Bythoceratina (Praebythoceratina) sp. 1

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 : 5

Bythoceratina (Praebythoceratina) sp. 1

Fig. 8: 3

Material.

1 C, 8 RV, 9 LV in samples He19-16-27 and Ro19-4-5.

Occurrence.

Upper Aalenian, Murchisonae to Concavum zones; SW Germany.

Description.

A species of Praebythoceratina which is distinguished by the combination of the following features: an U-shaped lobe with an irregularly reticulate spine in the ventro-central area. Its anterior branch is strongly convex and irregularly reticulate, with dominant subvertical ridges. The posterior branch is broad and gently arched and covered with irregular pores. Along the anterior margin there is a pronounced bulge, which is also irregularly reticulate.

Figures

Figure 8. (1) Cytherella apostolescui Ainsworth, SMNS 70521 / 33, RV, L: 0.793 mm; sample He 19 - 27. (2) Cytherelloidea cf. catenulata (Jones and Sherborn), SMNS 70521 / 34, LV, L: 0.438 mm; sample He 19 - 17. (3) Bythoceratina (Praebyth.) sp. 1, SMNS 70521 / 35, RV, L: 0.416 mm; sample He 19 - 18. (4) Procytherura cf. serangodes Ballent and Whatley, SMNS 70521 / 36, C, right view, L: 0.331 mm; sample He 19 - 15; (5) Praeschuleridea punctulata (Plumhoff), SMNS 70521 / 37, C, right view, L: 0.606 mm; sample He 19 - 15. (6) Praeschuleridea sp. A Ainsworth, SMNS 70521 / 38, LV, L: 0.733 mm; sample He 19 - 17; (7) Pleurocythere sp. 1, SMNS 70521 / 39, RV, L: 0.585 mm; sample He 19 - 16. (8) Homocytheridea sp. 1, SMNS 70521 / 40, LV, L: 0.707 mm; He 19 - 15. (9) Homocytheridea sp. 2, SMNS 70521 / 41, RV, L: 750 mm; sample Mue 19 - 1; (10) Progonocythere scutula Franz et al., SMNS 70521 / 42, RV, L: 0.464 mm; sample He 19 - 17; (11) Kinkelinella (Kink.) fischeri Malz, SMNS 70521 / 43, C, left view, L: 0.412 mm; sample Lin 18 - 4. (12) Kinkelinella sp. 2, SMNS 70521 / 44, RV, L: 0.444 mm; sample He 19 - 17; (13) Ektyphocythere aff. anterocosta Boomer, SMNS 70521 / 45, RV, L: 0.281 mm; sample He 19 - 14; (14) Gen. et sp. 9 Tesakova, SMNS 70521 / 46, RV, L: 0.296 mm; He 19 - 17; (15) Gen. et sp. indet. 9, SMNS 70521 / 47, LV, L: 0.235 mm; sample He 19 - 18. (16) Gen. et sp. indet. 12, SMNS 70521 / 48, LV, L: 0.306 mm; sample He 19 - 16. Achdorf Formation (13) Opalinum Zone, (" Comptum " Subzone), (4 - 5, 7 - 8, 16) Murchisonae Zone, (2, 6, 10, 12, 14) Bradfordensis Zone (Bradfordensis Subzone), (3, 15) Bradfordensis Zone (Gigantea Subzone), (1, 7) Concavum Zone. Scale bars (if not indicated otherwise): 20 μm.