Eucytherura sp. 3 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. 3 Franz et al., 2018

Fig. 7: 4

Material.

25 C, 4 RV, 4 LV in samples He19-6-18 and from the Geisingen clay pit.

Occurrence.

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

Description.

Very small, subrectangular. Left valve slightly larger than right with dorsal overlap. Anterior margin rounded with extremity slightly below mid-height; posterior margin pointed in right and bluntly rounded in left valve, apex above mid-height. Posterior cardinal angle rounded; anterior cardinal angle pronounced in both valves, slightly more rounded in right valve. Dorsal margin straight in right valve and slightly convex in left valve. Greatest height at anterior cardinal angle; greatest length above mid-height. Shell surface regularly reticulate with rounded meshes of uniform size. Hemispherical eye-tubercle well developed. Starting from the eye-tubercle, a fine frontal rib, straight in the left valve, convex in the right valve, runs parallel to the anterodorsal margin. A second rib runs subvertically from the eye-tubercle and then bends mid-anteriorly to the anterior margin. A ventral rib starts posteroventrally and ends midventrally with its anterior end slightly ascending towards the ventromedian side. A short subvertical ridge is located at the posterior cardinal angle. Internal details not observed.

Figures

Figure 7. (1) Eucytherura plumhoffi Tesakova, SMNS 70521 / 17, C, left view, L: 0.309 mm; sample He 19 - 7. (2) Eucytherura transversiplicata (Bate and Coleman), SMNS 70521 / 18, LV, L: 0.316 mm; sample He 19 - 3. (3) Eucytherura sp. 1 Franz et al., SMNS 70521 / 19, RV, L: 0.320 mm; sample He 19 - 12. (4) Eucytherura sp. 3 Franz, SMNS 70521 / 20, C, right view, L: 0.300 mm; sample He 19 - 18; (5) Aphelocythere dilgeri Franz et al., SMNS 70521 / 21, RV, L: 0.460 mm; sample He 19 - 18. (6) Aphelocythere pygmaea Plumhoff, SMNS 70521 / 22, C, right view, L: 0.343 mm; sample He 19 - 12; (7)? Aphelocythere sp. 1, SMNS 70423 / 119, C, right view, L: 0.308 mm; sample G 08 Fr; (8)? Pleurocythere sp., SMNS 70521 / 23, LV, L: 0.354 mm; sample He 19 - 1. (9) Acrocythere pumila Plumhoff, SMNS 70521 / 24, LV, L: 0.343 mm; He 19 - 12. (10) Praeschuleridea ventriosa (Fischer in Plumhoff), SMNS 70521 / 25, LV, L: 0.650 mm; sample Mue 19 - 1; (11) Kinkelinella (Kink.) sermoisensis (Apostolescu), SMNS 70521 / 26, LV, L: 0.656 mm; sample He 19 - 9; (12) aff. Ostracode A Ballent, SMNS 70521 / 27, RV, L: 0.290 mm; sample He 19 - 2. (13) Gen. et sp. indet. 3, Franz et al., SMNS 70521 / 28, RV, L: 0.342 mm; sample He 19 - 5; (14) Gen. et sp. indet. 5 Franz et al., SMNS 70521 / 29, RV, L: 0.310 mm; He 19 - 18; (15) Gen. et sp. indet. 8 Franz, SMNS 70521 / 30, RV, L: 0.280 mm; sample He 19 - 12. (16) Gen. et sp. indet. 10, SMNS 70521 / 31, LV, L: 0.300 mm; sample He 19 - 12. (17) Gen. et sp. indet. 11, SMNS 70521 / 32, LV, L: 0.324 mm; sample He 19 - 8. (1 - 3, 6 - 8, 10 - 12, 15 - 17) Opalinuston Formation, Lower Aalenian, Opalinum Zone; (4 - 5, 9, 14) Achdorf Formation, Upper Aalenian, (4 - 5, 14) Bradfordensis Zone (Gigantea Subzone), (9) Concavum Zone. Scale bars (if not indicated otherwise): 20 μm.