNS 70521 / 56, RV, L: 0.308 mm; sample He 19 - 24. (9) Praeschuleridea ornata (Bate), SMNS 70521 / 57, RV, L: 0.578 mm; sample He 19 - 21; (10, 11)? Southcavea sp., (10) SMNS 70521 / 58, LV, L: 0.315 mm; (11) SMNS 70521 / 59, RV, L: 0.368 mm; sample He 19 - 24; (12) Pleurocythere kirtonensis Bate, SMNS 70521 / 60, RV, L: 0.597 mm; sample He 19 - 18. (13) Acrocythere aff. pumila Plumhoff, SMNS 70521 / 61, LV, L: 0.406 mm; sample He 19 - 27; (6) Opalinuston Formation, Lower Aalenian, Opalinum Zone, (1 - 5, 7 - 13) Achdorf Formation, Upper Aalenian (1 - 4, 9, 12) Bradfordensis Zone (Gigantea Subzone), (5, 7 - 8, 10 - 11, 13) Concavum Zone. Scale bars (if not indicated otherwise): 20 μm.